[pt] O conhecimento do comportamento de solos residuais é de grande importância para projetos geotécnicos no Brasil e, em particular, na região do Rio de Janeiro, tendo em vista que o clima tropical e as características geológicas favorecem a ocorrência de mantos residuais de grande espessura. O presente trabalho trata do estudo do comportamento tensão-deformação de um solo residual proveniente de um perfil de alteração de rocha gnáissica do maciço da Tijuca, Rio de Janeiro. Como os solos residuais gnáissicos preservam as foliações herdadas da rocha matriz, investigou-se em particular a relevância de se considerar a ocorrência de anisotropia nas características de resistência e deformabilidade destes solos. No estudo foi utilizado o equipamento triaxial cúbico desenvolvido na PUC-Rio. Este equipamento possibilita o controle independente das três tensões principais, sendo mais adequado para a reprodução das trajetórias de tensões tridimensionais, usualmente associadas com obras geotécnicas no campo, e em particular, para estudos sobre as características de anisotropia de solos. O programa experimental constou de ensaios de compressão axial e hidrostática, sob condições drenadas de carregamento, utilizando o equipamento triaxial cúbico. Foram realizados também ensaios oedométricos convencionais, de modo a se obter as características de compressibilidade do solo. Foram moldados corpos de prova a partir de blocos indeformados, paralelos e perpendiculares à foliação observada no solo, o que possibilitou a análise dos resultados para direções distintas de carregamento. Para efeito de comparação sobre a relevância do arranjo estrutural dos grãos do solo, foram ensaiados também corpos de prova compactados dos mesmos materiais. A análise dos resultados permitiu a obtenção dos módulos de deformabilidade e dos parâmetros de resistência do solo residual. Em particular, foram verificados os efeitos da direção de carregamento dos corpos de prova, do nível das tensões de confinamento, do grau de intemperismo, do arranjo estrutural dos grãos e dos efeitos do grau de saturação. Pode-se concluir que os solos estudados não apresentaram efeitos marcantes de anisotropia nas características de resistência. No entanto, quanto à deformabilidade, pode-se considerar que o solo residual jovem apresentou características anisotrópicas. / [en] The knowledge of the mechanical behaviour of residual soils is of great importance in geotechnical projects, because of its abundance in tropical regions, such as Brazil and particularly in the area of Rio de Janeiro. The present work presents a study on the fundamental stress-strain behaviour of a residual soil resulting from a profile of a gneiss rock in Rio de Janeiro. As the gneiss residual soils preservethe bedding planes from the parent rock, the relevance of considering anisotropy in the stress- strain characteristics of these soils was investigated. The cubic triaxial equipment developed at PUC-Rio was used in this research. This equipment allows the independent control of the three principal stresses, allowing the reprodution of three-dimensional stress paths, usually associated with geotechnical works in the field. The experimental program consisted of axial and hidrostatic tests, under drained loading conditions, using the cubic triaxial equipment. One- dimensional oedometer tests were also performed, in order to obtain the compressibility characteristics of the residual soil. Undisturbed specimens were prepared with the bedding planes parallel or perpendicular to the loading direction. Analysis of the test results showed the effects of load direction, confining stress level, weathering degree, structural soil fabric and saturation degree. It may be concluded that the gneiss residual soils which were selected for this research do not present significant effects of anisotropy in the strength characteristics. In the stress- strain characteristics, however, it may be concluded that the young residual soil showed effects of anisotropy. / [es] EL conocimiento sobre el comportamiento de suelos residuales resulta de gran importancia para los proyectos geotécnicos en Brasil y, en particular, en la región de Rio de Janeiro, considerando que el clima tropical y las características geológicas favorecen la existencia de mantos residuales de gran espesor. El presente trabajo estudia el comportamiento tensión-deformación de un suelo residual proveniente de un perfil de alteración de roca gnáisica del macizo de la Tijuca, Rio de Janeiro. Como los suelos residuales gnáisicos preservan las foliaciones heredadas de la roca matriz, fue necesario estudiar si resultaba relevante considerar la aparición de anisotropía en las características de resistencia y deformabilidad de estos suelos. En el estudio se utilizó el equipo triaxial cúbico desarrollado en la PUC-Rio. Este equipo permite el control independente de las tres tensiones principales, siendo más adecuado para la reproducción de las trayectorias de tensiones tridimensionales, usualmente asociadas a obras geotécnicas en el campo, y en particular, para estudios sobre las características de anisotropía de suelos. El programa experimental incluyó ensayos de compresión axial e hidrostática, sobre condiciones drenadas de carga, utilizando el equipo triaxial cúbico. Fueron realizados también ensayos oedométricos convencionales, con el objetivo de obtener las características de compresibilidad del suelo. Fueron moldados cuerpos de prueba a partir de bloques no deformados, paralelos y perpendiculares a la foliación observada en el suelo, lo que permitió el análisis de los resultados para distintas direcciones de carga. Para efecto de comparación sobre la relevancia del arreglo extructural de los granos del suelo, se realizaron ensayos con cuerpos de prueba compactados de los mismos materiales. El análisis de los resultados permitió la obtención de los módulos de deformabilidad y de los parámetros de resistencia del suelo residual. En particular, se verificaron los efectos de la dirección de carga de los cuerpos de prueba, del nível de las tensiones de contensión, del grado de intemperización, de la disposición extructural de los granos y de los efectos del grado de saturación. Se puede concluir que los suelos estudiados no presentaran efectos marcantes de anisotropía en las características de resistencia. Sin embargo, con respecto a la deformabilidad, se puede considerar que el suelo residual joven presentó características anisotrópicas.

Le matériau terre peut apporter une réponse face aux problèmes que les constructions modernes rencontrent en termes d’enjeux sociétaux, économiques et écologiques. Cependant, les difficultés à comprendre et à prédire son comportement représente un obstacle au développement de cette technique dans les pays développés. Cette thèse s’insère dans un projet de recherche appelé « Primaterre » et financé par l’Agence Nationale de la Recherche française (ANR). Il vise à apporter les connaissances scientifiques nécessaires afin de pallier ce manque et aider à établir des règlementations adaptées. Ce travail s’intéresse plus particulièrement à l’impact de l’eau sur le comportement mécanique de la matrice fine du matériau, qui a un impact essentiel sur le comportement du matériau dans son ensemble. Cette matrice est constituée de sables, de limons, et d’argiles, et ce sur trois types de terres prélevées sur d’anciennes constructions en pisé. Afin de réaliser des échantillons les plus identiques et homogènes possible, un moule a tout d’abord été conçu, ce qui a permis de travailler avec des échantillons cylindriques de 3,5cm de diamètre et 7cm de hauteur. Une cellule triaxiale a été utilisée et, la seconde étape a été de concevoir les dispositifs permettant la mesure des déformations axiales et radiales, le conditionnement à température contrôlée et l’imposition d’un flux d’air humide variable de part et d’autre de l’échantillon. Différents types d’essais ont alors pu être réalisés : des essais triaxiaux à différent taux d’humidité relative ainsi que des essais de gonflement. Les paramètres mécaniques obtenus ont pu être analysés à la lumière des caractéristiques matériaux mesurées en parallèle. Enfin, l’analyse des essais de gonflement a été menée à bien à l’aide d’un modèle numérique, et ce afin de pouvoir évaluer des paramètres caractéristiques plus complexes. Ce travail de thèse se conclut par une étude supplémentaire, visant à évaluer l’impact du changement de taille d’échantillon sur les paramètres mécaniques mesurés précédemment. Ces essais ont été effectués sur des échantillons approximativement deux fois plus grands, et grâce à un dispositif expérimental plus simple, utilisant la mesure par corrélation d’images. / Earthen buildings can provide an answer to face difficulties in modern constructions in both terms of sociology, economics as well as ecology. However, the difficulty to understand and to predict their behavior prevent the spreading of this technique in developed countries. This PhD is part of a research program called “Primaterre” and founded by the French National Agency for Research. It aims at providing the necessary scientific knowledge to overcome this lack and at helping the creation of appropriate standards. This work is more precisely focusing on the impact of water on the mechanical behavior of the fine proportion of the material, including sand, silt and clay, and on three different earths coming from existing rammed earth constructions. In order to be able to produce samples as identical and homogeneous as possible, a mold has first been designed, which enable to manufacture cylindrical samples with diameter of 3.5cm and height of 7cm. A triaxial cell was used and, the second step was to design different devices allowing the measurement of axial and radial deformations, the conditioning at constant temperature, and the command of a variable moist air flux at both sides of the sample. Different types of tests have thus been realized : triaxial tests at different relative humidity, as well as swelling tests. The mechanical parameters thus obtained have been analyzed in comparison with material characteristics measured in parallel. Finally, results of swelling tests have been analysed using numerical modelling, in order to assess more complex material characteristics. This thesis work ends with an additional study, aiming at evaluating the impact of scale change on the mechanical parameters previously measured. Tests have been conducted on sample approximatively twice larger, and thanks to a simpler experimental device using measurement through image correlation.

The geotechnical properties of municipal solid waste (MSW) such as compressibility, shear strength and stiffness are of prime importance in design and construction of landfills. However, it is not well clear how the stress-strain and strength characteristics vary with time as the biodegradation of waste continues in the landfill. There is also a need to address the variability of MSW properties and their role in landfill design. The present thesis proposes models for the analyses of stress-strain response of MSW in undrained and drained conditions. The proposed models are based on critical state soil mechanics concept and the modified cam clay model is extended to consider the effects of creep and biodegradation. The models are examined with reference to experimental data and published results of MSW in the form of stress strain response. In addition, the experimental results and the data from published literature are also compared with predictions from hyperbolic model. The proposed models are able to capture the stress strain response of MSW in undrained and drained condition adequately. The applicability of proposed model is presented in terms of shear strength ratio, stiffness ratio and settlement for typical landfill cases. In order to examine the influence of model parameters on shear strength, stiffness ratio and settlement, multilinear regression equations are developed based on response surface method (RSM) for different coefficients of variation (COVs). The effect of variability associated with model parameters is examined using reliability analysis. For better understanding, the present thesis is divided into following seven chapters. Chapter 1 is an introductory chapter, in which the need for use of the constitutive models and its use in engineering response analysis of MSW is presented. Further, the organization of thesis is also presented. Chapter 2 presents various studies with regard to the engineering properties of MSW available in the literature. Different models and approaches proposed by various researchers for the prediction of stress-strain response, time dependent behavior and settlement analysis of the MSW are presented. The uncertainty associated with engineering properties and available methods for reliability analysis and the use of response surface method are presented. Finally, based on the literature review, the scope of the thesis and summary of chapter are presented at the end. Chapter 3 presents composition of MSW, detailed description of the sample preparation, methods adopted in the experimental program and test results of one dimensional compression and consolidated undrained tests. Based on the experimental observations, a constitutive model for municipal solid waste for undrained condition in the framework of modified cam clay model considering mechanical creep and biodegradation mechanisms is proposed. It also provides detailed description of the selection of the input parameters required for the proposed model. Further, the detailed derivation of proposed model and the discussion on evaluation of the input model parameters from triaxial and consolidation tests are presented. The model is examined with reference to the experimental data and published results. The stress strain behavior of MSW is compared with the prediction of stress strain response from hyperbolic model. The comparison of stress strain response is well captured using proposed model for all levels of strain. The major conclusions from the study are presented at the end. Chapter 4 presents experimental results of consolidated drained tests. A constitutive model for MSW for drained condition in the framework of modified cam clay model considering mechanical creep and biodegradation mechanisms is proposed. The model is examined with reference to the experimental data and data from published literature. In addition, stress strain behavior of MSW is compared with the predictions from hyperbolic model. The comparison of stress strain response is well captured using proposed model for all levels of strain. The major conclusions from the study are presented at the end. Chapter 5 presents the applicability of proposed models in terms of shear strength ratio and stiffness ratio for a typical landfill condition. Based on response surface method (RSM), multilinear response surface equations are developed for different variables ( M, λ.b.c.d.Edg ) for different percentages of strain for 10 and 20% COVs of the model parameters. The effect of variability of model parameters is presented in terms of results of reliability analysis for specified performance functions. The major conclusions from the study are presented at the end. Chapter 6 presents an approach for the settlement evaluation of MSW for a typical landfill case of 30 m high. Based on RSM, multilinear response surface equations are developed for the calculation of MSW settlement for 30 years for 10 and 20% COVs. The effect of variability of model parameters is evaluated in term of reliability index for performance function specified in terms of landfill capacity. The major conclusions from the study are presented at the end. Chapter 7 presents a brief summary and conclusions from the various studies reported in the present thesis.

The concept of reinforcement was developed in late 20th century and since then till the recent past there are many works carried out on the effect of fibers in imparting strength and stiffness to the soil. Experimental investigations on fiber reinforced soils showed an increase in shear strength and reduction in post peak loss of strength due to the reinforcement. Analytical/mechanistic models are developed to predict the stress-strain response of fiber reinforced soil (under discrete framework, energy dissipation methods, force equilibrium methods etc). Numerical investigations are also carried out, and it was observed that the presence of random reinforcing material in soils make the stress concentration diffuse more and restrict the shear band formation. Soil properties vary from point to point at micro level and influence stress mobilization. Hence, there is a need to carry out probabilistic analysis to capture the effects of uncertainties and variability in soil and their influence on stress-strain evolution. In the present thesis an attempt has been made to propose a mechanistic model that predicts the stress-strain response of fiber reinforced soil and also considers the effect of anisotropy of fibers. A stochastic/probabilistic model is developed that predicts the stochastic stress-strain response of fiber reinforced soil. In addition, probabilistic analysis is carried out to observe the effect of number of fibers across the shear plane in imparting shear resistance to soil. The mechanistic model and stochastic models are validated with reference to the experimental results of consolidated undrained (CU) triaxial tests on coir fiber reinforced red soil for different fiber contents. The entire thesis is divided into six chapters. Chapter-wise description is given below. Chapter one presents a general introduction to the works carried out on fiber reinforced soils and also the investigations carried out on probabilistic methodologies that takes into account the soil variability. Thus, the chapter gives an outline of the models developed under mechanistic and probabilistic frameworks in the thesis. The objectives and organization of the thesis are also presented. Chapter two presents a detailed review of literature on the role of fibers in fiber reinforced soil. The details of experimental investigations carried out and models developed are explained briefly. Also, the literature pertaining to the role of variability in soil on its engineering behavior is presented. Based on the literature presented in this chapter, concluding remarks are made. Chapter three presents the details of a new mechanistic model developed based on modified Cam-clay model. This model considers the effect of fiber content and also the effect of anisotropy due to fibers. The predictions from the mechanistic model are compared with the experimental results. Under anisotropic condition, as angles of inclination of fiber vary from 0° to 90° with the bedding plane, it is observed that the strength increment in the reinforced soil is not as significant as that observed in isotropic case. Horizontal fibers turn out to be most effective since they are subjected to maximum extension thereby inducing tensile resistance which in turn contributes for strength increase in fiber reinforced soil. Chapter four presents a new approach to predict the stochastic stress-strain response of soil. Non-homogeneous Markov chain (multi-level homogeneous Markov chain) modeling is used in the prediction of stochastic response of soil. The statistical variations in the basic variables are taken into account by considering the response quantities (viz. stress at a given strain or settlement at a given load level) as random. A bi-level Homogeneous Markov chain predicts the stochastic stress-strain response efficiently. The predicted results are in good agreement with the experimental results. An illustration of this model is done to predict the stochastic load-settlement response of cohesionless soil. A simple tri-level homogeneous Markov chain model is proposed to predict settlements of soil at a given load for an isolated square footing subjected to axial compression. A parametric study on the effect of correlation coefficient on the prediction of settlements is performed. Chapter five presents the results of probabilistic analysis carried out to determine the effect of number of fibers across the shear plane in improving the shear strength of soil. It is observed that as the percentage of fibers in the specimen increases, the probability of failure of specimen under the same stress condition reduces and thus the reliability of the fiber reinforced soil system increases. In Chapter six, a summary of the important conclusions from the various studies reported in the dissertation are presented.

Cellular materials like aluminum foam which is the subject of interest here are generally characterized by high energy absorption capacity per unit weight. Materials of this category can be ideal for applications such as packaging and vehicle body structures for enhanced impact safety. A particularly well-known variety of closed-cell aluminum foam is designated as Alporas, which is studied here. From a viewpoint of mechanical behavior, the foam being considered can be represented using either a detailed cellular approach capturing the voids present in foam structure or a phenomenological approach in which experimental stress-strain response is assigned a-priori to solid elements filling up the space occupied by a foam geometry. Both modeling approaches are studied in the present work. It has been shown for the first time that stress-strain behavior under compression including densification can be predicted well with a Kelvin cell-based model, although scope for further improvement exists. Based on a novel combination of compression tests at low strain rates in a UTM and medium strain rates in low velocity impact tests, a relation between foam strength and strain rate has been proposed. This effect of strain rate on strength is captured in a finite element model for analysis using an explicit code with contact simulation capabilities and the predictions for projectile impact tests at higher strain rates using a gas gun-based device have been found to match commendably with results obtained from the said tests.

Die Arbeit stützt sich überwiegend auf die Ergebnisse experimenteller Untersuchungen. Einaxiale Zugversuche an scheibenförmigen Probekörpern bildeten die Basis für die Beschreibung des Tragverhaltens in Form von Spannungs-Dehnungs-Linien. Da die Durchführung von Zugversuchen bekanntlich nicht ganz problemlos ist, wird der Versuchsaufbau besonders sorgfältig dargestellt. Mängel und deren Auswirkung auf die Versuchsergebnisse werden ausführlich diskutiert. Für die Beurteilung der Verbundeigenschaften der Bewehrung ist der Umfang der Kontaktfläche mit der Matrix ein wichtiger Parameter. Es wurde ein Verfahren für die Ermittlung dieser und anderer geometrischen Eigenschaften der Bewehrung entwickelt. Elektronische Aufnahmen von klassischen Dünnschliffen werden dazu mit einem digitalen Bildauswerteprogramm analysiert. Die Berücksichtigung einer Vielzahl von Einflüssen ermöglicht erstmals die reproduzierbare Bestimmung des Umfanges der Kontaktfläche zwischen den Fasern und der Matrix sowie die Querschnittsfläche der Faserbündel in der Matrix ohne subjektive Einflüsse. Das Tragverhalten von unidirektionalen und textilen Bewehrungen aus AR-Glas Filamentgarnen wird mit experimentellen Methoden untersucht. Die Basis bilden in einaxialen Zugversuchen an Dehnkörpern aufgenommene Spannungs-Dehnungs-Linien. Schon bei einer Bewehrung aus unidirektionalen Multifilamentgarnen treten Phänomene auf, die von Bewehrungen aus kompakten, homogenen Querschnitten (Stäben oder Drähten) nicht bekannt sind. Die Multifilamentgarne können selbst schon als Verbundwerkstoff bezeichnet werden, dessen Eigenschaften in einem großen Wertebereich variieren. Mit der textilen Verarbeitung von Multifilamentgarnen werden die (Verbund¬¬-)Eigenschaften entscheidend verändert. Ganz wesentlich ist das Hinzufügen von weiteren Faserscharen und den für die Herstellung der Textilien notwendigen Nähgarnen. Durch die Verarbeitung ändern sich auch Form und Packungsdichte der Multifilamentgarne. Das Zusammenspiel all dieser Einflüsse und die Variationsmöglichkeiten bei der Kombination aller Parameter führen zu einem teilweise deutlich verändertem Tragverhalten des textilbewehrten Betons gegenüber unidirektional bewehrtem Beton. Auf der Basis einfach handhabbarer Modelle wird versucht, Charakteristika des Tragverhaltens zu erklären. Beim textilbewehrten Beton ist jedoch oft kein eindeutiger Zusammenhang erkennbar, weil sich mehrere Einflüsse überlagern. Trotzdem ist es gelungen, zahlreiche, für den textilbewehrten Beton typische Besonderheiten aufzuzeigen und deren Ursachen zu klären. Den Abschluss bilden Überlegungen zur Optimierung der textilen Bewehrungen, die sich aus den beobachteten Phänomenen und deren Ursachen ableiten. / This thesis is mainly based on results of experimental methods. Uniaxial tension tests on strain specimens provide a basis for a description of the load bearing behaviour in the form of stress-strain-curves. It is well known, that the accomplishment of tension tests causes several problems. Therefore the test set-up is described in detail. Deficiencies and their impact on test results are discussed extensively. For the assessment of bond properties the perimeter of the contact area between fibres and matrix is a crucial parameter. A new procedure has been developed for estimating this and other geometrical properties of the reinforcement. Digital images of traditional thin section petrography are analysed with digital image analysis software. The consideration of a multitude of influences enables a reproducible determination of the perimeter of the contact area between fibres and matrix as well as the cross sectional area of the fibre bundles for the first time without subjective influences. The load bearing behaviour of unidirectional fabric reinforcement made from AR-glass filament yarns is examined with experimental methods. Stress-strain-curves from uniaxial tension tests on strain specimen provide a basis. Reinforcements of unidirectional multi filament yarns show already phenomenon?s that are not known from reinforcements with compact homogeneous cross sections (bars or wires). Multi filament yarns could be indicated as an composite material itself whose properties vary in a wide range. During fabric production with textile technologies the (bond-)properties are subject to crucial changes. The adding of extra layers of yarns and needle thread required for connecting these layers are of vital importance. Textile processing changes shape and packing density of the multi filament yarns. The interaction of all these influences and the possible range of combining all parameters lead to pronounced changes in the mechanical properties of textile reinforced concrete also compared to unidirectional fibre reinforcement. Using simple to handle models this work attempts to explain characteristics of the mechanical behaviour. However, for textile reinforced concrete there is often not a clear connection visible. Although numerous typical characteristics of textile reinforced concrete and their causes has been identified. Finally some considerations for optimising fabric reinforcements are given, which has been derived from observed phenomenons and their causes.

This master thesis deals with computational stress-strain analysis of the tailskid of airplane L410 NG with main focus firstly the check current design of the tailskid and then the design another design solution with the able to absorb as much as possible the deformation energy. Solution of this problem is performed using computational modeling utilizing numerical simulation of quasi-static and crash deformation load of the tailskid with using explicit Finite Element Method (FEM) in program ABAQUS v6.14. After the introduction with problem situation and tailskid assembly introductory part is devoted to the research study of various designs of the tailskid for different types of airplanes. There follows these theoretical general principles of thin-walled structures and buckling of them. Before the creating of the computational model itself, the explicit form of the Finite Element Method is better described. The conclusion of this thesis deals with the mutual comparison of the most advantageous design variants of the tailskid and the selection of the most suitable one of them for the airplane L410 NG.

The objective of this diploma thesis is the design of a device that measures the vehicle’s centre of gravity height position. The first part defines individual methods of measurement using various measuring equipment. The next part deals with the definition of requirements for the device and the definition of the design. A stress-strain analysis was executed for selected components. This diploma thesis describes the preparation process of the vehicle and the device for the measurement. The next part is dedicated to the design of the measuring chain and to the evaluation of the results. The thesis concludes with a theoretic analysis of the measurement inaccuracy.

This thesis deals with problems of the hip endoprosthetics area, namely total endoprosthesis (TEP) with Burch-Schneider (BS) split, in which there are many problems in clinical practice. The hip joint load depends on the patient weight and the performed activity. Sedentary job, little exercise, a lot of stress or poor eating habits and overweight associated with it affect negatively hip joint. Increasing hip joint wear and its pain in movement is necessary in several cases to be solved by a surgical procedure in which TEP is applied. When selecting and subsequently applying individual TEP, it is important to pay attention to creating conditions which will allow good fixation. In case of worse mechanical properties of bone tissue, it is very problematic to ensure stability of the implant. Based on several classifications which assess the degree of hip joint damage, it is possible to select a suitable TEP. The BS split, on which this work is focused, is dominantly used in cases of large defects in the acetabulum area. The use of this cage allows to bridgelarge defects and create a new centre of rotation of the hip. Knowledge of the mechanical properties of hip bone tissue can significantly affect the prediction of BS split damage. For this purpose, it was necessary to perform a biomechanical study, which is focused on the influence of worse mechanical properties of bone tissue on BS split failure. The computational modelling using finite element method implemented in the ANSY S software was used for the solution, which enables to solve the mechanical interaction between bone tissue and TEP with BS split. Due to the absence of bone tissue data before application of TEP with BS split, the variants before application of TEP and after application of resurfacing and standard TEP were solved. All variants were solved with the material properties of bone tissue that were determined based on CT images. In addition, all variants were solved for the case of degraded mechanical properties. Based on the numerical simulations results and the Mechanostat hypothesis, a bone tissue analysis of the hip joint was performed before and after application of TEP and TEP with BS split. The results show the influence of the computational model level, which considers the distribution of bone tissue through the inhomogeneous model of the material. Therefore, the degraded mechanical properties have a major impact on the stability and strain of the BS split, particularly in the cranial part of the acetabulum.

Submitted master thesis deals with stress - strain analysis of jaw, with dental implant. The implant serve as a suitable pillar for crown or dental bridge, when one or more teeth are lost. The project is oriented on BOI (basale - oseo - integrable) dental implant type, which is produced by DENTALIHDE company. Stress – strain condition of the mandible system with implant have been established by computational simulation, with use of the final elements method. Important part of down jowl is simulated on with EDS and EDDS applied types of implants. After implementation the implant begins to heal. Therefore the special attention is paid to stress - strain states on various level of osteointegration. There is a detail description of production of single part computational model and his solving in the master thesis. Presentation of large chapter with results and subsequent alteration stress - strain analysis is part of the master thesis. Program SolidWorks 2005 was used to create the geometric model. Computational model and the actual solving was accomplished with use of ANSYS 11.0 and ANSYS Wor-kbench systems.