An investigation of the high-strain-rate mechanical properties, deformation mechanisms, and fracture characteristics of a Zr-based bulk metallic glass (BMG) and its composite with tungsten was conducted through the use of controlled impact experiments and constitutive modeling. The overall objective of this research was to determine the high-strain-rate deformation and failure mechanisms of a BMG and its composite as a function of stress state and strain rate, and describe the mechanical behavior over a range of loading conditions. The research involved performing controlled impact experiments on BMG composites consisting of an amorphous Zr57Nb5Cu15.4Ni12.6Al10 (LM106) with crystalline tungsten reinforcement particles. Monolithic LM106 was also examined to aid in the understanding of the composite. The mechanical behavior of the composite was investigated over a range of strain rates (10^3 s^-1 to 10^6 s^-1), stress states (compression, compression-shear, tension), and temperatures (RT to 600 C) to determine the dependence of mechanical properties and deformation and failure modes (i.e., homogeneous deformation vs. inhomogeneous shear banding) on these parameters. Mechanical testing in the quasi-static to intermediate strain rate regimes was performed using an Instron, Drop Weight Tower, and Split Hopkinson Pressure Bar, respectively. High-strain-rate mechanical properties of the BMG-matrix composite and monolithic BMG were investigated using dynamic compression (reverse Taylor) and dynamic tension (spall) impact experiments performed using a gas gun instrumented with velocity interferometry and high-speed digital photography. These experiments provided information about dynamic strength and deformation modes, and allowed for validation of constitutive models via comparison of experimental and simulated transient deformation profiles and free surface velocity traces. Hugoniot equation of state measurements were performed on the monolithic BMG to investigate the high pressure phase stability of the glass and the possible implications of a high pressure phase transformation on mechanical properties. Specimens were recovered for post-impact microstructural and thermal analysis to gain information about the mechanisms of dynamic deformation and fracture, and to examine for possible shock-induced phase transformations of the amorphous phase.

[Truncated abstract] An important field of research in orthopaedic biomechanics is the elucidation and mathematical modelling of the mechanical response of cartilaginous tissues. Such research has applications in the understanding of joint function and degenerative processes, as well as in surgical planning and simulation, and engineering of tissue replacements. In the case of surgical and tissue engineering applications especially, patient-specific mechanical properties are highly desirable. Unfortunately, obtaining such information would generally involve destructive mechanical testing of patient tissue, thus rendering the tissue functionally unusable. Development of a laser scanning confocal arthroscope (LSCA) within our School will soon allow non-invasive extraction of 3D microstructural images of cartilaginous tissues in vivo. It is also envisaged that, linked to a suitably formulated constitutive formulation, such information could allow estimation of tissue mechanical response without physical biopsy. This thesis describes the development of techniques to potentially allow non-invasive patient-specific estimation of tissue mechanical response based on confocal arthroscopy data. A microstructural constitutive model is developed which is capable of directly incorporating LSCA-derived patient-specific structural information. A fibre composite type homogenisation approach is used as the basis for the model. ... The result is a series of orientation tensors describing the 3D orientation of linear features in the image stack. The developed analysis techniques are used to estimate fibre volume fraction and orientation distribution for each of the meniscal specimens. The developed constitutive model and image-derived structural parameters are finally used to estimate the reaction force history of two meniscal cartilage specimens subjected to partially confined compression. The predictions are made on the basis of the specimens? individual structural condition as assessed by confocal microscopy and involve no tuning of material parameters. Although the model does not reproduce all features of the experimental curves, as an unfitted estimate of mechanical response the prediction is quite accurate. In light of the obtained results it is judged that more general non-invasive estimation of tissue mechanical properties is possible using the developed framework. The likely limitations and potential areas of improvement are discussed.

This research is inserted in Line of Formation, Knowledge and Teacher Professional Development , of the Education Master s Degree at Universidade Federal de Santa Maria, and had as main goal to understand how occurs the constituent processes of higher education for teachers physiotherapists who acts in the Course of Physical Therapy, in the context of the Universidade Federal de Santa Maria, concerning the integration between the knowledge acquired in graduation and the knowledge of teaching higher. Of this goal result three specific objectives, that are: understanding how occurs the formation process of the teachers physiotherapists; recognize which knowledge the Physical Therapy s teachers mobilizes in their pedagogical action; understand how teachers physiotherapists narrate the integration between knowledge of the graduate to the knowledge necessary for teaching practice. The theoretical contribution was composed by studies that concerns of the theme Higher Education / University Pedagogy (Zabalza, 2004; Garcia, 1999; Lucarelli, 2004, 2008; Anastasiou, 2002, 2007; Anastasiou e Alves, 2003; Pimenta e Anastasiou, 2005; Tardif, 2002; Cunha, 2004; Bolzan, 2008; Isaia e Bolzan, 2004, 2006, 2007; Bolzan e Isaia, 2006, entre outros) and authors that treats of the Physiotherapy and its trajectory (Rebelatto e Botomé, 2008; Haddad et al., 2006; Andrade, Lemos e Dall Ago, 2006), among others. To achieve the goals, we conducted a search of the type qualitative narrative, whose tools of data collection were narrative interviews, realized from a guide of topics. The people were six teachers of the UFSM s course of Physiotherapy. Besides the interviews, we request each teacher to available the didactic material of their discipline, to complement the analysis of narratives. Made part of the analysis as the background, the Pedagogic Project of the course of Physiotherapy. Through the content analysis it was possible to build three categories. The strength of the graduation of physical therapist was characterized by elements that showed the importance attached to the practice of the profession for the teaching role, when the subjects showed a large appreciation of the professional knowledge, or when give prominence mobilizing elements of teaching, related to Physiotherapy. Challenges facing the teaching was marked by the recurrence of elements that showed the difficulties of the teachers in front of teaching performance, at the beginning of their career in this profession for which were not initially prepared, or at their continued exercise, when they reporting practices and concepts that courses to the traditional model of education. The category learning to be a teacher presented evidence narratives of a learning process teaching, demonstrating a capability in the teaching of these people in the direction of processes of teaching and learning that take into account the people learners, especially favored by DCN for courses of Physiotherapy (2002). We understand that the constitutive processes of the higher education, for teachers physiotherapists, occur in the entwine of knowledge of the profession and the knowledge learned of the and about teaching, which occurs across the course of trajectory oh these teachers. This process is stimulated when there is the possibility of sharing between people, so that the reflection on their actions promotes an awareness of them and thus its transformation. / Esta pesquisa insere-se na Linha Formação, Saberes e Desenvolvimento Profissional Docente, do Programa de Pós-Graduação em Educação da UFSM e teve como objetivo principal compreender como ocorrem os processos constitutivos da docência superior para os professores fisioterapeutas que atuam no Curso de Fisioterapia, no contexto da Universidade Federal de Santa Maria, tendo em vista a integração entre os saberes adquiridos na formação inicial e os saberes da docência superior. Desse objetivo decorreram três objetivos específicos, que são: compreender como ocorre o processo formativo dos professores fisioterapeutas, explicitado através de suas narrativas; reconhecer quais saberes os professores de Fisioterapia mobilizam na sua ação pedagógica; compreender como os docentes fisioterapeutas explicitam em suas narrativas a integração entre saberes da formação profissional aos saberes necessários à prática docente. O aporte teórico constituiu-se por estudos que tratam da temática referente ao Ensino Superior e à Pedagogia Universitária (Zabalza, 2004; Garcia, 1999; Lucarelli, 2004, 2008; Anastasiou, 2002, 2007; Anastasiou e Alves, 2003; Pimenta e Anastasiou, 2005; Tardif, 2002; Cunha, 2004; Bolzan, 2008; Isaia e Bolzan, 2004, 2006, 2007; Bolzan e Isaia, 2006, entre outros) e autores que tratam da Fisioterapia e sua trajetória (Rebelatto e Botomé, 2008; Haddad et al., 2006; Andrade, Lemos e Dall Ago, 2006), entre outros. Para alcançar os objetivos, realizamos uma pesquisa do tipo qualitativa narrativa, cujos instrumentos de coleta foram entrevistas narrativas, realizadas a partir de roteiro de tópicos-guia. Os sujeitos foram seis docentes do curso de Fisioterapia da UFSM. Além das entrevistas, solicitamos a cada sujeito que disponibilizasse o material didático de sua disciplina, a fim de complementar a análise das narrativas. Fez parte da análise, como pano de fundo, o projeto pedagógico do curso de Fisioterapia. Por meio da análise de conteúdo, foi possível construirmos três categorias. A força da formação de fisioterapeuta caracterizou-se por elementos que evidenciaram a importância atribuída à prática da profissão para a atuação docente, quando os sujeitos demonstraram uma grande valorização dos saberes profissionais, ou quando destacaram elementos mobilizadores da docência, relacionados à Fisioterapia. Desafios pedagógicos face à docência caracterizou-se pela recorrência de elementos que explicitaram as dificuldades dos professores de Fisioterapia frente à atividade docente, seja no início da carreira nesta profissão para a qual não foram, inicialmente, preparados, seja no exercício continuado da mesma, ao relatarem práticas e concepções que se direcionam ao modelo tradicional de ensino. Já a categoria Aprendendo a ser professor apresentou evidências narrativas de um processo de aprendizagem docente, demonstrando uma potencialidade presente na prática pedagógica destes sujeitos, na direção de processos de ensino e de aprendizagem que levam em conta os sujeitos aprendentes, sobretudo favorecidos pelas DCN para os cursos de Fisioterapia (2002). Compreendemos que os processos constitutivos da docência superior, para os professores fisioterapeutas, ocorrem no entrelaçamento de saberes próprios da profissão e de saberes aprendidos da e sobre a docência, o que se dá ao longo de toda a trajetória destes profissionais. Este processo é alavancado quando existe a possibilidade de compartilhamento entre os sujeitos, de maneira que a reflexão sobre suas ações favoreça uma tomada de consciência sobre as mesmas e, assim, a sua transformação.

Dans ce travail de thèse, une modélisation multi-échelle est mise en place à partir du concept d’homogénéisation périodique pour étudier le comportement cyclique et dépendant du temps des composites tissés à matrice thermoplastique. Avec l’approche proposée, le comportement macroscopique du composite est déterminé à partir d’une simulation éléments finis effectuée sur une cellule unitaire représentative de la microstructure périodique, où les lois de comportement des constituants sont directement intégrées, à savoir: la matrice et les torons. La réponse locale de la matrice est décrite par une loi de comportement phénoménologique multi-mécanismes intégrant viscoélasticité, viscoplasticité et endommagement ductile. Pour les torons, une loi de comportement hybride micromécanique-phénoménologique est considérée. Cette dernière prend en compte l’endommagement anisotrope et l’anélasticité induite par la présence d’un réseau diffus de microfissures à travers une description micromécanique d’un volume élémentaire représentatif contenant des microfissures. Les capacités du modèle multi-échelles sont validées en comparant les prédictions numériques aux essais expérimentaux. Les capacités du modèle sont également illustrées à travers plusieurs exemples où le composite subit des déformations dépendantes du temps lors de chargements monotones, de chargements à amplitude constante ou cyclique et encore lors de chargement multiaxiaux non proportionnels. En outre, le modèle multi-échelle est aussi utilisé pour analyser l’influence des mécanismes de déformation locaux sur la réponse macroscopique du composite. / In this thesis, a multi-scale model established from the concept of periodic homogenization is utilized to study the cyclic and time-dependent response of thermoplastic-based woven composites. With the proposed approach, the macroscopic behaviour of the composite is determined from a finite element simulation of the representative unit cell of the periodic microstructure, where the local constitutive behaviours of the components are directly integrated, namely: the matrix and the yarns. The local response of the thermoplastic matrix is described by a phenomenological multi-mechanisms constitutive model accounting for viscoelasticity, viscoplasticity and ductile damage. For the yarns, a hybrid micromechanical-phenomenological constitutive model is considered. The latter accounts for anisotropic damage and anelasticity induced by the presence of a diffuse micro-crack network through the micromechanical description of a micro-cracked representative volume element. The capabilities of the multi-scale model are validated by comparing the numerical prediction with experimental data. The capabilities of the model are also illustrated through several examples where the composite undergoes time-dependent deformations under monotonic loading, constant or cyclic stress levels and non-proportional multi-axial loading. Furthermore, the multi-scale model is also employed to analyse the influence of the local deformation processes on the macroscopic response of the composite.

Un nouveau concept d'échangeur de chaleur compacte est développé afin d’améliorer les performances du système de conversion d'énergie pour le réacteur ASTRID. La fabrication de géométries complexes (canaux rectangulaires millimétriques) est possible grâce au procédé de soudage diffusion : des tôles rainurées en acier inoxydable 316L sont empilées en conteneur et soudées lors d'un cycle de Compaction Isostatique à Chaud (CIC). La problématique est alors d'obtenir des interfaces résistantes tout en limitant la déformation des canaux nuisible à l’efficacité de l’échangeur. Pour arriver au meilleur compromis, les travaux de cette thèse vont aider à l’optimisation des paramètres pression/temps/température du cycle de CIC.Le premier axe de travail porte sur la simulation numérique de la déformation d’un tel échangeur lors de la CIC. L’influence des paramètres numériques (taille des éléments, critère de convergence) a été étudiée afin d’optimiser la précision et la vitesse des calculs. Les simulations ont mis en évidence l’importance des défauts d’empilements de la structure (glissements et ondulations des tôles) dans l’augmentation de la déformée de l’échangeur. Puis une caractérisation mécanique poussée des tôles laminées a mené à l’identification d’une loi de comportement entre 20°C à 1040°C.Le second axe porte sur la modélisation de l'évolution des interfaces lors du soudage diffusion et la prédiction de la tenue mécanique de ces dernières, l'ensemble pouvant mener à la définition d'un critère de validité des interfaces.Une étude microstructurale et mécaniques des interfaces a permis d’établir une corrélation entre la tenue mécanique d’un joint soudé-diffusé et son taux de surface soudée. En effet, la disparition de la porosité résiduelle est le critère principal pour obtenir de bonnes propriétés mécaniques à l’interface. Toutefois, le franchissement de l’interface par les joints de grains, est nécessaire pour retrouver les propriétés des tôles laminées. Un modèle analytique de fermeture des porosités (Hill et Wallach) est utilisé pour calculer le taux de surface soudée d’une interface en fonction des paramètres du cycle de CIC en modélisant la contribution des mécanismes (visco)plastique et diffusifs (en surface et au joint). Associé à la corrélation entre tenue mécanique et taux de surface soudée, il permet de proposer un outil prédictif pour la tenue mécaniques des interfaces soudé-diffusées. / A new concept of compact plate heat exchanger is developed for the energy conversion system performances of the ASTRID reactor. Manufacturing the complex geometry is possible by a diffusion-welding process: engraved 316L stainless steel plates are stacked and bonded during a Hot Isostatic Pressing cycle (HIP). The problematic is to get strong interfaces without deforming the channels which is harmful for the exchanger efficiency. To reach a good compromise, this thesis work will help to optimize the HIP parameters (pressure/temperature/ time).The first line of work is about the simulation of the heat exchanger deformation along manufacturing process. The influence of numerical parameters (elements size, convergence criterion) was studied to optimize the accuracy and the calculation time. Simulations have shown the importance of structure stack faults (sliding and plate ripples) in the increase of exchanger deformation. Then, a mechanical characterisation of plates was carried out to identify the constitutive equation between 20°C and 1040°C.The second line is about the interface modelling along welding and the prediction of their mechanical strength, as a whole can lead to the definition of an interface acceptability criterion. A microstructural and mechanical study has enabled to correlate the mechanical strength of a diffusion-bonded junction and its bonded area. Indeed, residual porosity disappearance is the main criterion to get good interfaces mechanical strength. However, the grain boundary migration is required to reach the rolled material properties. A void closure analytical model (Hill and Wallach) was used to estimate the bonded area of an interface according to HIP cycle parameters by modelling the contribution of (visco)plastic and diffusion (surface and boundary) mechanisms. Associated with the correlation between mechanical strength and the fraction of bonded area, it enables to propose a predictive tool for the mechanical strength of diffusion-bonded interfaces.

This work presents a strategy for the coupled poro-elasto-plastic formulation. The Finite Element Method (FEM) is used to solve the differential equations, interpolating displacement and pore pressure fields. This problem is solved fully coupled, based on an only one system of equations. The nonlinear problem is globally solved by the Newton-Raphson procedure, and the Closest Point algorithm is implemented for the returning map in the elasto-plastic models. Based on a computational module that has already been developed (PORO), which is written using C++ language and Object-Oriented Programming (OOP), this work expands this program creating new classes for different elasto-plastic constitutive models. The program is verified by classical examples in the literature such as the poro-elastic column and the problem of Schiffman. Some strategies for optimization the computational cost are presented, which use specialized math libraries (MKL) and code parallelization (OpenMP). / Este trabalho apresenta, discute e implementa a formulação poro-elastoplástica fortemente acoplada. A discretização espacial das equações diferenciais governantes é realizada através do Método dos Elementos Finitos (MEF), com interpolação do campo de deslocamento e da poropressão. O problema poro-mecânico é resolvido de forma totalmente acoplada, com base em um único sistema de equações. O método iterativo de Newton-Rhapson é empregado para a solução global do problema não linear, tendo ainda o algoritmo implícito iterativo Closest Point para a integração local das equações da plasticidade. Baseando-se em um programa computacional pré-existente denominado PORO, escrito na linguagem C++ e que utiliza o paradigma de Programação Orientada a Objetos (POO), faz-se a adaptação desse código através da criação de novas classes para permitir o uso de modelos constitutivos elastoplásticos e lei de fluxo associada no acoplamento poro-mecânico. Para verificação do programa são analisados problemas clássicos da literatura, a exemplo da coluna poro-elástica e o caso de Schiffman. Descrevem-se ainda algumas estratégias de otimização do custo computacional, implementando-se o uso de bibliotecas matemáticas (MKL) e paralelização do código (OpenMP).

O conhecimento do comportamento mecânico do material é vital para a previsão da durabilidade e atendimento aos requisitos iniciais de projeto. Por meio de ensaios experimentais é possível mensurar esse comportamento e utilizar como parâmetro de entrada em simulações numéricas. Nesse ponto a temperatura altera significativamente as propriedades mecânicas estáticas e dinâmicas do material. Testes de fadiga devem ser considerados na caracterização do material mesmo que um alto custo e tempo sejam necessários. Assim o objetivo deste trabalho é avaliar o comportamento termo-mecânico do policloropreno em tração e fadiga. Este estudo se fez necessário para prever a durabilidade em diversas temperaturas em mancais de rolamento de cardans que exigem rigidez e durabilidade. A abordagem proposta consiste em formular equações constitutivas que considerem as constantes dependentes da temperatura para a situação estática (ensaio de tração) e dinâmica (ensaio de fadiga). Foram estudados 4 modelos constitutivos já consagrados na literatura. Corpos de prova normatizados foram utilizados para a avaliação experimental do material tanto em tração quanto em fadiga. Pode-se concluir que esta abordagem conseguiu modelar adequadamente o comportamento mecânico em ambas as situações estudadas. / Mechanical behavior of materials is vital for predicting durability and compliance with initial requirements of the project. Through experimental tests can measure this behavior and use as an input parameter in numerical simulations. At this point temperature significantly changes static and dynamic mechanical properties of the material. Fatigue tests should be considered in material characterization even if a high-cost and time are required. So the aim of this study is evaluate the thermo-mechanical behavior of polychloroprene in tension and fatigue. This study was necessary to predict durability in various temperatures in driveshafts of rolling bearings that requires rigidity and durability. The proposed approach is formulating constitutive equations to consider the dependent constant temperature for static situation (tensile test) and dynamic (fatigue test). Four constitutive models already established in literature were studied. Standardized test specimens were used for the experimental evaluation of the material both in tension and in fatigue. It can be concluded that this approach could adequately model the mechanical behavior in both cases studied.

Le matériau composite agrégataire énergétique étudié a un comportement viscoélastique endommageable sensible à la pression de confinement et à la température. Ces travaux concernent la modélisation de l'anisotropie induite par endommagement avec deux objectifs principaux. Dans un premier temps, le caractère anisotrope de l'endommagement est mis en évidence expérimentalement. Des essais alternant tension et compression permettant d'observer l'effet unilatéral d'endommagement. Ensuite, un modèle de comportement est développé pour le matériau d'étude. Des modèles pertinents sont tout d'abord comparés. Le modèle le plus approprié est ensuite amélioré par l'ajout de mécanismes d'endommagement, d'effectivité du dommage et d'un mécanisme de plasticité. Les données expérimentales sont utilisées pour identifier les paramètres du modèle. Ce dernier a été ensuite implémenté dans un logiciel de calcul aux éléments finis (Abaqus / standard) sous la forme d'une procédure Fortran (UMAT). Différents types de chargements sont simulés et confrontés aux résultats expérimentaux. / An explosive aggregate material exhibits a visco-elastic behaviour with damage, internal friction and sensitivity to the confining pressure and temperature. This thesis focuses on the anisotropic elastic damage with unilateral effect. The first aim of this study is to highlight experimentally the anisotropic nature of the damage. Then, a new model is proposed for the studied material. This is achieved using a comparison of some relevant models in order to select the most appropriate among them. The selected model is then improved by adding unilateral effect mechanisms and plasticity. Experimental data is used to characterize the material behaviour and to determine the parameters of improved model. This model has been implemented in the finite element software (Abaqus / Standard) using Fortran procedure (UMAT) and then tested for different loads and compared with experimental results.

Le travail principal de cette thèse consiste à proposer une nouvelle procédure d'identification inverse appliquée aux situations de mise en forme et d'usinage des métaux, qui peut fournir un ensemble de paramètres appropriés pour toute loi constitutive elastoplastique suivant le modèle de plasticité de type J_{2} avec écrouissage isotrope, en évaluant la corrélation entre les réponses expérimentales et numériques. En premier lieu, un programme d'identification a été développé, en combinant l'algorithme de Levenberg-Marquardt et des méthodes de traitement de données pour identifier les paramètres constitutifs. En termes d'expérimentation, des essais de compression et de traction dynamiques ont été effectués. La forme finale déformée des spécimens, qui repose sur une analyse post-mortem, a été choisie comme quantité d'observation. Comme pour la simulation numérique, des modèles numériques de ces mêmes procédures expérimentales ont été construits en utilisant le code éléments finis Abaqus/Explicit afin de fournir des réponses numériques. Un algorithme numérique a été proposé pour l'implémentation de lois constitutives elastoplastiques définies par l'utilisateur dans Abaqus/Explicit. / The main concern of this thesis is to propose a new inverse identification procedure applied to metal forming and machining situations, which can provide an appropriate parameters set for any elastoplastic constitutive law following J_{2} plasticity and isotropic hardening, by evaluating the correlation between the experimental and numerical responses. Firstly the identification program has been developed, which combines the Levenberg-Marquardt algorithm and the Data processing methods to optimize the constitutive parameters. In terms of experimentation, dynamic compression and tensile tests have been conducted. The final deformed shape of specimens, which relies on a post-mortem analysis, has been selected as the observation quantity. As for the numerical simulation, the numerical models of the same experimental procedure have been built with the finite element software Abaqus/Explicit in order to provide numerical responses. A numerical algorithm has been proposed for the implementation of user defined elastoplastic constitutive laws in Abaqus/Explicit.

Work in our society is placed as a central activity of human existence. Thus, it is within the work that the action is more intense, according to Bronckart (2008). Therefore, in order to understand the work of a teacher, it is necessary to understand his/her actions represented in the texts which are produced in the work situations, as well as in the texts about such work. In this context, the aim of this research is to investigate which is the role of the teacher in the material of the proposal of the State Curricular Reference of the Project Lições do Rio Grande. Although this material is not presented as a ―textbook‖, it is possible to verify a prescriptive quality in it. In order to do the aforementioned analysis, I show at first, the theoreticalmethodological references of the table of the Socio-Discursive Interactionism (SDI), which attribute to the language and to the action a central role in the human development. Secondly, I describe a historical overview of the concepts of Work in social terms and of the concepts of the teacher work, which place the problematic of this research into the current studies. And to identify the interpreting categories of action in Lições do Rio Grande, I use the methodological procedures of the analysis of the SDI, which follows this orientation: identification of the context of production and the analysis of the three levels of the analysis: Organizational, Enunciation and Semantics. Finally, I present some considerations about the results and conclusions that were obtained from the extract of the corpus that was analyzed in this study. This research allowed me to conjecture still not conclusively that the material of the Project Lições do Rio Grande approaches the proposals of curricular modernization of other States. This is so, because the analysis of this material points to the fact that the teacher is an ―agent‖, not having his/her own intentions, motivations and capacities, whereas the material of the Project Lições do Rio Grande appears as the ―actor‖, the responsible for the teaching work. / O trabalho em nossa sociedade é colocado como atividade central da existência humana. Logo, é no trabalho que o agir se mostra de forma mais intensa, segundo Bronckart (2008). Desse modo, para compreender o trabalho do professor, é preciso que compreendamos suas ações representadas nos textos produzidos tanto nas situações de trabalho, bem como em textos sobre tal trabalho. Neste contexto, o objetivo desta pesquisa é investigar qual é o papel atribuído ao professor no material da proposta do Referencial Curricular Estadual do Projeto Lições do Rio Grande. Muito embora esse material não se apresente como um ―livro didático‖ é possível verificar nele um caráter prescritivo. No intuito de fazer a análise proposta, apresento, primeiramente, os pressupostos teórico-metodológicos do quadro do Interacionismo Sociodiscursivo (ISD), que atribui à linguagem e ao agir um papel central no desenvolvimento humano. Em um segundo momento, traço um panorama histórico dos conceitos de Trabalho em termos sociais e dos conceitos de trabalho do professor, que situam a problemática desta pesquisa dentro dos estudos atuais. E para identificar as categorias interpretativas do agir no Lições do Rio Grande, lanço mão dos procedimentos metodológicos de análise do ISD, que segue a seguinte orientação: levantamento do contexto de produção e o exame dos três níveis de análise Organizacional, Enunciativo e Semântico. Por fim, apresento as considerações acerca dos resultados e das conclusões, obtidos diante do recorte do corpus examinado ao longo deste trabalho. Esta pesquisa permitiu-me chegar à conclusão, não definitiva, de que o material do Projeto Lições do Rio Grande aproxima-se às propostas de renovação curricular de outros Estados. Além disso, a análise desse material aponta que o professor é um ―agente‖, não tendo intenções, motivos e capacidades próprias, enquanto que o material do Projeto Lições do Rio Grande apresenta-se como o ―ator‖, o responsável pelo trabalho docente.