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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
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Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 1 to 10 of 359 (0.033 seconds)Spelling suggestions: "subject:"cracks"" "subject:"btracks""
| 1 |
Fluid/structure interaction in dynamic crack propagation problemsCaldis, E. S. January 1982 (has links)
No description available.
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| 2 |
Fatigue studies in Al-Mg-Si alloysGuengoeor, Salih January 1990 (has links)
No description available.
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| 3 |
Simulation of Cracks in a Cosserat Medium using the eXtended Finite Element MethodKapiturova, Maria January 2013 (has links)
This research investigates fracture behaviour in the Cosserat materials. The Cosserat elasticity description of the materials incorporates a characteristic length scale (e.g. grains, particles, fibres, etc.) into the model. The characteristic length scale in such materials is known to significantly influence the macroscopic behaviour of the whole body. Simulation of the fracture processes, such as crack opening and propagation, in Cosserat materials still remains a challenge for the scientific community. The goal of this thesis is to propose and validate a two dimensional extended finite element method model of edge cracks within the Cosserat elasticity theory framework.
The crack modelling was conducted using the Finite Element Method (FEM) and eXtended Finite Element Method (XFEM) implemented in the Matlab code. The strong and weak formulations of the problem and the discrete XFEM equations are presented in the thesis. Mode I and II edge crack models in a Cosserat medium are discussed and verified through a series of patch and convergence tests. In addition, the numerical evaluation of the J-integral for the Cosserat medium is presented, and the J-integral for the Cosserat medium is compared to the J-integral for the classical elasticity.
The XFEM/Cosserat method is shown to be robust and able to effectively model the edge crack problems in a Cosserat medium. Moreover, the Cosserat elastic parameter is found to be a powerful coupling tool between the microrotations and the translations. The Cosserat J-integral differs from the classical J-integral by 2% to 40%, for a given crack depending on the micropolar elastic coupling constant.
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| 4 |
Simulation of Cracks in a Cosserat Medium using the eXtended Finite Element MethodKapiturova, Maria January 2013 (has links)
This research investigates fracture behaviour in the Cosserat materials. The Cosserat elasticity description of the materials incorporates a characteristic length scale (e.g. grains, particles, fibres, etc.) into the model. The characteristic length scale in such materials is known to significantly influence the macroscopic behaviour of the whole body. Simulation of the fracture processes, such as crack opening and propagation, in Cosserat materials still remains a challenge for the scientific community. The goal of this thesis is to propose and validate a two dimensional extended finite element method model of edge cracks within the Cosserat elasticity theory framework.
The crack modelling was conducted using the Finite Element Method (FEM) and eXtended Finite Element Method (XFEM) implemented in the Matlab code. The strong and weak formulations of the problem and the discrete XFEM equations are presented in the thesis. Mode I and II edge crack models in a Cosserat medium are discussed and verified through a series of patch and convergence tests. In addition, the numerical evaluation of the J-integral for the Cosserat medium is presented, and the J-integral for the Cosserat medium is compared to the J-integral for the classical elasticity.
The XFEM/Cosserat method is shown to be robust and able to effectively model the edge crack problems in a Cosserat medium. Moreover, the Cosserat elastic parameter is found to be a powerful coupling tool between the microrotations and the translations. The Cosserat J-integral differs from the classical J-integral by 2% to 40%, for a given crack depending on the micropolar elastic coupling constant.
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| 5 |
A study of ductile damage in metal formingChiou, Jen-Ming January 1996 (has links)
No description available.
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| 6 |
Equations of motion for viscoelastic moving crack problemsGoleniewski, G. January 1988 (has links)
No description available.
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| 7 |
Geometry and constraint effects in mixed mode fractureAyatollahi, Majid Reza January 1998 (has links)
No description available.
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| 8 |
Some aspects of plastic flow, residual stress and fatigue cracks due to rolling and sliding contactBower, A. F. January 1987 (has links)
No description available.
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| 9 |
Interfacial fractureAkisanya, Alfred Rotimi January 1992 (has links)
No description available.
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| 10 |
Simulation and detection of transverse cracks in rotorsNoronha, Roberto F. de January 1989 (has links)
No description available.
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