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Plasticity induced crack closure effect on fatigue crack growth
Šebík, Marek ; Vojtek, Tomáš (referee) ; Hutař, Pavel (advisor)
This study is focused on plasticity induced crack closure effect on fatigue crack propagation. It utilizes finite element method modeling to evaluate the effect of this phenomenon on crack propagation at a series of MT specimen configurations. The modeling has been done both 2D and 3D. Comparison of computed results with experiments explains effect of the phenomenon at performed experimental measurements. Above all, three-dimensional modeling provides assessment of plasticity induced crack closure through thickness of the object. Thereby it explains shapes of fatigue crack fronts and lays foundations for including plasticity induced crack closure phenomenon to fatigue crack growth predictions in three-dimensional space.
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The influence of specimen dimensions on fatigue crack closure
Šebík, Marek ; Ševčík, Martin (referee) ; Poduška, Jan (advisor)
This study is focused on fatigue crack propagation, especially on plasticity-induced fatigue crack closure. The influence of specimen dimensions on fatigue crack closure is assessed by evaluation and consequent comparison of opening and closing stresses on two different fatigue specimen numerical models: compact tension specimen and center cracked plate tension specimen, using nonlinear material model. The numerical modeling of the phenomenon utilized finite element method. The models were created in Ansys programming language, APDL. The first part of the study deals with theoretical research of the subject. The second part consists of description and results of the numerical modeling.
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Plasticity induced crack closure effect on fatigue crack growth
Šebík, Marek ; Vojtek, Tomáš (referee) ; Hutař, Pavel (advisor)
This study is focused on plasticity induced crack closure effect on fatigue crack propagation. It utilizes finite element method modeling to evaluate the effect of this phenomenon on crack propagation at a series of MT specimen configurations. The modeling has been done both 2D and 3D. Comparison of computed results with experiments explains effect of the phenomenon at performed experimental measurements. Above all, three-dimensional modeling provides assessment of plasticity induced crack closure through thickness of the object. Thereby it explains shapes of fatigue crack fronts and lays foundations for including plasticity induced crack closure phenomenon to fatigue crack growth predictions in three-dimensional space.
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|
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The influence of specimen dimensions on fatigue crack closure
Šebík, Marek ; Ševčík, Martin (referee) ; Poduška, Jan (advisor)
This study is focused on fatigue crack propagation, especially on plasticity-induced fatigue crack closure. The influence of specimen dimensions on fatigue crack closure is assessed by evaluation and consequent comparison of opening and closing stresses on two different fatigue specimen numerical models: compact tension specimen and center cracked plate tension specimen, using nonlinear material model. The numerical modeling of the phenomenon utilized finite element method. The models were created in Ansys programming language, APDL. The first part of the study deals with theoretical research of the subject. The second part consists of description and results of the numerical modeling.
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