Aspect Ratio Evolution in Embedded, Surface, and Corner Cracks in Finite-Thickness Plates under Tensile Fatigue Loading
This article deals with the computational modelling of the fatigue crack aspect ratio evolution in embedded, surface, and corner cracks located in finite-thickness plates under tensile fatigue. The approach is based on the Paris law for fatigue propagation and an expression for the stress intensity...
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doaj-45572aab11354708a8ad410d3551f84e2020-11-24T21:27:50ZengMDPI AGApplied Sciences2076-34172017-07-017774610.3390/app7070746app7070746Aspect Ratio Evolution in Embedded, Surface, and Corner Cracks in Finite-Thickness Plates under Tensile Fatigue LoadingJesús Toribio0Juan-Carlos Matos1Beatriz González2Fracture & Structural Integrity Research Group (FSIRG), University of Salamanca (USAL), E.P.S., Campus Viriato, Avda. Requejo 33, 49022 Zamora, SpainFracture & Structural Integrity Research Group (FSIRG), University of Salamanca (USAL), E.P.S., Campus Viriato, Avda. Requejo 33, 49022 Zamora, SpainFracture & Structural Integrity Research Group (FSIRG), University of Salamanca (USAL), E.P.S., Campus Viriato, Avda. Requejo 33, 49022 Zamora, SpainThis article deals with the computational modelling of the fatigue crack aspect ratio evolution in embedded, surface, and corner cracks located in finite-thickness plates under tensile fatigue. The approach is based on the Paris law for fatigue propagation and an expression for the stress intensity factor (SIF) provided by Newman and Raju. Numerical results indicate that the crack path develops in such a manner that all flaws tend to reach similar aspect ratios, i.e., a preferential crack path does exist along which there is a one-to-one relationship between the aspect ratio and the relative crack depth (a sort of master curve in the matter of fatigue crack path evolution). Such a reference curve corresponds to that of a very superficial initial flaw with almost circular shape. The convergence (quicker or slower approach between fatigue crack paths starting from different initial defects) is higher for surface flaws than for corner cracks, and quicker for the latter than for embedded discontinuities. Corner defects increase their size faster than surface cracks, and the latter do the same quicker than the embedded ones.https://www.mdpi.com/2076-3417/7/7/746numerical modellingfinite-thickness cracked plateParis lawpreferential crack pathfatigue life |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Jesús Toribio Juan-Carlos Matos Beatriz González |
spellingShingle |
Jesús Toribio Juan-Carlos Matos Beatriz González Aspect Ratio Evolution in Embedded, Surface, and Corner Cracks in Finite-Thickness Plates under Tensile Fatigue Loading Applied Sciences numerical modelling finite-thickness cracked plate Paris law preferential crack path fatigue life |
author_facet |
Jesús Toribio Juan-Carlos Matos Beatriz González |
author_sort |
Jesús Toribio |
title |
Aspect Ratio Evolution in Embedded, Surface, and Corner Cracks in Finite-Thickness Plates under Tensile Fatigue Loading |
title_short |
Aspect Ratio Evolution in Embedded, Surface, and Corner Cracks in Finite-Thickness Plates under Tensile Fatigue Loading |
title_full |
Aspect Ratio Evolution in Embedded, Surface, and Corner Cracks in Finite-Thickness Plates under Tensile Fatigue Loading |
title_fullStr |
Aspect Ratio Evolution in Embedded, Surface, and Corner Cracks in Finite-Thickness Plates under Tensile Fatigue Loading |
title_full_unstemmed |
Aspect Ratio Evolution in Embedded, Surface, and Corner Cracks in Finite-Thickness Plates under Tensile Fatigue Loading |
title_sort |
aspect ratio evolution in embedded, surface, and corner cracks in finite-thickness plates under tensile fatigue loading |
publisher |
MDPI AG |
series |
Applied Sciences |
issn |
2076-3417 |
publishDate |
2017-07-01 |
description |
This article deals with the computational modelling of the fatigue crack aspect ratio evolution in embedded, surface, and corner cracks located in finite-thickness plates under tensile fatigue. The approach is based on the Paris law for fatigue propagation and an expression for the stress intensity factor (SIF) provided by Newman and Raju. Numerical results indicate that the crack path develops in such a manner that all flaws tend to reach similar aspect ratios, i.e., a preferential crack path does exist along which there is a one-to-one relationship between the aspect ratio and the relative crack depth (a sort of master curve in the matter of fatigue crack path evolution). Such a reference curve corresponds to that of a very superficial initial flaw with almost circular shape. The convergence (quicker or slower approach between fatigue crack paths starting from different initial defects) is higher for surface flaws than for corner cracks, and quicker for the latter than for embedded discontinuities. Corner defects increase their size faster than surface cracks, and the latter do the same quicker than the embedded ones. |
topic |
numerical modelling finite-thickness cracked plate Paris law preferential crack path fatigue life |
url |
https://www.mdpi.com/2076-3417/7/7/746 |
work_keys_str_mv |
AT jesustoribio aspectratioevolutioninembeddedsurfaceandcornercracksinfinitethicknessplatesundertensilefatigueloading AT juancarlosmatos aspectratioevolutioninembeddedsurfaceandcornercracksinfinitethicknessplatesundertensilefatigueloading AT beatrizgonzalez aspectratioevolutioninembeddedsurfaceandcornercracksinfinitethicknessplatesundertensilefatigueloading |
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