Mesh sensitivity effects on fatigue crack growth by crack-tip blunting and re-sharpening

Viggo Tvergaard

doi:10.1016/j.ijsolstr.2006.08.037

Mesh sensitivity effects on fatigue crack growth by crack-tip blunting and re-sharpening

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

Crack-tip blunting under tensile loads and re-sharpening of the crack-tip during unloading is one of the basic mechanisms for fatigue crack growth in ductile metals. Based on an elastic–perfectly plastic material model, crack growth computations have been continued up to 700 full cycles by using remeshing at several stages of the plastic deformation, with studies of the effect of overloads or compressive underloads. Recent published analyses for the first two cycles have shown folding of the crack surface in compression, leading to something that looks like striations. The influence of mesh refinement is used to study the possibility of this type of behaviour within the present method. Even with much refined meshes no indication of crack surface folding is found here.

Original language	English
Journal	International Journal of Solids and Structures
Volume	44
Issue number	6
Pages (from-to)	1891-1899
ISSN	0020-7683
DOIs	https://doi.org/10.1016/j.ijsolstr.2006.08.037
Publication status	Published - 2007

Keywords

Crack growth
Plasticity
Large strains
Remeshing
Fatigue

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title = "Mesh sensitivity effects on fatigue crack growth by crack-tip blunting and re-sharpening",

abstract = "Crack-tip blunting under tensile loads and re-sharpening of the crack-tip during unloading is one of the basic mechanisms for fatigue crack growth in ductile metals. Based on an elastic–perfectly plastic material model, crack growth computations have been continued up to 700 full cycles by using remeshing at several stages of the plastic deformation, with studies of the effect of overloads or compressive underloads. Recent published analyses for the first two cycles have shown folding of the crack surface in compression, leading to something that looks like striations. The influence of mesh refinement is used to study the possibility of this type of behaviour within the present method. Even with much refined meshes no indication of crack surface folding is found here.",

keywords = "Crack growth, Plasticity, Large strains, Remeshing, Fatigue",

author = "Viggo Tvergaard",

year = "2007",

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AU - Tvergaard, Viggo

PY - 2007

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N2 - Crack-tip blunting under tensile loads and re-sharpening of the crack-tip during unloading is one of the basic mechanisms for fatigue crack growth in ductile metals. Based on an elastic–perfectly plastic material model, crack growth computations have been continued up to 700 full cycles by using remeshing at several stages of the plastic deformation, with studies of the effect of overloads or compressive underloads. Recent published analyses for the first two cycles have shown folding of the crack surface in compression, leading to something that looks like striations. The influence of mesh refinement is used to study the possibility of this type of behaviour within the present method. Even with much refined meshes no indication of crack surface folding is found here.

AB - Crack-tip blunting under tensile loads and re-sharpening of the crack-tip during unloading is one of the basic mechanisms for fatigue crack growth in ductile metals. Based on an elastic–perfectly plastic material model, crack growth computations have been continued up to 700 full cycles by using remeshing at several stages of the plastic deformation, with studies of the effect of overloads or compressive underloads. Recent published analyses for the first two cycles have shown folding of the crack surface in compression, leading to something that looks like striations. The influence of mesh refinement is used to study the possibility of this type of behaviour within the present method. Even with much refined meshes no indication of crack surface folding is found here.

KW - Crack growth

KW - Plasticity

KW - Large strains

KW - Remeshing

KW - Fatigue

U2 - 10.1016/j.ijsolstr.2006.08.037

DO - 10.1016/j.ijsolstr.2006.08.037

M3 - Journal article

VL - 44

SP - 1891

EP - 1899

JO - International Journal of Solids and Structures

JF - International Journal of Solids and Structures

SN - 0020-7683

IS - 6

ER -