Numerical modelling of roughness and plasticity induced crack closure effects in fatigue

被引：0

作者：

Parry, M.R. ^{[1
]}

Syngellakis, S. ^{[2
]}

Sinclair, I. ^{[1
]}

机构：

[1] Materials Research Group, University of Southampton, School of Engineering Sciences, Highfield, Southampton, SO17 1BJ, United Kingdom

[2] Compl. Engineering and Design Groups, University of Southampton, School of Engineering Sciences, Highfield, Southampton, SO17 1BJ, United Kingdom

来源：

Materials Science Forum | 2000年 / 331卷

关键词：

Computer simulation - Cracks - Deformation - Fatigue of materials - Finite element method - Mathematical models - Morphology - Strain - Surfaces;

D O I：

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中图分类号：

学科分类号：

摘要：

The incidence of roughness induced fatigue crack closure has been studied by finite element modelling. Based on an analysis of both overall specimen compliance and node behaviour along the crack path the present modelling shows: (a) an increasing effect of crack path angle on roughness induced closure levels in keeping with the simple analytical model of Suresh and Ritchie; (b) the mechanism by which closure occurs is due to residual plastic strains in the wake, rather than global shear displacements of the fracture surfaces due to mixed-mode behaviour at the crack tip; and (c) the closure levels are relatively low compared to experimental data, consistent with the absence of environmental irreversibility in the finite element models and the idealised crack path morphologies that were used. Slip band simulations show a significant increasing effect of inhomogeneous deformation on closure levels, improving the apparent accuracy of the modelling results.

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