X-ray microtomographic characterisation of porosity and its influence on fatigue crack growth

被引：30

作者：

Li, P. ^{[1
]}

Lee, P. D.

Lindley, T. C.

Maijer, D. M.

Davis, G. R.

Elliott, J. C.

机构：

[1] Univ London Imperial Coll Sci Technol & Med, Dept Mat, London, England

[2] Univ British Columbia, Dept Mat Engn, Vancouver, BC V5Z 1M9, Canada

[3] Univ London Imperial Coll Sci Technol & Med, Inst Dent, Biophys Grp, London, England

来源：

ADVANCED ENGINEERING MATERIALS | 2006年 / 8卷 / 06期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1002/adem.200600051

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A quantitative characterization of crack growth and its interaction with the 3D morphology of porosity in A356-T6 fatigue specimens using X-ray microtomography (XMT) was studied. The path followed by the crack is governed by the stress concentration which is highest along the transverse plane ahead of the crack due to the cross-sectional area reduction. The crack was found to propagate macroscopically along a transverse plane and it exhibited a jagged appearance with relatively large voxel size. The effect of the pores on the stress/strain concentration and its link to fatigue crack growth were investigated using finite element analysis. The XMT scans of the interrupted fatigue test specimens showed that cracks tend to deviate towards pores in close proximity to the transverse plane normal to the loading direction.

引用

页码：476 / 479

页数：4

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