Mixed mode fatigue crack propagation in a ferritic-perlitic cold drawn tube

被引：2

作者：

Beretta, S. ^{[1
]}

Cerrini, A. ^{[1
]}

Desimone, H. ^{[2
]}

机构：

[1] Politecn Milan, Dept Mech, I-20158 Milan, Italy

[2] Tenaris Dalmine, I-24044 Dalmine, Italy

来源：

ENGINEERING FRACTURE MECHANICS | 2008年 / 75卷 / 3-4期

关键词：

mode III; defects; co-planar growth; mode I; competition;

D O I：

10.1016/j.engfracmech.2007.03.042

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

Previous work by the authors has shown that torsional fatigue tests on cold drawn tube specimens with a longitudinal micronotch present both Mode III ahead of the crack tip (throughout the tube thickness) and Mode I at the defect edges. The co-planar Mode III propagation was prevalent and is followed by Mode 11 crack propagation along the cold drawn direction. In this work, this behaviour is further investigated by a new series of experimental tests together with a finite element analysis. The mechanisms behind this competition between Mode I and Mode III cracks are analysed and some fractographies were performed on run-outs, broken and interrupted tests. Indeed, pure Mode I and pure Mode II crack propagation rates along with mixed mode crack propagation rates are analysed. Finally, the conditions in order to get Mode I crack growth or shear driven propagation are discussed. (C) 2007 Elsevier Ltd. All rights reserved.

引用

页码：845 / 856

页数：12

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