期刊
ACTA MATERIALIA
卷 53, 期 5, 页码 1499-1509出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2004.12.004
关键词
aluminum alloys; small fatigue cracks; plastic deformation; fatigue crack growth; laser machining
Small fatigue crack propagation in two cast aluminum alloys - W319-T7 and A356-T6 - was investigated by initiating cracks from micronotches. It was demonstrated that an underlying relationship describes the growth behavior of these fatigue cracks. This relationship is based on a parameter which is the product of monotonic and cyclic crack tip displacements and under conditions of small scale yielding reduces to the Paris law with an exponent of four. The value of this parameter can be calculated from the mechanical properties obtained from a simple tensile test and it can account for the effect of temperature, maximum stress, microstructure, heat treatment, alloying and load ratio on small fatigue crack growth rates. The crack growth rates are linearly related to the value of this parameter and the validity of this relationship can be supported by physical considerations. (C) 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据