测定金属合金疲劳裂纹扩展的估计方法

R. Hertzberg
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引用次数: 1

摘要

作者最近报道了用一种简单的计算方法估计单片金属合金闭合修正疲劳裂纹扩展(FCP)数据。量E√b,其中E =弹性模量,b为位错Burgers向量,用于定义应力强度因子,对应于FCP速率b/cyc。在较高的FCP速率下(daldN > b), FCP曲线的其余部分遵循如下关系:da/dN = (ΔK/E) 3(1/√b)。计算的FCP数据与最近报道的各种铝、钛和钢合金的实验测试结果吻合良好。这样的计算允许一种快速和廉价的方法来估计金属在长裂纹和短裂纹扩展条件下的FCP响应。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Estimation Procedure for Determination of Fatigue Crack Propagation in Metal Alloys
Estimation of closure-corrected fatigue crack propagation (FCP) data in monolithic metal alloys was reported recently by the author, using a simple computational method. The quantity E√b, where E = the modulus of elasticity, and b, the dislocation Burgers vector, is used to define a stress intensity factor, corresponding to an FCP rate of b/cyc. The remainder of the FCP curve at higher FCP rates (where daldN > b) is found to follow a relation of the form: da/dN = (ΔK/E) 3 (1/√b). Good agreement is found between computed FCP data and recently reported experimental test results for various aluminum, titanium, and steel alloys. Such computations allow for a rapid and inexpensive way to estimate the FCP response of metals under both long and short crack growth conditions.
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