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An exponential equation of fatigue crack growth in titanium

机译:钛疲劳裂纹扩展的指数方程

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摘要

Titanium and its alloys are known for not showing a high degree of linearity of the fatigue crack growth (FCG) data. In the present work, the FCG curves of commercially pure titanium are evaluated using the conventional Paris approach and a new exponential equation named αβ model, which allows for considering non-linear da/dN-ΔK relationships. The following load ratios (min/max) were adopted for the fatigue tests: R = 0.05, 0.1, 0.15, 0.30, 0.50 and 0.60. The αβ model is more effective than Paris-based equations in describing the FCG behavior of titanium and can be easily generalized to take in account a range of stress ratios. This new model also qualifies as a promising tool to assess the FCG curves of other structural materials.
机译:钛及其合金因未显示出疲劳裂纹扩展(FCG)数据的高度线性而闻名。在目前的工作中,使用常规的巴黎方法和名为αβ模型的新指数方程评估了商业纯钛的FCG曲线,该方程可考虑非线性da /dN-ΔK关系。疲劳试验采用以下载荷比(最小/最大):R = 0.05、0.1、0.15、0.30、0.50和0.60。在描述钛的FCG行为方面,αβ模型比基于Paris的方程更为有效,并且可以很容易地将其泛化以考虑一定范围的应力比。这个新模型还可以作为评估其他结构材料的FCG曲线的有前途的工具。

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