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首页> 外文期刊>International Journal of Mechanical Sciences >Effects of tensile/compressive overloads on fatigue crack growth behavior of an extra-low-interstitial titanium alloy
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Effects of tensile/compressive overloads on fatigue crack growth behavior of an extra-low-interstitial titanium alloy

机译：拉伸/压缩过载对超低间隙钛合金疲劳裂纹扩展行为的影响

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摘要

In this paper, fatigue crack propagation tests of an extra-low-interstitial titanium alloy (Ti-6A1-4V ELI) were performed under various tensile/compressive overloads in an otherwise constant amplitude loading sequence. The effects of the tensile/compressive overloads on the crack growth rate, crack growth path and crack growth profile of the Ti-alloy were investigated. The results showed that the tensile overload resulted in an overload-ratio-dependent crack growth retardation, while almost no effect of the compressive overload on the crack growth rate was found. With the increasing tensile overload ratio, the crack closure effect exhibited increase. Tensile overloads also enlarge the crack deflection and produced more secondary cracks in the overload-affected zone of the crack-tip. The possible reasons for the overload-dependent crack growth behavior of Ti-6A1-4V ELI alloy were further analyzed in terms of microstructure, crack closure and crack-tip plastic zone.
机译：在本文中，在不同的拉伸/压缩过载情况下，以恒定振幅加载顺序对超低间隙钛合金（Ti-6A1-4V ELI）进行了疲劳裂纹扩展测试。研究了拉伸/压缩过载对钛合金裂纹扩展速率，裂纹扩展路径和裂纹扩展轮廓的影响。结果表明，拉伸过载导致了过载率相关的裂纹扩展延迟，而压缩过载几乎没有发现裂纹扩展速率的影响。随着拉伸过载率的增加，裂纹封闭效果逐渐增强。拉伸过载还扩大了裂纹变形，并在裂纹尖端的过载影响区产生了更多的次级裂纹。从微观结构，裂纹闭合和裂纹尖端塑性区等方面进一步分析了Ti-6A1-4V ELI合金超负荷依赖性裂纹扩展行为的可能原因。

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