材料科学
微观结构
钛合金
巴黎法
合金
冶金
断裂(地质)
增长率
纹理(宇宙学)
剪切(地质)
复合材料
低周疲劳
疲劳试验
裂缝闭合
断裂力学
人工智能
图像(数学)
计算机科学
数学
几何学
作者
Cheng Li,Wei Li,Shihua Yuan,Xiaolong Li,Liang Cai,Yucheng Zhang,Tianyi Hu,Zhenglin Mo,Muhammad Imran Lashari,Usama Hamid
摘要
Abstract Pulsating tension fatigue tests were conducted at 25°C, 150°C, and 250°C to investigate the effect of temperature on high cycle and very high cycle fatigue behavior of titanium alloy. The fatigue strength decreases with the increase of temperature, and the surface failure is more sensitive to temperature than interior failure. Afterwards, the fatigue fracture morphology, microstructure, and texture of titanium alloy were characterized. The results show that the fracture of larger α p phase with the maximum shear stress and higher strain concentration is responsible for the facet formation. The formation of facets leads to the interior failure at different temperatures. Finally, combining with the definition of interior crack growth rate, an assessment approach was proposed to predict the crack growth rate within the inhomogeneous microstructure area (IMA), which takes crack growth acceleration caused by the increase of temperature into consideration.
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