考虑应力比效应的Ti60钛合金在超高周疲劳 regime下的裂纹萌生机制及寿命预测
Crack Initiation Mechanism and Life Prediction of Ti60 Titanium Alloy Considering Stress Ratios Effect in Very High Cycle Fatigue Regime.
作者信息
He Ruixiang, Peng Haotian, Liu Fulin, Khan Muhammad Kashif, Chen Yao, He Chao, Wang Chong, Wang Qingyuan, Liu Yongjie
机构信息
Failure Mechanics and Engineering Disaster Prevention Key Laboratory of Sichuan Province, Sichuan University, Chengdu 610207, China.
MOE Key Laboratory of Deep Earth Science and Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, China.
出版信息
Materials (Basel). 2022 Apr 11;15(8):2800. doi: 10.3390/ma15082800.
Ultrasonic fatigue tests were performed on Ti60 titanium alloy up to a very high cycle fatigue (VHCF) regime at various stress ratios to investigate the characteristics. The S-N curves showed continuous declining trends with fatigue limits of 400, 144 and 130 MPa at 10 cycles corresponding to stress ratios of R = -1, 0.1 and 0.3, respectively. Fatigue cracks found to be initiated from the subsurface of the specimens in the VHCF regime, especially at high stress ratios. Two modified fatigue life prediction models based on fatigue crack initiation mechanisms for Ti60 titanium alloy in the VHCF regime were developed which showed good agreement with the experimental data.
对Ti60钛合金进行了超声疲劳试验，在不同应力比下直至超高周疲劳（VHCF） regime，以研究其特性。S-N曲线呈现出连续下降趋势，在10次循环时，对应应力比R = -1、0.1和0.3的疲劳极限分别为400、144和130 MPa。发现在VHCF regime下疲劳裂纹从试样的次表面萌生，尤其是在高应力比时。基于VHCF regime下Ti60钛合金疲劳裂纹萌生机制，开发了两种改进的疲劳寿命预测模型，其与实验数据吻合良好。
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