Fatigue Strength of TC18 Titanium Alloy Forgings with Different Stress Concentrations and Stress Ratios

被引：0
|
作者：
Sun Y. [1 ]
Liu Y. [1 ]
Zhang J. [1 ]
Wang M. [1 ]
Li J. [1 ]
机构：
[1] School of Metallurgical Engineering, Xi'an University of Architecture & Technology, Xi'an
来源：
Xiyou Jinshu/Chinese Journal of Rare Metals | 2019年 / 43卷 / 07期
关键词：
Fatigue strength; MATLAB/GUI; Stress concentration; Stress ratio; TC18; titanium;
D O I：
10.13373/j.cnki.cjrm.XY18040024
中图分类号：
学科分类号：
摘要：
Under different stress concentration factors (Kt) and stress ratios (R), the characteristics of fatigue strength of TC18 titanium alloy forgings were investigated. In addition, the S-N (strain-life) curves and fracture morphology of two kinds of alloy were analyzed. The results showed that the S-N curves showed distinct variations under different stress concentration factors and stress ratios. The stress concentration not only affected the three typical fatigue fracture areas, but also affected the microscopic shape of fatigue striations, secondary cracks and dimples. In order to further illustrate the comprehensive effect of stress concentration and stress ratio on fatigue strength of TC18 forgings, two kinds of sensitivity factors qf' and M' were re-established, based on the traditional stress concentration sensitivity factors qf and mean stress sensitivity factor M. And a new model for the stress concentration and stress ratio on fatigue strength of TC18 forgings was established. By calculation, the data obtained with the new model had a good agreement with the experimental results. Finally, the differences between the new model and the traditional model were compared by MATLAB/GUI. The results showed that the new model curve was found between the traditional three model curves, and the new model had the highest degree of matching for the smooth samples, which further validated the accuracy of the new model. © Editorial Office of Chinese Journal of Rare Metals. All right reserved.
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页码：699 / 705
页数：6
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