Fatigue life prediction of TC17 titanium alloy based on micro scratch

被引：22
作者：
Ding, M. C. [1 ]
Zhang, Y. L. [1 ]
Lu, H. T. [2 ]
机构：
[1] Dalian Univ Technol, Sch Mech Engn, Dalian 116023, Liaoning, Peoples R China
[2] South Dakota State Univ, Coll Engn, Brookings, SD 57007 USA
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2020年 / 139卷
基金：
中国国家自然科学基金;
关键词：
TC17 titanium alloy; Micro scratch; Fatigue damage parameter; High cycle fatigue life; HIGH-STRENGTH STEELS; HIGH-CYCLE FATIGUE; SURFACE-ROUGHNESS; CRACK INITIATION; RESIDUAL-STRESS; INCLUSION SIZE; SMALL DEFECT; BEHAVIOR; FAILURE; TOLERANCE;
D O I：
10.1016/j.ijfatigue.2020.105793
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
Micro scratch with depth and width of micron expresses a significant influence on fatigue life. However, little literature is available on modelling the effect of micro scratch on the fatigue life of TC17 titanium alloy. In this paper, the geometric characteristics of micro scratch, especially depth and width, were obsevered and measured. Then, fatigue experiment was conducted to obtain the corresponding fatigue test data. Result shows the presence of micro scratches dramatically reduced the fatigue life from very high cycle fatigue (VHCF) to the high cycle fatigue (HCF) regime. According to the geometrical characteristics of micro scratch, two principles of no obvious influence of scratch direction and length on fatigue life was proposed based on Murakami theory. A new parameter area. is proposed to describe fatigue damage quantitatively caused by micro scratches, which is defined as the square root of triangle area of scratch section. An HCF life model of TC17 with the consideration of micro scratches is established by the combined application of area. and Paris formula. The validity of the model is confirmed by a good agreement between predicted and experimental results.
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页数：10
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