Modeling of Multi-scale Fatigue Crack Growth in Titanium Alloy TC4

被引：3
|
作者：
Zhu, L. [1 ]
Song, Y. D. [2 ]
Chen, J. [1 ]
机构：
[1] Changsha Univ Sci & Technol, Sch Energy & Power Engn, Changsha, Hunan, Peoples R China
[2] Nanjing Univ Aeronaut & Astronaut, Coll Energy & Power Engn, Nanjing, Jiangsu, Peoples R China
来源：
IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY-TRANSACTIONS OF MECHANICAL ENGINEERING | 2021年 / 45卷 / 01期
关键词：
Small fatigue crack; Crack growth rate; Fatigue life; Multi-scale model; Titanium alloy; HIGH-CYCLE FATIGUE; STRESS; BEHAVIOR; PREDICTION; DISCONTINUITIES; PROPAGATION; INITIATION; THRESHOLD; FRACTURE; EQUATION;
D O I：
10.1007/s40997-020-00359-4
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
A modified multi-scale fatigue crack growth rate model for titanium alloy TC4 is provided in this investigation. The model gives a unified expression to evaluate the crack growth rate from MSC to LC stage by incorporating the effects of crack closure, large-scale yielding, and microstructural dissimilitude on crack growth behavior. Results show that the present model is able to describe the multi-scale crack growth rate for titanium alloy TC4. The model concurrently considers the grain size distribution and can reflect the large fluctuation of small-crack growth rate to some extent. Additionally, through integrating the multi-scale crack growth rate model, the crack growth life of TC4 can also be evaluated. The present model has a good prediction ability for the crack growth life and the residual fatigue life of TC4.
引用
收藏
页码：153 / 163
页数：11
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