Fatigue limit prediction of cracked and notched specimens related to grain size

被引：0

作者：

Zhang, Chunguo ^{[1
,3
]}

Yang, Shuangge ^{[1
]}

Dong, Yuanzhe ^{[1
]}

Mu, Shengyong ^{[2
]}

Li, Hongchang ^{[2
]}

Zhang, Jianlong ^{[2
]}

机构：

[1] Chang An Univ, Key Lab Rd Construct Technol & Equipment, MOE, Xian 710064, Peoples R China

[2] Xian Special Equipment Inspect Inst, Xian 710065, Peoples R China

[3] Chang An Univ, Middle Sect Nan Er Huan Rd, Xian 710064, Peoples R China

来源：

INTERNATIONAL JOURNAL OF FATIGUE | 2023年 / 177卷

基金：

中国国家自然科学基金;

关键词：

Fatigue limit; Notch geometry; Grain size; Normal distribution; Stress concentration factor; CYCLE FATIGUE; STRESS; STRENGTH; FRACTURE; SENSITIVITY;

D O I：

10.1016/j.ijfatigue.2023.107905

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Fatigue behavior of specimens is influenced by crack/notch geometry and material properties. Here, a unified fatigue limit model is proposed to describe notch geometry and grain size (G) influences by analyzing fatigue measurements on specimens from 11 kinds of metals (G = 6 to 120 mu m) and containing defects (crack, U-notch, sharp and blunt V-notches). Based on Atzori-Lazzarin diagram, fatigue limit of notched specimens (crack is special notch) is linked to notch depth, root radius and opening angle, and the intersections in the diagram are related to G. Additionally, inevitable fatigue-limit scatter is quantified by incorporating normal distribution theory. Results show that proposed model with 96% reliability can predict fatigue limits of different-metal specimens with various defects.

引用

页数：10

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