Microstructural investigation and model of fatigue short crack in EH36 steels

被引：9

作者：

Su, Molin ^{[1
,2
]}

Xu, Lianyong ^{[1
,2
]}

Feng, Chao ^{[1
,2
]}

Han, Yongdian ^{[1
,2
]}

Zhao, Lei ^{[1
,2
]}

Xiao, Guangchun ^{[3
]}

机构：

[1] Tianjin Univ, Sch Mat Sci & Engn, Tianjin 300350, Peoples R China

[2] Tianjin Key Lab Adv Joining Technol, Tianjin, Peoples R China

[3] Qilu Univ Technol, Sch Mech Engn, Jinan, Peoples R China

来源：

FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES | 2022年 / 45卷 / 08期

基金：

中国国家自然科学基金;

关键词：

dislocation density; fatigue fracture; short crack; stress intensity factor; GROWTH; BEHAVIOR; INITIATION; EVOLUTION; ORIENTATION; CLOSURE; ALLOY; METAL;

D O I：

10.1111/ffe.13731

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

For better revealing the behavior and mechanism of fatigue short crack (SC) propagation, five different kinds of notched samples were designed. Based on the crack growth rate-SC length map, finite element method and electron backscatter diffraction (EBSD) pattern, the evolution theory of geometrically necessary dislocation density (rho(GND)) versus SC length was proposed to distinguish the physically short crack (PSC) length; Schmid factor was utilized to define the length of microstructurally short crack (MSC). Thus, the whole SC growth was divided into three parts: MSC, transition zone and PSC. Finally, an original piecewise model containing two parameters was proposed to describe the whole SC growth of EH36 steels.

引用

页码：2227 / 2242

页数：16

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