Effect of constraint on fracture performance of Ti6Al4V alloy fabricated by laser powder bed fusion

被引：2
作者：
Xiao, Yingmeng [1 ,2 ]
Sun, Jingyu. [1 ]
Qian, Guian [1 ]
机构：
[1] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech LNM, Beijing 100190, Peoples R China
[2] Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
来源：
THEORETICAL AND APPLIED FRACTURE MECHANICS | 2024年 / 131卷
基金：
中国国家自然科学基金;
关键词：
Laser powder bed fusion; Fracture property; Constraint effect; Ti6Al4V alloy; K-T-11-T-33; method; OF-PLANE CONSTRAINT; CRACK BORDER FIELD; TRIAXIALITY PARAMETER; METALLIC COMPONENTS; FATIGUE RESISTANCE; STRESS-FIELDS; TOUGHNESS; INPLANE; FAMILY; GROWTH;
D O I：
10.1016/j.tafmec.2024.104459
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
Laser powder bed fusion (LPBF) is increasingly being used as an alternative to traditional manufacturing in the aerospace and biomedical industries. The effect of constraint on fracture performance is a crucial issue in assessing the integrity of engineering applications. This paper aims to better understand the fracture performance of Ti6Al4V components with different constraint levels produced by LPBF. Fracture toughness tests were performed on compact tensile (CT) specimens with varying crack length and specimen thickness. The results show that the fracture toughness decreases with increasing crack length, while the fracture toughness shows a large fluctuation with specimen thickness because of LPBF manufacturing defects. Both in-plane and out-of-plane constraint effects of a crack subjected to mode-I loading are analyzed by three-parameter K-T11-T33 method. A correlation line between fracture toughness and normalized T11 stress is established, which can be used to transform fracture properties of specimens with different constraint levels.
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页数：11
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