Thermo-mechanical modeling of thermal stress in metal additive manufacturing considering elastoplastic hardening

被引：39
|
作者：
Mirkoohi, Elham [1 ]
Sievers, Daniel E. [2 ]
Garmestani, Hamid [3 ]
Liang, Steven Y. [1 ]
机构：
[1] Georgia Inst Technol, Woodruff Sch Mech Engn, Atlanta, GA 30332 USA
[2] Boeing Res & Technol, Ceram Extreme Environm & Met, Huntsville, AL 35824 USA
[3] Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA
来源：
CIRP JOURNAL OF MANUFACTURING SCIENCE AND TECHNOLOGY | 2020年 / 28卷
关键词：
Elastoplastic hardening analysis; Metal additive manufacturing; Thermal stress; Temperature prediction; Finite element modeling; Analytical modeling; POWDER BED FUSION; RESIDUAL-STRESSES; MELT POOL; LASER; GEOMETRY; TI-6AL-4V;
D O I：
10.1016/j.cirpj.2020.01.002
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The build-up of thermal stress induced by a high-temperature gradient in an additively manufactured part during laser metal additive manufacturing provides significant limitations to the adoption of this process since thermal stress may induce high tensile residual stress and part distortion in the additively manufactured parts. Herein, a thermomechanical analytical model is proposed to predict the in-process elastoplastic hardening thermal stress and strain for single-track scan strategy. The thermal model is validated using experimental results of melt pool geometry. Also, finite element simulation is performed to validate the proposed elastoplastic hardening thermal stress model of the same problem. (C) 2020 CIRP.
引用
收藏
页码：52 / 67
页数：16
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