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research-article

Determination of the flow stress?strain curve of aluminum alloy and tantalum using the load?displacement curve of a hat-type specimen in compression testing

[+] Author and Article Information
Jae-Ha Lee

Mechanics of Materials and Design Laboratory, Department of Materials Engineering, Gangneung-Wonju National University, Gangneung, Gangwon-do 25457, Republic of Korea
jh_lee@gwnu.ac.kr

Hyunho Shin

Mechanics of Materials and Design Laboratory, Department of Materials Engineering, Gangneung-Wonju National University, Gangneung, Gangwon-do 25457, Republic of Korea
hshin@gwnu.ac.kr

Jong-Bong Kim

Computational Mechanics and Design Laboratory, Department of Mechanical and Automotive Engineering, Seoul National University of Science and Technology, Nowon-gu, Seoul 01811, Republic of Korea
jbkim@seoultech.ac.kr

Ju-Young Kim

Poongsan Defense R&D Institute, Yuseong-gu, Daejeon, 34027, Republic of Korea
kimju0@poongsan.co.kr

Sung-Taek Park

Poongsan Defense R&D Institute, Yuseong-gu, Daejeon, 34027, Republic of Korea
stpark81@poongsan.co.kr

Gwang-Lyeon Kim

Poongsan Defense R&D Institute, Yuseong-gu, Daejeon, 34027, Republic of Korea
kgl0021@poongsan.co.kr

Kyeongwon Oh

Defense Industry Technology Center, Yongsan-gu, Seoul 04353, Republic of Korea
kyeongwonoh@add.re.kr

1Corresponding author.

ASME doi:10.1115/1.4042138 History: Received September 15, 2018; Revised November 22, 2018

Abstract

The load-displacement curves of an aluminum alloy and tantalum were determined using a hat-type specimen in the compression test. Based on the results of finite element analysis, the employed geometry of the hat-type specimen was found to yield a load-displacement curve that is nearly independent of the friction between the specimen and platen. The flow stress-strain curves of the alloy and tantalum were modelled using the Ludwik and Voce constitutive laws, respectively; furthermore, simulation of the compression event of the hat-type specimen was performed by assuming appropriate constitutive parameters. The constitutive parameters were varied via an optimization function built in MATLAB until the simulated load-displacement curves reasonably fit the experimental curve. The optimized constitutive parameters obtained in this way were then used to construct friction-free flow stress-strain curves of the two materials.

Copyright (c) 2018 by ASME
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