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A correction method of elastic modulus in compression tests for linear hardening materials

Published online by Cambridge University Press:  21 December 2015

Wei Liu ,
Yong Huan ,
Jie Dong ,
Yujing Dai  and
Ding Lan
Wei Liu
Affiliation:
State Key Laboratory of Nonlinear Mechanics (LNM), Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China Key Laboratory of Microgravity (National Microgravity Laboratory), Institute of Mechanics, Chinese Academy of Sciences (CAS), Beijing 100190, China
Yong Huan*
Affiliation:
State Key Laboratory of Nonlinear Mechanics (LNM), Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
Jie Dong
Affiliation:
State Key Laboratory of Nonlinear Mechanics (LNM), Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
Yujing Dai
Affiliation:
State Key Laboratory of Nonlinear Mechanics (LNM), Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
Ding Lan
Affiliation:
Key Laboratory of Microgravity (National Microgravity Laboratory), Institute of Mechanics, Chinese Academy of Sciences (CAS), Beijing 100190, China
*
Address all correspondence to Yong Huan athuany@lnm.imech.ac.cn
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Abstract

A correction method for linear hardening materials is brought forward to obtain the true (or nearly true) modulus of cylindrical specimens with middle aspect ratios in compression tests. By considering the stress concentration near the interface between the specimen and the compression platen caused by slanted contact, a “sandwich” model is developed. A correction formula is derived and all parameters can be obtained from the tested stress–strain curve. Experiments were performed on Al 2024 specimens with four aspect ratios. The corrected results are closer to the intrinsic modulus than the tested values, which verify the effectiveness of the correction method.

Type
Research Letters
Information
MRS Communications , Volume 5 , Issue 4 , December 2015 , pp. 641 - 645
Copyright
Copyright © Materials Research Society 2015 

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