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Technical Brief

Bridging length scales in the analysis of transient tests for metallic materials

[+] Author and Article Information
Aditya Gokhale

Applied Mechanics, Indian Institute of Technology Delhi, New Delhi 110016, India
amz148021@am.iitd.ac.in

Krishnaswamy Hariharan

Mechanical Engineering, Indian Institute of Technology Madras, Chennai 600036, India
hariharan@iitm.ac.in

Jayant Jain

Applied Mechanics, Indian Institute of Technology Delhi, New Delhi 110016, India
jayantj@iitd.ac.in

Rajesh Prasad

Applied Mechanics, Indian Institute of Technology Delhi, New Delhi 110016, India
rajesh@am.iitd.ac.in

Heung Nam Han

Seoul National University and Research Institute of Advanced Materials, Seoul 08826, Republic of Korea
hnhan@snu.ac.kr

1Corresponding author.

ASME doi:10.1115/1.4040671 History: Received August 18, 2017; Revised June 21, 2018

Abstract

The transient data obtained during stress relaxation test of polycrystalline materials has broader implications. The test is influenced by the material length scale. Efforts to mathematically bridge data at different length scales is scarce. In the present work, it is attempted to modify a recently proposed stress relaxation model with additional coefficients to accommodate the mechanical behaviour at different length scales. The macro scale stress relaxation test was performed using a tensile testing machine whereas the micro and nano scale specimens were tested using indentation technique. Assuming power law rate behaviour, a scaling relation is derived initially to correlate the indentation pressure and flow stress.

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