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research-article

Influence of Inhomogeneous Deformation on Tensile Behavior of Sheets Processed through Constrained Groove Pressing

[+] Author and Article Information
Sunil Kumar

IIT Delhi New Delhi, 110016 India sunil30111988@gmail.com

S Venkatachalam

IIT Madras Chennai, Tamilnadu 600036 India aerovenkat74@gmail.com

Krishnaswamy Hariharan

INDIAN INSTITUTE OF TECHNOLOGY MADRAS Chennai, 600036 India harikmail@gmail.com

Digavalli Ravi Kumar

Hauz Khas, New Delhi New Delhi New Delhi, 110016 India dravi@mech.iitd.ac.in

HSN Murthy

Indian Institute Of Technology Chennai, 600036 India hsnmurthy@gmail.com

1Corresponding author.

Contributed by the Materials Division of ASME for publication in the Journal of Engineering Materials and Technology. Manuscript received November 29, 2018; final manuscript received April 3, 2019; published online xx xx, xxxx. Assoc. Editor: Huiling Duan.

ASME doi:10.1115/1.4043492 History: Received November 29, 2018; Accepted April 08, 2019

Abstract

Constrained groove pressing (CGP) is a severe plastic deformation technique to produce the ultra-fine grained sheet. The inhomogeneous strain distribution and geometry variation induce differential mechanical properties in the processed sheet. The improved mechanical properties of CGP sheets is due to the composite effect of weak and strong regions formed by geometric and strain inhomogenities. Weaker regions exhibit large strain, lower yield strength and higher strain hardening compared to that of stronger regions. Estimation of mechanical properties is influenced by these defects leading to the difference in the mechanical properties along different orientations. Experimental investigation revealed that the commonly used tensile samples cut perpendicular to the groove orientation exhibit variation in thickness along the gauge length affecting the results from tensile tests. To further understand the effect of geometric variation, a typical CGP specimen was reverse engineered and finite element (FE) simulation was performed using the actual geometry of the CGP processed specimen. The strain distribution from FE simulation was validated experimentally using digital image correlation data. Based on the numerical and experimental studies, miniature specimens were designed to eliminate the geometric effects from the standard parallel specimen. Miniature parallel specimens showed lower yield strength and total elongation compared to standard specimen. However, the statistical scatter of total elongation of the miniature specimens was much less than that of standard specimens, indicating better repeatability. This study is probably the first to quantify the contribution of composite geometric effect in the mechanical properties of CGP.

Copyright © 2019 by ASME
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