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 inhomogeneities. Weaker regions exhibit large strain, lower yield strength, and higher strain hardening compared to stronger regions. The 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 the 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 the standard specimens. However, the statistical scatter of total elongation of the miniature specimens was much less than that of the standard specimens, indicating better repeatability. Probably this is the first study to quantify the contribution of composite geometric effect in the mechanical properties of CGP.
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October 2019
Research-Article
Influence of Inhomogeneous Deformation on Tensile Behavior of Sheets Processed Through Constrained Groove Pressing
Sunil Kumar,
Sunil Kumar
Department of Mechanical Engineering,
New Delhi 110016,
e-mail: mez158170@iitd.ac.in
Indian Institute of Technology Delhi
,New Delhi 110016,
India
e-mail: mez158170@iitd.ac.in
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S. Venkatachalam,
S. Venkatachalam
Department of Aerospace Engineering,
Chennai 600036, Tamil Nadu,
e-mail: aerovenkat74@gmail.com
Indian Institute of Technology Madras
,Chennai 600036, Tamil Nadu,
India
e-mail: aerovenkat74@gmail.com
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Hariharan Krishnaswamy,
Hariharan Krishnaswamy
1
Department of Mechanical Engineering,
Chennai 600036, Tamil Nadu,
e-mail: hariharan@iitm.ac.in
Indian Institute of Technology Madras
,Chennai 600036, Tamil Nadu,
India
e-mail: hariharan@iitm.ac.in
1Corresponding author.
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Ravi Kumar Digavalli,
Ravi Kumar Digavalli
Department of Mechanical Engineering,
New Delhi 110016,
e-mail: dravi@mech.iitd.ac.in
Indian Institute of Technology Delhi
,New Delhi 110016,
India
e-mail: dravi@mech.iitd.ac.in
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H. S. N. Murthy
H. S. N. Murthy
Department of Aerospace Engineering,
Chennai 600036, Tamil Nadu,
e-mail: mhsn@iitm.ac.in
Indian Institute of Technology Madras
,Chennai 600036, Tamil Nadu,
India
e-mail: mhsn@iitm.ac.in
Search for other works by this author on:
Sunil Kumar
Department of Mechanical Engineering,
New Delhi 110016,
e-mail: mez158170@iitd.ac.in
Indian Institute of Technology Delhi
,New Delhi 110016,
India
e-mail: mez158170@iitd.ac.in
S. Venkatachalam
Department of Aerospace Engineering,
Chennai 600036, Tamil Nadu,
e-mail: aerovenkat74@gmail.com
Indian Institute of Technology Madras
,Chennai 600036, Tamil Nadu,
India
e-mail: aerovenkat74@gmail.com
Hariharan Krishnaswamy
Department of Mechanical Engineering,
Chennai 600036, Tamil Nadu,
e-mail: hariharan@iitm.ac.in
Indian Institute of Technology Madras
,Chennai 600036, Tamil Nadu,
India
e-mail: hariharan@iitm.ac.in
Ravi Kumar Digavalli
Department of Mechanical Engineering,
New Delhi 110016,
e-mail: dravi@mech.iitd.ac.in
Indian Institute of Technology Delhi
,New Delhi 110016,
India
e-mail: dravi@mech.iitd.ac.in
H. S. N. Murthy
Department of Aerospace Engineering,
Chennai 600036, Tamil Nadu,
e-mail: mhsn@iitm.ac.in
Indian Institute of Technology Madras
,Chennai 600036, Tamil Nadu,
India
e-mail: mhsn@iitm.ac.in
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 May 9, 2019. Assoc. Editor: Huiling Duan.
J. Eng. Mater. Technol. Oct 2019, 141(4): 041007 (10 pages)
Published Online: May 9, 2019
Article history
Received:
November 29, 2018
Revision Received:
April 3, 2019
Accepted:
April 8, 2019
Citation
Kumar, S., Venkatachalam, S., Krishnaswamy, H., Digavalli, R. K., and Murthy, H. S. N. (May 9, 2019). "Influence of Inhomogeneous Deformation on Tensile Behavior of Sheets Processed Through Constrained Groove Pressing." ASME. J. Eng. Mater. Technol. October 2019; 141(4): 041007. https://doi.org/10.1115/1.4043492
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