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Interface driven optimisation of springback in stretch bending of autobody panels

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Author(s): G.S. Hegde | J. Shivaprasad | R. Sridhar

Journal: Archives of Computational Materials Science and Surface Engineering
ISSN 1689-9210

Volume: 1;
Issue: 3;
Start page: 168;
Date: 2009;
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Keywords: Springback | Optimization | Elsato-plastic relation | Interface theory

ABSTRACT
Purpose: Analytical determination of springback in the stretch bending of autobody double curved panels and optimization of parameters like yield strength and thickness of plate, have been the prime purposes of this paper.Design/methodology/approach: The elasto plastic behaviour governed by Hooke’s law and Holomann’s law, has been solved using interface theory, the original contribution of author. In the process Hegde’s interface modulus has been coined, which depends on both modulus of elasticity and the plastic coefficient.Findings: The linearized functions of change of springback and stretch tension are solved for optimization, again using interface theory briefed in the Appendix.Practical implications: The published models of springback optimization being complicated, a need has been felt to formulate computationally easy and confidently accurate model of springback determination. The theoretical deliberations are demonstrated on materials based on the data obtained from the published references.Originality/value: The authors are confident of the originality and do claim authentically the novelty in the workout of the analysis. The interface theory applied at several stages in the analysis gives the optimal solutions to variables in the hyperspace defined by a linear system with redundancy in unknown variables.
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