Yoshida F, Uemori T, Fujiwara K (2002) Elastic-plastic behavior of steel sheets under in-plane cyclic tension-compression at large strain. Ziegler H (1959) A modification of Prager’s hardening rule. Prager W (1956) A new method of analyzing stresses and strains in work hardening solids. Proc R Soc Lond A 193:281–297īarlat F, Lege DJ, Brem JC (1991) A 6-component yield function for anisotropic materials. Hill R (1948) A theory of yielding and plastic flow of anisotropy metals. Gotoh M (1977) Theory of plastic anisotropy based on a yield function of 4th order (plane stress state). Yoshida F, Hamasaki H, Uemori T (2013) A user-friendly 3D yield function to describe anisotropy of steel sheets. Kardes N, Mete O, Demiralp Y, Choi C, Altan T (2012) Springback prediction in bending of AHSS-DP780. in: International automotive body congress (IABC). Kim K, Kimchi M, Altan T (2009) Control of springback in bending and flanging advanced high strength steels (AHSS). Vallelano C, Morales D, García-Lomas F (2008) On the study of the effect of bending in the formability of metal sheets. Huang YM, Chen T (2005) Influence of blank profile on the V-die bending camber process of sheet metal. In: Proceedings of the TICME2007 conference. Future work includes residual stress predictions for different forming processes.įarsi MA, Arezoo B (2007) Experimental and numerical study on the influence of die width and component material on spring-back and bending force of V-shape dies. Also, it was proved that ESPI is a powerful technique to measure the residual stress on complex surfaces, as the ones typically encountered in sheet forming processes. Nevertheless, residual stress calculations show a good correlation with experimental values. Results indicate that advanced hardening models are necessary to increase the accuracy of springback predictions. Work-hardening and anisotropy parameters, used in simulations, are experimentally determined by the uniaxial tensile test. Experiments are compared with Finite Element calculations in terms of punch force, springback angle and residual stresses. Residual stresses are measured after springback on specimens used in three-point bending tests where three bending angles are considered.
This paper aims to evaluate the use of the Electronic Speckle Pattern Interferometry (ESPI) technique to measure residual stresses on TRIP steel.
Thus, being able to either calculate or measure such stresses is of great importance. In sheet metal forming, residual stresses are related to springback and material failure after the deformation process or during service due to load history.