Variation of elastic modulus during plastic deformation and its influence on springback

Abstract Inelastic recovery behavior of TRIP steels during unloading has been investigated by uniaxial tensile tests. Unloading stress–strain curves obtained under different plastic strain indicated that the percentage of inelastic recovery to the total recovery increased with plastic deformation. An empirical expression describing the relation of elastic modulus with plastic strain has been proposed. Then the expression was implemented into LS-DYNA software to simulate U-channel springback. Comparison showed that springback simulation with a varied elastic modulus was more precise than that with a constant elastic modulus. Inelastic recovery needs be considered in order to improve springback simulation precision.

[1]  Peter Hodgson,et al.  Experimental and numerical studies of springback in air v-bending process for cold rolled TRIP steels , 2006 .

[2]  Fabrice Morestin,et al.  On the necessity of taking into account the variation in the Young modulus with plastic strain in elastic-plastic software , 1996 .

[3]  A. Andersson Numerical and Experimental Evaluation of Springback in Advanced High Strength Steel , 2007 .

[4]  José María Manero,et al.  Change of Young’s modulus of cold-deformed pure iron in a tensile test , 2005 .

[5]  R. H. Wagoner,et al.  Microstructural effects on the springback of advanced high-strength steel , 2006 .

[6]  Sunghak Lee,et al.  Effects of volume fraction and stability of retained austenite on formability in a 0.1C–1.5Si–1.5Mn–0.5Cu TRIP-aided cold-rolled steel sheet , 2004 .

[7]  F. LePera Improved Etching Technique to Emphasize Martensite and Bainite in High-Strength Dual-Phase Steel , 1980 .

[8]  A. Ghosh,et al.  Inelastic effects on springback in metals , 2002 .

[9]  Zhong-qin Lin,et al.  The effect of strain-induced martensitic transformation on mechanical properties of TRIP steel , 2008 .

[10]  Jun Bao,et al.  Effect of the material-hardening mode on the springback simulation accuracy of V-free bending , 2002 .

[11]  Amit K. Ghosh,et al.  Elastic and Inelastic Recovery After Plastic Deformation of DQSK Steel Sheet , 2003 .

[12]  C. F. Jatczak Retained Austenite and Its Measurement by X-Ray Diffraction , 1980 .

[13]  Fusahito Yoshida,et al.  Elastic-plastic behavior of steel sheets under in-plane cyclic tension-compression at large strain , 2002 .

[14]  Y. Akiyama,et al.  Microscopic Evaluation of Change in Springback Characteristics Due to Plastic Deformation , 2004 .

[15]  R. Perez,et al.  Study of the Inelastic Response of TRIP Steels after Plastic Deformation , 2005 .

[16]  Mitsuyuki Kobayashi,et al.  Effects of Volume Fraction and Stability of Retained Austenite on Ductility of TRIP-aided Dual-phase Steels , 1992 .

[17]  H. Ledbetter,et al.  Low temperature elastic constants of deformed polycrystalline copper , 1988 .