Elastic Modulus Model Based on Dislocation Density and its Application on Aluminum Alloy 5052

An elastic modulus model is proposed to describe the phenomenon of the material’s elastic modulus varying with plastic strain. This elastic modulus model is theoretically interpreted using the dislocation density as an internal variant. Loading-unloading-reloading (LUR) tensile tests have been implemented to analyze the non-linear unloading behavior. The maximum decrease of the elastic modulus of AA5052 is approximately 16%. The proposed model is introduced into the springback simulation of U-bending. The results showed that the contour of springback simulation with the proposed elastic modulus model is closer to that of the experimental data than results of constant elastic modulus simulation. Error in the springback simulation with the proposed elastic modulus model can be reduced by up to 20% compared with that predicted with a constant elastic modulus.

[1]  Ji Hoon Kim,et al.  Evaluating the significance of hardening behavior and unloading modulus under strain reversal in sheet springback prediction , 2013 .

[2]  Joseba Mendiguren,et al.  An extended elastic law to represent non-linear elastic behaviour: Application in computational metal forming , 2013 .

[3]  F. Barlat,et al.  Nonlinear elastic behaviors of low and high strength steels in unloading and reloading , 2013 .

[4]  Xia Jin,et al.  Prediction of Springback of the One-Axle Rotary Shaping Based on Artificial Neural Network , 2013 .

[5]  J. Mendiguren,et al.  Strain path′s influence on the elastic behaviour of the TRIP 700 steel , 2013 .

[6]  Suwat Jirathearanat,et al.  Experimental and numerical investigation of springback effect for advanced high strength dual phase steel , 2012 .

[7]  Kjell Mattiasson,et al.  On constitutive modeling for springback analysis , 2010 .

[8]  H. Yu,et al.  Variation of elastic modulus during plastic deformation and its influence on springback , 2009 .

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

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

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

[12]  Fusahito Yoshida,et al.  A Model of Large-Strain Cyclic Plasticity and its Application to Springback Simulation , 2002 .

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

[14]  Fusahito Yoshida,et al.  A model of large-strain cyclic plasticity describing the Bauschinger effect and workhardening stagnation , 2002 .

[15]  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 .

[16]  K. Krausz,et al.  Unified constitutive laws of plastic deformation , 1996 .

[17]  U. F. Kocks,et al.  Kinetics of flow and strain-hardening☆ , 1981 .

[18]  U. F. Kocks.  Laws for Work-Hardening and Low-Temperature Creep , 1976 .

[19]  J. Friedel.  XLVI. Anomaly in the rigidity modulus of copper alloys for small concentrations , 1953 .

[20]  N. Mott.  CXVII. A theory of work-hardening of metal crystals , 1952 .