A novel finite element simulation of hot stamping process of DP780 steel based on the Chaboche thermomechanically harden
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ORIGINAL ARTICLE
A novel finite element simulation of hot stamping process of DP780 steel based on the Chaboche thermomechanically hardening model Hamid Hajbarati 1 & Asghar Zajkani 1 Received: 28 May 2020 / Accepted: 19 October 2020 / Published online: 2 November 2020 # Springer-Verlag London Ltd., part of Springer Nature 2020
Abstract Advanced high-strength steels (AHSS) despite excellent properties with low weight and high strength have the concern of high springback occurrence. The amount of springback can be reduced by hot forming process. In this paper, the influence of temperature rises on the springback quantities generated potentially during a hot stamping process of the DP780 steel is investigated. To obtain a proper description for hardening behavior, a type of the Chaboche thermomechanically constitutive model has been used in conjunction with an anisotropic Yld2000-2D yield criterion. Since the elastic modulus of the AHSS during loading and unloading stages can make considerable influences on the springback, consideration of Young’s modulus as a function of equivalent plastic strain is necessary. Moreover, the process is simulated via ABAQUS software implementing UMAT and VUMAT user-defined subroutines as well as the forward Euler explicit integration scheme is applied to calculate the stress and strain at the end of time increments. The results demonstrate the efficiency of the novel temperature-dependent Chaboche model to predict the level of stresses and temperature during and after hot stamping process. Keywords Temperature-dependent Chaboche model . Hot stamping . Springback . Advanced high-strength steel . Finite element simulation
1 Introduction Nowadays, particular characteristics of advanced highstrength steel (AHSS) alloys due to their high strength and low weight have motivated engineering to apply them in different apparatuses. In the past decade, these interests have been rapidly grown up in such a way that a large number of researchers have investigated different mechanical aspects of these alloys. Recently, Martínez-Palmeth et al. [1] presented an experimental and numerical analysis of the formability of high-strength H240LA steel sheets. Also, Zhang et al. [2] introduced an inverse identification of the post-necking work hardening behavior of thick HSS through full-field strain measurements during diffuse necking. Experimental response of high-strength steels to localized blast loading is given in [3]. He et al. [4] expressed a rate and temperature-dependent unified creep-plasticity model. They reported the temperature
* Asghar Zajkani [email protected] 1
Department of Mechanical Engineering, Imam Khomeini International University, Qazvin, Iran
function, drag stress evolution function, and the adjustment equations to be determined. On contrary, one of the disadvantages of these alloys is its high springback which is arisen from the Bauschinger effect of hardening mechanisms during forward loading and reverse unloading processes [5]. Some general-related considerations around th
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