2013 Fiscal Year Final Research Report

Thermo-elastoplastic constiturive modelling considering phase transformation and numeriacl simulation of hot stamping process

Research Project

Project/Area Number	23560116
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Multi-year Fund
Section	一般
Research Field	Production engineering/Processing studies
Research Institution	Tokyo University of Agriculture and Technology
Principal Investigator	NAGAKI Shigeru 東京農工大学, 工学(系)研究科(研究院), 教授 (30135959)
Co-Investigator(Kenkyū-buntansha)	OSHITA Kenichi 東京農工大学, 大学院工学研究院, 助教 (60334471)
Project Period (FY)	2011 – 2013
Keywords	変態塑性 / 熱弾塑性構成式 / マルテンサイト変態 / パーライト変態 / 変態塑性係数 / ホットプレス
Research Abstract	In order to establish the simulation method for hot stamping process, the deformation behavior of steels accompanied by phase transformation were measured under bi-axial stress state. It was found that the transformation plastic deformations during pearlite transformation of S45C are different in tension and compression stress state. The proposed new constitutive equation for TRIP can predict these anisotropic deformation behavior. The bending test method to measure the TRIP coefficient was also established and the pre-plastic deformation prior to phase transformation will give the enormous effects to the TRIP deformation. Furthermore, the new constitutive equation was introduced to the commercial FE code and the bending deformation during the cooling process was simulated by proposed method.