权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Multiscale Model of Transformation Induced Plasticity and its Application to Morphogenesis with High Functional

相变诱导可塑性的多尺度模型及其在高功能形态发生中的应用

基本信息

批准号：
14350059
负责人：
TOMITA Yoshihiro
金额：
$ 9.09万
依托单位：
Kobe University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

项目摘要

Transformation induced plasticity (TRIP) models have been developed on the basis of probability of cross slip in the austenite matrix, which is dominated by the thermal fluctuation and accounting for the crystalline structure of both phases. The transformation models were introduced to crystalline plasticity theory to develop a constitutive equation account for the transformation in crystalline scale. The validity of the proposed constitutive equations has been verified through the reproducibility of the transformation dependent on the strain rate, temperature, stress, carbon content and crystalline structure. It is also revealed that the formability of the TRIP steel can be substantially improved without remarkable loss of stiffness by controlling the deformation process precisely. Then the constitutive equations are encoded in the finite element / finite element homogenization methods to establish a new simulation method for a finding of a forming process which saves energy effectively. The method is not applied to real forming process but to simple cases ; however, it suggests that a suitable control of temperature improves the formability without substantial loss of stiffness, and that the forming limit is able to improve when the microstructure of TRIP steels is artificially introduced and controlled. Furthermore, a microscopic model based on the molecular dynamic method and lattice instability concept has been developed for the evaluation of molecular scale transformation.

相变诱发塑性（TRIP）模型已开发的基础上，在奥氏体基体中的交叉滑移的概率，这是由热波动和占两相的晶体结构占主导地位。将相变模型引入到晶体塑性理论中，建立了考虑晶体尺度相变的本构方程。所提出的本构方程的有效性已被验证，通过依赖于应变速率，温度，应力，碳含量和晶体结构的转换的再现性。通过精确控制变形过程，可以在不损失刚度的情况下显著改善TRIP钢的成形性能。然后将本构方程编码到有限元/有限元均匀化方法中，建立了一种新的模拟方法，以寻找一种有效节能的成形工艺。该方法不适用于真实的成形过程，但简单的情况下，然而，它表明，一个适当的温度控制改善了成形性，而没有实质性的刚度损失，和成形极限是能够改善时，TRIP钢的显微组织是人为引入和控制。此外，基于分子动力学方法和晶格不稳定性概念的微观模型已被开发的分子尺度转换的评估。