基于微结构演化的金属材料物理型塑性本构模型研究

项目名称： 基于微结构演化的金属材料物理型塑性本构模型研究

项目编号： No.U1330116

项目类型： 联合基金项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 尚福林

作者单位： 西安交通大学

项目金额： 80万元

中文摘要： 针对NSAF“培育项目”的明确目标课题―6. 基于微结构演化的金属材料物理型塑性本构模型研究，本项目拟借鉴采用微纳米材料力学行为研究中日益盛行、新颖的微小试样加载测试方法，选取中物院现阶段主体研究比较关注的奥氏体不锈钢和钒合金，开展金属材料塑性变形行为的实验测试和理论建模研究，提出更加准确可靠的基于位错相互作用、微结构演化的隐式物理型本构模型，并给出正确高效的求解方法和数值分析程序。通过本项目研究与合作，一方面深化对微结构演化影响材料塑性本构模型的机理认识，使中物院建立微结构演化的微尺度实验手段和实验方法；另一方面，完善微结构演化与塑性行为关系的系统研究，促进中物院掌握相关的数值分析方法，为中物院总体工程研究所进行更深入的多尺度研究和工程模拟计算奠定良好的基础。

中文关键词： HR2合金；V-5Cr-5Ti合金；塑性；位错；微结构演化

英文摘要： Aiming to NSAF Breeding Project Guideline No.6 - "A microstructure evolution based physical constitutive model for metals", This Application will utilize the novel testing method of miniaturized specimen, which is increasingly adopted in the research area of mechanical behaviors of micro and nano-materials. Two alloys, i.e. austenitic stainless steel and vanadium alloy, will be the target materials to address, as currently CAEP pays more research focus on them. Firstly, experimental investigations on their plastic deformation behavior will be performed. Secondly, theoretical modeling is to be carried out in order to develop more accurate constitutive models based on dislocation interactions and micro-structure evolution features, so called explicit physically based constitutive models. In addition, numerically efficient methods for predicting the plastic response of the alloys will be proposed. Through this NSAF project, a deeper understanding is expected on how the micro-structure evolution influences the plastic deformation mechanisms of the alloys, and related experimental method using small-sized specimens could be provided to CAEP. All the efforts will lay solid foundations and provide a better support for the CAEP applications on multi-scale modeling and engineering simulations.

英文关键词： HR2 alloy；V-5Cr-5Ti alloy；plasticity；dislocation；microstructural evolution