基于微观晶相建模的双相钢吸能特性研究  

Research on Energy Absorption Characteristics of Dual-phase Steel Based on Micro-crystalline Phase Modeling

作　　者：庄蔚敏[1] 解东旋[1] 叶辉[1] 

机构地区：[1]吉林大学汽车仿真与控制国家重点实验室,长春130022

出　　处：《机械工程学报》2016年第4期120-125,共6页Journal of Mechanical Engineering

基　　金：国家自然科学基金(51375201);吉林省自然科学基金(20130101048JC)资助项目

摘　　要：基于Voronoi和概率分布理论,提出材料微观晶相建模方法及其实现流程,建立微观晶相可视化几何模型。通过将微观晶相生成系统和ABAQUS有限元软件相结合,实现了基于微观晶相建模的双相钢有限元仿真,仿真中单相铁素体及马氏体均采用理想弹塑性材料模型,同时,以延性损伤模型模拟材料的破坏行为。以该仿真模型为基础,建立一系列不同晶粒尺寸、不同马氏体体积分数的双相钢微观晶相仿真模型,进行双相钢吸能特性研究,研究表明虽然双相钢吸能量随晶粒尺寸的不同略有差异,但总体均随马氏体体积分数的增加呈现先上升后下降的趋势,最优吸能时双相钢中马氏体体积分数均在2%～5%范围内。实现了双相钢微观尺度下的吸能研究,为轻量化汽车车身安全件的选材提供指导。Based on the Voronoi tessellation and probability theories,a material modeling method of micro-crystalline phase and its realization process are proposed,and a visual geometric model of micro-crystalline phase is established.Through the combination of micro-crystalline phase generating system and finite element（FE） solver,ABAQUS,FE simulation for dual-phase steel based on micro-crystalline phase modeling can be achieved.In the simulation,the ferrite and martensite of single phase are both simulated by the ideal elastic-plastic model,and the material damage behavior is simulated using ductile damage model.On this basis,a series of micro-crystalline phase simulation models of different grain sizes and different martensite volume fractions for dual-phase steel are established,and the energy absorption characteristic of dual-phase steel is studied.It is found that though the energy absorption for dual-phase steel varies with the grain sizes slightly,the overall trend for all is increased first and then decreased with increasing the martensite volume fraction.The martensite volume fractions for dual-phase steel of optimal energy absorption are all within the range of 2%to 5%.The energy absorption research of dual-phase steel under micro-scale is realized,and guidance for selection of lightweight body safety components is provided.

关 键 词：双相钢 晶相建模 吸能特性 车身安全件 

分 类 号：U465[一般工业技术—材料科学与工程]