Q&P钢板滞弹性变形行为研究  

Anelastic behavior of Q&P steel

作　　者：温媛媛[1] 林建平[1,2] 庞政[1] 叶又[3] 康柳根[3] 

机构地区：[1]同济大学机械与能源工程学院,上海201804 [2]上海市地面交通工具空气动力与热环境模拟重点实验室,上海201804 [3]泛亚汽车技术中心有限公司,上海201201

出　　处：《塑性工程学报》2016年第6期131-136,共6页Journal of Plasticity Engineering

基　　金：高等学校博士学科点专项科研基金(20110072110056)

摘　　要：变形过程中滞弹性行为引起的弹性模量变化是影响高强钢回弹预测精度的一个重要因素,充分了解并掌握材料的滞弹性行为及弹性模量的变化规律对准确预测高强钢的回弹十分重要。以第三代超高强度钢QP980为研究对象,通过加载-卸载实验研究讨论了QP980滞弹性变形行为。实验结果表明,随真实应变增加,QP980钢板的弦模量不断降低,滞弹性应变的比例不断增加,弦模量和滞弹性应变呈线性关系,材料弦模量和滞弹性应变可以表示为真实应变的指数函数形式;使用抛物线函数对加载-卸载时的滞后环进行建模,进而可以预测在任一应变卸载时,应力应变之间的对应关系。Elastic modulus variation in the deformation process caused by anelastic behavior is one of the important factors that affects the accuracy of springback prediction, thus fully understanding and mastering the material anelastic behavior and elastic modulus variation are significant to accurately predict the springback of high strength steels. The third generation advanced high strength steel QP980 was taken as the case material, the anelastic behavior of QP980 was analyzed by the loading-unloading experiment. The experimental results show that, with strain increasing, the chord modulus of QP980 steel decreases, the percentage of anelastic strain increases, the chord modulus and anelastic strain have liner relationship, and both of them can be expressed as exponential function of true strain. The hysteresis loops were modeled by the parabolic function, so the relationship between strain and stress could be predicted at any unloading strain.

关 键 词：Q&P钢 加载-卸载实验 滞弹性行为 弦模量 滞后环 

分 类 号：TG142.12[一般工业技术—材料科学与工程]