摘要
提出了一种基于数字图像相关(digital image correlation,DIC)技术和硬度试验的焊缝材料参数识别方法。首先根据金相试验和硬度试验将拼焊板分为焊缝区、热影响区和母材区,并采用DIC技术和硬度试验分别获取拼焊板各区域的主次应变值和硬度值。然后根据塑性力学理论推导出应变硬化指数n与主次应变值的计算公式以及强度系数K与硬度值的计算公式。通过推导出的理论计算公式,分别求出焊缝区和两个热影响区的材料参数。实例验证表明,该方法比传统方法具有更高的精度。
A refined method was proposed to identify the material parameters of a weld line based on the DIC technique and hardness test. According to the metallographic test and hardness test,the regions of the TWB were divided into the weld zones,heat affected zones,base metal zones according to hardness values. The values of the major and minor strain on which localized necking occured were obtained by DIC technique,and the hardness values of the weld zone were gained by the hardness test. Then,the relationship of the strain hardening exponent n and the major and minor strain were obtained according to plasticity theories. In addition,the relationship of strength coefficient K and hardness values were also derived. Thus, the material parameters of weld zone and two heat affected zones were obtained with the derived theoretical formula. Examples based on finite element simulation and experiments were used to verify the accuracy of this method, and the results show that the refined method is better than the traditional method,and the investigation has certain reference values for engineering analyses.
出处
《中国机械工程》
EI
CAS
CSCD
北大核心
2013年第2期274-279,共6页
China Mechanical Engineering
基金
国家自然科学基金资助项目(50905047)
汽车噪声振动和安全技术国家重点实验室2010年度开放基金资助项目(NVHSKL-201002)
江苏省道路载运工具新技术应用重点实验室开放基金资助项目(BM2008206007)
关键词
数字图像相关
硬度
焊缝
拼焊板
DIC(digital image correlation)
hardness
weld line
tailorwelded blank(TWB)
作者简介
付磊,男,1985年生。湖南大学汽车车身先进设计制造国家重点实验室硕士研究生。主要研究方向为汽车钢板力学性能和汽车车身覆盖件冲压成形CAE技术。
刘迪辉,男,1975年生。湖南大学汽车车身先进设计制造国家重点实验室副教授。
孙光永,男,1981年生。湖南大学汽车车身先进设计制造国家重点实验室讲师,汽车噪声振动和安全技术国家重点实验室访问学者。
李光耀。男,1963年生。湖南大学汽车车身先进设计制造国家重点实验室教授、博士研究生导师。
徐峰祥,男,1985年生。湖南大学汽车车身先进设计制造国家重点实验室博士研究生。
陈水生,男,1978年生。湖南大学汽车车身先进设计制造国家重点实验室博士后研究人员。