Identification of critical damage value by notched round bar tensile test using image analysis

摘要：

In this study, circumferentially notched round bar tensile test using image analysis is proposed. Tensile load and outer shape of tensile test specimen at necking point of specimen are measured continuously through the test by using load cell and CCD camera, respectively. Necking deformation tracking method is devised in the image analysis procedure for measurement of two necking shape factors (radius of necking cross section and necking curvature radius). Various stress components such as flow stress, tensile true stress and so on at necking point are calculated by Bridgmans equations using the tensile load and the necking shape factors. From the result, flow stress curve of high carbon steel is obtained even after the occurrence of necking through the test. In addition, critical damage values of four integrated ductile fracture criteria are identified and it is showed that the critical values change depending on initial notch radius and stress triaxiality at necking.

关键词： tensile test image analysis ductile fracture flow stress critical damage value

作者: YOSHIDA Yoshinori

作者单位: Dept.of Mechanical and Systems Engineering,Gifu University,Yanagido 1-1,Gifu 501-1193,Japan

会议类型: 国际会议

会议名称: The 12th Asian Symposium on Precision Forging 第12届亚洲精密锻造学术研讨会 ASPF2012

会议地点: 苏州

会议语种:英文

页码: 1-4

在线出版日期: 2012-10-21（万方平台首次上网日期，不代表论文的发表时间）