国产结构用铝合金断裂韧性参数校准  

Toughness Parameters Calibration of Chinese Structural Aluminum Alloys

作　　者：张超众 郭小农[1] 宗绍晗 陈宇[1] 朱劭骏 ZHANG Chaozhong;GUO Xiaonong;ZONG Shaohan;CHEN Yu;ZHU Shaojun(College of Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学土木工程学院,上海200092

出　　处：《湖南大学学报（自然科学版）》2020年第5期124-133,共10页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(51478335)。

摘　　要：为了将空穴增长模型(VGM)和应力修正临界应变模型(SMCS)应用于国产结构用铝合金的韧性断裂预测,完成了国产6061-T6、6082-T6和7020-T63种牌号的铝合金标准圆棒试件和缺口圆棒试件的单轴拉伸试验,并结合有限元分析,校准了3种牌号铝合金的VGM和SMCS模型断裂韧性参数.研究结果表明:槽口半径大小对各牌号铝合金试件的断裂韧性参数校准值影响较小,离散系数均在20%以内;断裂韧性参数是铝合金材料固有属性,可用于国产结构用铝合金在不同应力状态下的韧性断裂预测;与SMCS模型相比,VGM模型能够更为精确地预测铝合金材料的韧性断裂.In order to apply the Void Growth Model(VGM)and Stress Modified Critical Strain model(SMCS)to predict the ductile fracture of Chinese structural aluminum alloys,uniaxial tensile tests on aluminum alloy 6061-T6,6082-T6 and 7020-T6 were carried out,including smooth round bar specimens and notched round bar specimens.Besides,finite element analyses were conducted to calibrate the toughness parameters of three brands of aluminum alloys.The results show that the radius of the notch has slight influence on the toughness parameters of aluminum alloys,and the dispersion coefficients are all within 20%.It is indicated that the toughness parameter is an inherent attribute of the aluminum alloy material,and it can be used to predict the ductile fracture of Chinese structural aluminum alloys under various stress states.Compared with the SMCS model,the VGM model can predict the ductile fracture of aluminum alloys more accurately.

关 键 词：铝合金 韧性断裂 VGM模型 SMCS模型 韧性参数校准 

分 类 号：TU395[建筑科学—结构工程]