基于CT试样的动态断裂韧性尺寸影响因素试验研究  

EXPERIMENTAL STUDY ON INFLUENCE FACTORS OF DYNAMIC FRACTURE TOUGHNESS SIZE BASED ON CT SAMPLE

作　　者：邹广平[1] 吴松阳 闫安石 李寅辰 张志俊 唱忠良[1] ZOU GuangPing;WU SongYang;YAN AnShi;LI YinChen;ZHANG ZhiJun;CHANG ZhongLiang(College of Aerospace and Civil Engineering,Harbin Engineering University,Harbin 150001,China)

机构地区：[1]哈尔滨工程大学航天与建筑工程学院,哈尔滨150001

出　　处：《机械强度》2023年第6期1326-1331,共6页Journal of Mechanical Strength

基　　金：国家自然科学基金项目(11972127)资助。

摘　　要：为研究紧凑拉伸(Compact Tensile,CT)试样尺寸对动态断裂韧性试验的影响,使用分离式霍普金森拉杆(Split Hopkinson Tie Bar,SHTB)装置对2A12T4铝合金CT试样进行了动态断裂测试,通过数字散斑相关法(Digital Speckle Correlation Method,DSCM)计算了试样的动态断裂韧性,并对比应变片法计算结果说明了此种方法的正确性。研究试件的不同大小和加载孔位置对动态断裂韧性的影响,研究结果表明,W/B的值越小,CT试样动态断裂韧性值越小且降低的趋势逐渐变缓,对于W/B值相同的不同尺寸试样,其动态断裂韧性差距很小,改变加载圆孔圆心距对动态断裂韧性试验结果影响较小。In order to study the influence of compact tensile(CT)specimen size on dynamic fracture toughness test,a dynamic fracture test of 2112T4 aluminium alloy CT was carried out based on a split Hopkinson tie bar(SHTB)device.The dynamic fracture toughness of the specimen was calculated by digital speckle correlation method(DSCM),and the correctness of this method was demonstrated by comparing the results of strain gauge method.The influence of different sizes of specimens and loading hole locations on dynamic fracture toughness was studied.The results show that the smaller the value of W/B,the smaller the dynamic fracture toughness value of CT specimens and the slower the decreasing trend.For samples of different sizes with the same W/B value,the dynamic fracture toughness gap is small.Changing the center distance of loading round hole has little influence on the experimental results of dynamic fracture toughness.

关 键 词：紧凑拉伸试样 数字散斑相关法 动态加载 断裂韧性 霍普金森拉杆 

分 类 号：O346.4[理学—固体力学]