摘要
针对高锁螺栓单搭接件所采用的2024-O-T42铝合金,设计狗骨试验件进行准静态与动态拉伸试验,设计六种不同的缺口试验件进行准静态拉伸试验。通过开展拉伸失效仿真,对比Hartley-Srinivasan与Johnson-Cook两种本构模型,以及最大塑性应变失效准则、Johnson-Cook失效模型与GISSMO损伤模型三种失效模型。结果表明,在试验的100 s^(-1)应变率范围内,2024-O-T42铝合金材料流动应力应变率效应不明显,其最大相差约为5%;在不考虑应变率及温度的情况下,Hartley-Srinivasan本构模型比Johnson-Cook本构模型更能准确表征材料塑性段的力学行为;采用Hartley-Srinivasan本构模型和GISSMO损伤模型,高锁螺栓单搭接件在1 m/s、3 m/s、5 m/s拉伸速度下的仿真结果与试验结果吻合更好,且仿真获得的失效位移相对试验失效位移平均值分别偏大4.7%、偏大4.3%和偏小7.4%。
For the 2024-O-T42 aluminum alloy used in the single lap joint of the high locking bolt,the dog bone test pieces were designed for quasi-static and dynamic tensile testing,and six different notched test pieces were designed for quasi-static tensile testing.By conducting tensile failure simulations,two constitutive models(Hartley-Srinivasan and Johnson-Cook)and three failure models(maximum plastic strain failure criterion,Johnson-Cook failure model and GISSMO damage model)were compared.The results show that the flow stress-strain rate effect of 2024-O-T42 aluminum alloy material is not obvious in the tested strain rate range of 100 s-1,and the maximum difference is about 5%;the Hartley-Srinivasan constitutive mode is more accurate than the Johnson-Cook constitutive mode in characterizing the mechanical behavior of the plastic section of the material without considering the strain rate and temperature.By using the Hartley-Srinivasan constitutive mode and GISSMO damage model,the simulation results of the single lap joint at 1 m/s,3 m/s,and 5 m/s tensile velocities are in better agreement with the experimental results.Compared with the mean value of test failure displacement,the simulated failure displacements are 4.7%larger,4.3%larger,and 7.4%smaller,respectively.
作者
牟浩蕾
陈英实
魏家威
李恒晖
解江
冯振宇
MOU Haolei;CHEN Yingshi;WEI Jiawei;LI Henghui;XIE Jiang;FENG Zhenyu(College of Safety Science and Engineering,Civil Aviation University of China,Tianjin 300300,China;Science and Technology Innovation Research Institute,Civil Aviation University of China,Tianjin 300300,China)
出处
《材料导报》
CSCD
北大核心
2023年第S01期426-432,共7页
Materials Reports
基金
天津市多元投入基金项目(21JCYBJC00690)
中国民航大学研究生科研创新项目资助。
