摘要
采用LS-DYNA开展了分离式霍普金森扭杆实验的数值模拟分析。通过数值模拟获得波导杆上的应变信号,将波导杆上的信号按照扭转SHB实验的数据处理方法获得试件材料的"实验"应力应变曲线,再通过与输入的本构关系进行比较,观测"真值"与数值实验结果的差别。通过数值模拟结果讨论了实验加载过程中的试件变形和应力均匀性,并进一步分析了试件的测试段壁厚和直径对实验结果的影响。
Numerical simulation on torsional split Hopkinson bar （SHB） tests was carried out with LS-DYNA. The strain signals on the incident bar and output bar were obtained from the simulation just as from the test. Then the numerical experiment result of the material strain-stress relationship was reduced from the numerical strain signal with the experiments data process of torsinal SHB. The validity and accuracy of the torsional SHB were analyzed through the comparison of the numerical experiment result and the input constitutive relationship. The uniformity of the specimen deformation and stress in the loading process, as well as the influence of specimen test section wall thickness and diameter to the experimental result, was discussed with the numerical simulation.
出处
《四川理工学院学报（自然科学版）》
CAS
2017年第1期43-48,共6页
Journal of Sichuan University of Science & Engineering(Natural Science Edition)
基金
国家自然科学基金项目(11572299)
关键词
扭转SHB
LS—DYNA
数值实验
torsional split Hopkinson bar
LS-DYNA
numerical experiment
