混凝土SHPB试验的数值模拟及应力均匀性

Simulation of SHPB Test on Concrete and Uniformity of Stresses

用显式动力有限元软件LS-DYNA,模拟C100与C80高强混凝土SHPB试验过程.混凝土采用H-J-C本构模型.得到了与试验结果比较吻合的应力-应变关系曲线.根据模拟结果分析了SHPB试验中C100混凝土试件的应力均匀性.结果表明,混凝土试件在破坏前一段时间内,应力有一定的不均匀性,因此会造成试验结果的误差.

Split Hopkinson pressure bar （SHPB） tests on C100 and C80 concrete specimens were simulated with explicit dynamic finite element software LS-DYNA. The concrete specimens were simulated with the Johnson-Holmquist-concrete constitutive model. The stress-strain curves obtained by simulation are in good agreement with the experimental results reported in literature. Stress uniformity in the C100 specimen was analyzed. Result shows that the stresses in the specimen are not uniform in a short period before failure, which brings error to test result.