Abstract:Based on the separated SHPB device, ECC was tested in R1 (5.8~6.9s-1), R2 (9.7~13.3s-1), R3 (14.4~18.9s-1), R4 (19.2~28.5s-1) to explore the dynamic mechanical characteristics of matrix material and ECC at different strain rates and the influence of fiber incorporation on ECC.The test shows that the dynamic split tensile strength of ECC has significant strain rate enhancement effect;At less than 2.3%, the fiber incorporation showed a positive correlation with the dynamic split tensile strength.In addition, it was found that the energy absorption capacity of the matrix material is related to the crushing form of the specimen, and the degree of ECC fragmentation is increased with the increase of fiber incorporation.The strain rate effect of ECC was corrected by fitting the test data, and the modified model was embedded into LS-DYNA. The numerical simulation analysis of the whole process based on the new model, with a maximum error of 8% compared to the test data.The minimum error is 2.3%, and the failure morphology of the specimen is high. The above results show that the new ECC material model can perform the ECC dynamic stretching characteristics better.
李秀地,罗银剑,崔亚娇,傅鑫亮,蔡涛. ECC动态拉伸力学特性试验研究与数值模拟[J]. 振动与冲击, 2023, 42(9): 161-167.
LI Xiudi, LUO Yinjian, CUI Yajiao, FU Xinliang, CAI Tao. Test study and numerical simulation of dynamic tensile mechanical properties of ECC. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(9): 161-167.
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