基于分离式SHPB装置对基体材料、不同纤维掺量的ECC在R1(5.8~6.9 s-1)、R2(9.7~13.3 s-1)、R3(14.4~18.9 s-1)、R4(19.2~28.5 s-1)四个应变率范围下进行冲击劈裂拉伸试验。探究基体材料、ECC在不同应变率下的动态力学特性及纤维掺量对ECC力学性能的影响。试验表明基体材料、ECC的动态劈裂拉伸强度均具有显著的应变率增强效应；纤维掺量小于2.3%时，纤维掺量与动态劈裂抗拉强度呈现出正相关。此外，通过试验发现基体材料的吸能能力与试件的破碎形态有关，随着纤维掺量的增加ECC破碎程度减小，微裂缝增多。通过拟合试验数据修正了ECC的应变率效应，并将修正后的模型嵌入到LS-DYNA中，基于新建模型对试验的全过程进行数值模拟分析，相较于试验数据，模拟结果最大误差为8%。最小误差为2.3%，试件的破坏形态吻合程度较高，数值模拟结果表明新建ECC材料模型能够较好表现ECC动态拉伸特性。
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.
关键词
ECC /
冲击劈裂拉伸 /
耗能 /
SHPB /
破坏形态
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Key words
ECC /
Impact split stretch /
energy consumption /
destructive form
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