基于混凝土细观骨料模型的SHPB仿真模拟研究

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摘要将混凝土视为由粗骨料和砂浆基体组成的双相复合材料，建立了圆柱状三维混凝土细观骨料模型，并将其应用于SHPB仿真实验中。通过五种不同梯形载荷的加载计算，得到了试件不同应变率下的应力—应变曲线，并将模拟结果与实验结果进行对比分析。结果表明，使用细观骨料模型可以有效模拟混凝土SHPB实验并反映材料的动态力学性能，而且其宏观破坏形式也与传统的均匀材料模型有所不同，所建立的模型同时为多种非均匀材料的细观数值模拟提供了方便。最后通过几种不同骨料含量和骨料尺寸混凝土模型的计算研究了这两种因素对混凝土动态强度和应力均匀性的影响。

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	郭瑞奇1
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	任辉启2
	张磊2
	龙志林1
	吴祥云2
	李泽斌2

关键词 ： SHPB, 数值模拟, 细观骨料模型, 随机分布, 动态强度, 应力均匀性

Abstract：Concrete was considered as a two-phase composite material composed of coarse aggregates and cement matrix and a cylindrical three-dimensional concrete aggregate model was established and applied to split Hopkinson pressure bar(SHPB) simulation experiments. By means of applying five kinds of trapezoidal loads, the stress-strain curves of the concrete specimen at three different strain rate were obtained, afterwards a comparative analysis between the simulation results and experimental results was carried out. The results show that the model can be effectively applied in the SHPB simulation experiment of concrete and well reflect the dynamic mechanical behaviours. The corresponding macroscopic failure mode differs from the traditional homogeneous material model, which also provides references to the mesoscopic numerical simulation analysis of many other heterogeneous materials. The concrete aggregate models with different aggregate content and aggregate size were established, and the effects of aggregate volume fraction and dimension on the dynamic strength and stress uniformity of concrete specimen were studied.

Key words： split Hopkinson pressure bar （SHPB） numerical simulation mesoscopic aggregate model random distribution dynamic strength stress uniformity

收稿日期: 2019-01-31 出版日期: 2019-11-15

引用本文:

郭瑞奇1,2，任辉启2，张磊2，龙志林1，吴祥云2，李泽斌2. 基于混凝土细观骨料模型的SHPB仿真模拟研究[J]. 振动与冲击, 2019, 38(22): 107-116.
GUO Ruiqi1,2，REN Huiqi2，ZHANG Lei2，LONG Zhilin1，WU Xiangyun2，LI Zebin2. Simulation for SHPB tests based on a mesoscopic concrete aggregate model. JOURNAL OF VIBRATION AND SHOCK, 2019, 38(22): 107-116.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2019/V38/I22/107

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