水泥砂浆SHPB实验惯性效应的数值模拟

发布时间：2018-01-09 22:25

本文关键词：水泥砂浆SHPB实验惯性效应的数值模拟　出处：《兵工学报》2014年S2期 　论文类型：期刊论文

【摘要】：水泥砂浆等混凝土类材料是一种应变率敏感材料,其力学性能与所受围压等因素有关,目前许多学者认为混凝土类材料的动态压缩强度增强是由于横向惯性效应的作用。水泥砂浆分离式霍普金森压杆(SHPB)实验过程中,端面围压或端面摩擦都会导致试样横向惯性作用的增强。为研究动态压缩强度增强与端面围压及轴向应变加速度的关系,本文利用ANSYS/LS-DYNA软件对直径37 mm SHPB测试直径37 mm、厚20 mm水泥砂浆试样的动态力学性能过程进行仿真。实验结果表明,在SHPB实验过程中,端面会产生起伏分布的动态静水压力,这可能是产生轴向压缩强度增强的主要原因;轴向单元的应变加速度产生的轴向附加应力,远小于试样轴向动态压缩强度增强。
[Abstract]:Cement mortar and concrete materials is a strain rate sensitive material, its mechanical properties and the related factors such as confining pressure, many scholars believe that the dynamic compressive strength of concrete material is due to transverse inertia effect of cement mortar. The split Hopkinson pressure bar (SHPB) in the course of the experiment, the confining pressure or end the friction will lead to enhanced lateral inertial effect. Samples to study the dynamic compressive strength with confining pressure and axial strain acceleration end, the diameter of 37 mm diameter 37 mm SHPB test using ANSYS/LS-DYNA software, simulation of dynamic mechanical properties of 20 mm thick cement mortar specimens. The experimental results show that in SHPB experiment in the process, the end will produce dynamic hydrostatic pressure distribution, which might be the main reason of the increase of axial compressive strength; axial strain acceleration production unit The axial additional stress of the raw material is much less than the axial dynamic compressive strength of the specimen.

【作者单位】：北京理工大学爆炸科学与技术国家重点实验室;
【分类号】：TQ177.62
【正文快照】： 0引言水泥砂浆,从成分上是由砂、水和水泥等主要成分组成的复合材料;从力学角度上是一种具有典型的跨尺度非均质、多组元、多相,带有先天微损伤的脆性混凝土类材料。由于混凝土类材料良好的力学性能(如抗压,耐腐蚀等),目前已广泛应用于军用和民用建筑领域。但由于其成分复杂,

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