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动态损伤演化的空间不连续性实验研究
Experimental study of the spatial discontinuity of dynamic damage evolution
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摘要: 对冲击加载下高纯铝的损伤演化进行了实验研究。利用基于白光轴向色差的表面轮廓测试技术测试冲击加载“软回收”的样品截面，对测试结果进行三维重构和损伤量化计算。结果表明：受到孔洞形核效应、尺寸效应和应力松弛作用，在损伤演化早期，损伤度随着空间的分布是不连续的，除最大损伤度以外还存在一个次高峰。在损伤演化后期，受到贯穿作用的影响，损伤度增量随空间的分布也是不连续的，贯穿区域损伤度迅速增加，损伤度曲线的次高峰特征消失。Abstract: In this paper, the damage evolution of high purity aluminum under shock loading is investigated experimentally. The surface profile measurement technique based on white light axial chromatic aberration is used to measure the cross-section of sample which is soft-recovered from dynamic impact experiments. Then, the cross-section image and 3-D surface topography are obtained by reconstruction of the data, the quantified damage is also calculated based on the data. The results show that in the early stage of damage evolution the spatial distribution of relative void volume is not continuous, which results from nucleation affect, size affect and stress relaxation. The damage curves show not only the maximum damage but also a second peak. In the late stage of damage evolution, the spatial distribution of damage increment is discontinuous, which results from the coalescence of voids. The damage of the coalescence region rapidly increases and the secondary peak of the damage curve disappears.
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