Abstract

The accumulation of defects during uniaxial compression of a natural heterogeneous material has been studied experimentally. The defect formation process has been controlled using two methods of nondestructive testing: acoustic emission (AE) and X-ray computer tomography (CT). Simultaneous use of these methods makes it possible to establish the correspondence between the energy characteristics of AE that accompanies the defect formation and the volume of these defects. It is found that the dependence of the defect volume on the summary energy of the AE signals is linear, which corresponds to the phenomenological dependences obtained for the tectonic earthquake focuses before. The linear dependence is used to estimate the average defect size. It is shown that the average linear defect size is not larger than 100 μm independent of the assumptions on the defect shape.

中文翻译：

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非均质材料变形过程中累积损伤的结构能定律

摘要

实验研究了天然异质材料在单轴压缩过程中缺陷的积累。使用两种非破坏性测试方法控制了缺陷形成过程：声发射（AE）和X射线计算机断层扫描（CT）。同时使用这些方法可以在伴随缺陷形成的AE的能量特征与这些缺陷的体积之间建立对应关系。发现缺陷量对声发射信号总能量的依赖性是线性的，这与构造地震震源以前获得的现象学依赖性相对应。线性相关性用于估计平均缺陷尺寸。