S-wave tracing technique to investigate the damage and failure behavior of brittle materials subjected to shock loading
S-wave tracing technique to investigate the damage and failure behavior of brittle materials subjected to shock loading
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DOI：
10.1016/j.ijimpeng.2004.07.005
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发表时间：
2005-10
影响因子：
5.1
通讯作者：
Zhiping Tang;Songlin Xu;X. Dai;Xiaojun Hu;X. Liao;Jian Cai
中科院分区：
文献类型：
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作者：
Zhiping Tang;Songlin Xu;X. Dai;Xiaojun Hu;X. Liao;Jian Cai
为了揭示脆性材料在冲击载荷作用下动态损伤和破坏行为的内在规律，本文基于波传播理论和压剪复合冲击技术，提出并详细讨论了横向剪切波追踪技术（SWT）。SWT方法的思想是通过测量加载和卸载剪切波的传播特征来真实的实时诊断材料状态。利用SWT技术，对纤维增强水泥（FCEM）在不同位置埋设电磁粒子速度计的初步实验结果进行了报道和分析。通过对剪切波传播过程的追踪，发现卸载剪切波的振幅和速度（S-）与材料的损伤程度有关。当冲击速度超过197 m/s时，S−消失，表明FCEM存在一个从损伤状态向失效状态的转变点。这是因为在FCEM的Hugoniot上没有明显的尖点来指示这种转变。对SWT方法的理解和发展还需要进一步的研究。
To reveal the intrinsic rules of dynamic damage and failure behavior for brittle materials subjected to shock loading, a so-called transversal shear wave tracing technique (SWT) is proposed and discussed in detail in the present paper based on the wave propagation theory and the combined compression–shear impact technique. The idea of the SWT method is to diagnose the material state at real time by measuring the propagation features of loading and unloading shear waves. By using SWT technique, the preliminary experimental results of fiber-reinforced cement (FCEM) with electromagnetic particle velocity gauges embedded in the sample at different locations are reported and analyzed. By tracing the shear wave propagation, it is found that the amplitude and speed of unloading shear wave (S−) are related to the damage degree of the material. Particularly, S−vanishes when impact velocities exceed 197m/s, which discloses clearly a transition point from damage state to failure state of FCEM. It is significant for there is no obvious cusp to indicate such transition on the Hugoniot of FCEM. Some further studies are needed for understanding and developing of SWT method.