冲击加载下纤维增强水泥的动态损伤和失效特性研究

为了研究纤维增强水泥(FCEM)在冲击加载下的损伤演化特性，我们发展了一种基于压剪联合加载的横向剪切波跟踪技术(SWT)。该技术可以实时跟踪测量试样内部损伤失效行为．初步实验结果表明，FCEM的P—V Hugoniot线具有4个特征点A、B、C、D，分别对应材料的HEL点，剪切强度极限点(损伤至失效转变点)，孔洞崩塌点和密实介质再压缩点，其中孔洞崩塌约产生10％的体积压缩．本文采用三维离散元方法(DM3)对脆性材料中的孔洞崩塌进行了数值模拟，得到较满意的结果．

Investigation on Dynamic Damage and Failure Property of Fiber Reinforced Cement Subject to Shock Loading

To investigate the damage evolution of fiber reinforced cement (FCEM) subjected to shock loading, a so-called transversal shear wave tracing technique (SWT) is developed in this lab based on a combined compression and shear impact loading experimental technique. The preliminary experimental results of FCEM are obtained with the technique. There exist four critical points, A , B, C and D in P-V Hugoniot curves that correspond to the HEL of the material, the critical point for shear strength limit and transition from damage state to failure state, void collapse, and solid compression, respectively. Among them, the process of void collapse is the most important. A three-dimensional discrete meso-element method (DM3) is then employed in the present paper to simulate the process of void collapse. The preliminary result is satisfactory.