爆炸应力波作用下分支裂纹动态力学特性试验

›› 2011, Vol. 32 ›› Issue (10): 3026-3032.

爆炸应力波作用下分支裂纹动态力学特性试验

李清^1，2，张茜¹，李晟源¹，谢建文¹，孟宁宁¹

1.中国矿业大学力学与建筑工程学院，北京 100083；2.中国矿业大学深部岩石力学与地下工程国家重点实验室，北京 100083

收稿日期:2010-02-10 出版日期:2011-10-10 发布日期:2011-10-13
作者简介:李清，男，1969年生，博士，教授，主要从事爆破工程及土木工程的教学和科研工作
基金资助:
国家自然科学基金项目资助（No. 50774086）；国家863计划目标导向项目资助（No. 2007AA06Z131）。

Experimental study of dynamic fracture behaviors of branched cracks under blasting stress wave

LI Qing^{1, 2}, ZHANG Xi¹, LI Sheng-yuan¹, XIE Jian-wen¹, MENG Ning-ning¹

1. School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing l00083, China; 2. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Beijing 100083, China

Received:2010-02-10 Online:2011-10-10 Published:2011-10-13

摘要/Abstract

摘要： 应用爆炸加载的透射式动焦散线测试系统，分析了平板中预制贯通裂纹在爆炸应力波作用下端部衍生分支裂纹及爆炸主裂纹的扩展规律。预制贯通裂纹面在压缩应力波及反射拉伸波作用下表现出明显的张开和闭合交替变化，预制贯通裂纹减弱了爆炸主裂纹的动态扩展行为，爆炸主裂纹难以穿过预制贯通裂纹继续扩展。分支裂纹是爆炸应力波在预制贯通裂纹端部衍射效应形成应力集中而衍生、起裂、扩展，其开裂角与预制贯通裂纹、爆炸应力波入射角密切相关，分支裂纹尖端沿着最大能量释放率方向起裂，逐渐平行于最大主应力的方向稳定扩展，中后期扩展多表现为复合型断裂。爆炸分支裂纹的动态应力强度因子、扩展速度低于爆炸主裂纹，获得了分支裂纹起裂韧度为0.50～0.65 MN/m3/2、止裂韧度为0.25～0.35 MN/m3/2。

关键词: 爆炸力学, 爆炸应力波, 预制贯通裂纹, 爆炸主裂纹, 分支裂纹, 动焦散线

Abstract: Dynamic caustics experimental technique is used to study dynamic characteristics of the propagation of explosion main cracks and branched cracks under blasting stress wave. The prefabricated cracks were opening or closing as a result of the explosion stress wave reflection from these cracks, and reduced the dynamic behaviors of explosion main cracks. These main cracks can’t generally pass through the prefabricated cracks and continue to extend. The branched cracks are derived from the ends of the prefabricated cracks. The initiation and propagation of branched cracks are caused by the diffraction effective of tensile stress concentration of the prefabricated crack tips. The split angles of branched cracks are closely related to the prefabricated cracks and angle of blasting incidence stress wave. The branched cracks initiation is started from the direction of generalized maximum energy release rate, and shown as mixed mode fracture and the stability propagation with the direction of maximum principal stress. The dynamic stress intensity factor and velocity of branched cracks are lower than blasting main cracks’. The initial fracture toughness of branched cracks is about 0.5-0.65 MN/m3/2. The arrest toughness of branched cracks is about 0.25-0.35 MN/m3/2

Key words: explosion mechanics, blasting stress wave, prefabricated through crack, explosion main crack, branched crack propagation, dynamic caustics

中图分类号:

O 384

李清，张茜，李晟源，谢建文，孟宁宁. 爆炸应力波作用下分支裂纹动态力学特性试验[J]. , 2011, 32(10): 3026-3032.

LI Qing , ZHANG Xi , LI Sheng-yuan , XIE Jian-wen , MENG Ning-ning. Experimental study of dynamic fracture behaviors of branched cracks under blasting stress wave[J]. , 2011, 32(10): 3026-3032.

参考文献

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