Experimental Investigation of Fracture in Opaque Materials

在这个以实验为导向的研究项目中，将研究金属和陶瓷中的动态裂纹扩展。将开发一种新的、通用的实验技术，它利用微型应变仪来评估断裂参数J积分。这种应变计技术将与已建立的双折射涂层和焦散技术一起用于分析不透明材料中的快速裂纹扩展。这项研究将确定控制裂纹运行和止裂现象的材料和结构参数，以便在安全失效结构中设计止裂器。舒克拉博士还将继续使用光弹性对裂纹弯曲和分支进行经验建模。他将启动一项新的4340钢在单轴和双轴载荷下的裂纹分支研究。这样的研究应该有助于更好地理解金属加工中的材料去除过程以及装甲和反装甲装置的设计。舒克拉博士虽然年轻，但他已经在动力骨折领域确立了自己作为一名称职和一丝不苟的实验者的地位。

Dynamic crack propagation in metals and ceramics will be studied in this experimentally oriented research program. A new and versatile experimental technique, which utilizes miniature strain gages, will be developed to evaluate a fracture parameter, the J-integral. This strain gage technique together with the established birefringent coating and caustics techniques will be used to analyze rapid crack propagation in opaque materials. This study will identify the material and structural parameters, which govern the run and arrest phenomena of a crack, for designing crack arresters in safe fail structures. Dr. Shukla will also continue his empirical modelling of crack curving and branching using photoelasticity. He will initiate a new crack branching study of 4340 steel subjected to uniaxial and biaxial loadings. Such study should lead to a better understanding of the material removal process in machining of metals and the design of armor and antiarmor devices. Although young, Dr. Shukla has already established himself as a competent and meticulous experimentalist in the field of dynamic fracture.