Experimental Investigation of Fracture in Opaque Materials

金属和陶瓷中的动态裂纹扩展将在 这个以实验为导向的研究项目一种新的多功能 利用微型应变计的实验技术将 被开发来评估断裂参数，J积分。 这 应变片技术与已建立的双折射 涂层和焦散线技术将用于分析快速裂纹 在不透明材料中传播。 这项研究将确定 材料和结构参数，这些参数决定了运行和制动 裂纹现象，用于设计安全失效时的止裂器 结构. Shukla博士还将继续他的经验模型， 裂纹弯曲和分支的光弹性。 他将发起 对4340钢在单轴和多轴载荷作用下的裂纹分支进行了新的研究。 双轴载荷 这样的研究应该会导致更好的理解 金属加工中材料去除过程的原理和设计 装甲和反装甲装置虽然年轻，Shukla博士 已经确立了自己作为一个有能力和细致的 动态断裂领域的实验家

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.