材料的动态力学性能与其微观组织结构密切相关，而原位力学测试技术是研究二者之间关联规律的有力工具。目前，国际上尚无一种能够同时进行动态力学性能测试与微观组织形貌观测的实验装置，制约了冲击动力学学科的发展。本项目拟以分离式Hopkinson杆为基础，设计一套具有原位观察能力的测试装置，建立动态力学测试与高速显微观测相结合的实验方法；并选取绝热剪切局部化(ASL)这一典型的动态变形失稳过程作为研究对象，利用所设计的动态原位力学测试装置研究微观组织结构(尤其是晶粒尺度)在ASL产生和发展过程中所起作用及演化规律。本项目的研究成果将为材料动态力学行为的研究提供一种新的技术手段，对于深刻理解冲击载荷下材料微观组织结构与宏观力学行为之间的关联规律这一科学命题起到支撑作用；同时利用该实验装置对ASL与材料微观组织演化规律的研究将有助于明确ASL的产生条件和判据，澄清当前存在的争议，具有重要的科学意义。

Dynamic mechanical behaviors of materials are closely related to their microstructures and in-situ mechanical testing technique is a powerful tool to uncover their relationship. However, there is no such apparatus that could simultaneously record both the dynamic mechanical properties and microstructural morphology evolution, which limits the development of impact dynamics. Based on split Hopkinson bar, this project aims to design a testing apparatus with in-situ observation unit and to accomplish an experimental method of dynamic mechanical testing combined with high-speed microscopic observation. Adiabatic shear localization (ASL), a typical phenomenon of dynamic deformation instability, will be studied by the designed equipment. The effects of microstructure, especially grain size, on the initiation and propagation of ASL will be examined. This project will provide a new technique for investigating dynamic mechanical behavior of materials, which is supportive for understand comprehensively the relevancy between microstructure and macro-mechanical performance. Meanwhile, the results on relationship between ASL and microstructure evolution will be helpful in uncovering the condition and criterion of ASL initiation and clarifying the current debate, which has important scientific significance.