Presidential Young Investigator Award: Quasi-Static and Dynamic Fracture of Ductile Solids

这项研究调查了延性固体，主要是结构钢的准静态和动态断裂所涉及的物理过程。具体地说，将通过实验和分析模型来研究惯性、塑性和速率敏感性的影响。塑性和动态载荷的强烈效应及其相互作用，使得这些问题在建立必要的设计程序以避免因断裂而失效时尤为重要。将建立高延性固体中裂纹萌生和扩展的分析模型，并将这些模型的预测与实验观测进行比较。这项研究还包括开发光学技术，以提供关于近裂纹尖端应变场和位移场的结构的直接信息。

This research investigates the physical processes involved in the quasistatic and dynamic fracture of ductile solids, primarily structural steels. Specifically, the effects of inertia, plasticity, and rate sensitivity will be studied through experiments and analytical modeling. The strong effect of plasticity and dynamic loading, and their interaction, makes such problems particularly important in the establishment of the necessary design procedures to be used to avoid failure by fracture. Analytical models will be developed for crack initiation and growth in highly ductile solids, and predictions of these models will be compared with experimental observations. The research also involves the development of optical techniques to provide direct information about the structure of the near-crack tip strain and displacement fields.