NSF/Sandia: Effect of Loading History on Ductile Fracture

加载历史对韧性断裂的影响由美国国家科学基金会/桑迪亚联盟资助的项目摘要：目前的项目关注的是制造过程对给定结构部件在使用和/或意外载荷下下游性能的影响。虽然这个问题在航空航天、国防和汽车工业中有直接的应用，但在公开文献中没有相关的工作报道。新项目的目标是对复杂加载路径下的韧性断裂力学有一个基本的了解，并建立一个更通用的断裂模型，适用于单调加载和反向加载。麻省理工学院进行的一项初步研究表明，材料的拉伸延展性受到预压缩量的显著影响。该项目将现有的断裂理论扩展到复杂加载历史的情况，从而提高基于仿真设计的可靠性和准确性。

Effect of loading history on ductile fractureBy Tomasz Wierzbicki and Lallit AnandProject to be funded by the NSF/Sandia allianceABSTRACT The present project is concerned with the effect of the manufacturing process on the downstream performance of a given structural component subjected to service and/or accidental loads. Although this problem has direct applications in aerospace, defense, and automotive industry, no relevant work has been reported in the open literature. The objective of the new project is to get a fundamental understanding of the mechanics of ductile fracture under complex loading paths and to develop a more general fracture model applicable to both monotonic and reverse loading. A pilot study conducted at MIT has shown that the material ductility in tension is dramatically affected by the amount of pre-compression. The project will extend the existing fracture theories to the case of complex loading histories and thereby will lead to the improvement of the reliability and accuracy of simulation-based design.