NSF/Sandia: Effect of Loading History on Ductile Fracture

加载历史对延性断裂的影响Tomasz Wierzbicki和Lallit Anand由NSF/Sandia联盟资助的项目本项目关注制造工艺对承受服役和/或意外载荷的给定结构部件下游性能的影响。虽然这一问题在航空航天、国防和汽车工业中有直接的应用，但在公开文献中还没有相关的工作报道。新项目的目标是对复杂加载路径下韧性断裂的力学有一个基本的了解，并开发一个更通用的断裂模型，既适用于单调加载，也适用于反向加载。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预压缩量的影响很大。该项目将现有的断裂理论扩展到复杂加载历史的情况，从而将提高基于模拟的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.