An Experimental and Analytical Investigation into the Statistics of Creep Rupture

本研究对蠕变断裂试验的失效时间数据的离散性进行了实验和分析研究。现有的蠕变断裂实验数据显示出相当大的分散性和变异性。到目前为止，力学研究还没有量化这种散射体的性质，也没有在结构设计中考虑到它。这项研究由两个平行阶段组成。第一阶段是对生物晶体和其他简单结构中断裂统计的实验研究。第二阶段是构建基于微结构的分析模型，这将允许对故障发生时间进行概率预测。这一研究结果将对简单晶体结构蠕变断裂过程的可能性提供新的和基本的见解，并将有助于为理解复杂多晶结构蠕变断裂的实际性质奠定基础。

This research performs experimental and analytical investigations into the statistics of the scatter in time-to-failure data from creep rupture tests. Available experimental data in creep rupture show considerable scatters and variations. Mechanics research, thus far, has not quantified the nature of such scatters or accounted for it in the design of structures. The research consists of two parallel phases. The first phase is an experimental investigation into the statistics of rupture in biocrystals and other simple structures. The second phase is the construction of microstructurally-based analytical models which will allow probablistic predictions of time-to-failure. The results of this research will provide new and fundamental insight into the probablistic aspects of the creep rupture process in simple crystalline structures and will help to lay the foundations to understand the actual nature of the creep rupture of complicated poly-crystalline structures.