Quantifying variability in the mechanical response of CrCrZr alloys using crystal plasticity modelling

该项目旨在评估预计在原型聚变工厂中使用的金属接头的蠕变疲劳寿命。所研究的接头由CuCrZr自焊缝组成。为了更好地预测焊缝的寿命，需要一种准确预测焊缝应力分布的方法。根据规定，使用该小组开发的晶体塑性建模框架将提供所需的应力场，因为它考虑了焊缝上的微观结构变化。项目的第一步是对CuCrZr高温低循环测试模型进行校准。在项目后期，考虑到CuCrZr变形对热处理非常敏感，机械性能的变化将通过使用晶体塑性框架的基于微观结构的灵敏度分析来估计。

This project aims to evaluate the creep-fatigue life of metal joints that are expected to feature in prototype fusion plants. The joints of interest are made up of autogenous CuCrZr welds. A method to accurately predict the stress distribution across the weld is needed for better prediction of its life. It is stipulated that the use of a crystal plasticity modelling framework that has been developed in the group will provide the needed stress field as it accounts for the microstructure variability across the weld.The first step in the project is the calibration of the model to CuCrZr high-temperature, low-cyclic testing. Later during the project, considering CuCrZr deformation is very sensitive to heat-treatment, the variability in the mechanical performance will be estimated by a microstructure-based sensitivity analysis using the crystal plasticity framework.