Mechanisms of Microstructural Influences on Cyclic Plasticity and Ratchetting

9634707穆斯布鲁格这个项目是研究循环材料变形情况下晶体织构变化的影响。对于单调加载，这些效应已经得到了广泛的研究，但对于循环变形，人们了解得很少。这种认识的缺乏影响了裂纹萌生模型以及裂纹扩展和失效的总体评估。晶粒度和织构在位错亚结构中起着重要作用，它们之间的交互作用决定了金属中的残余应力。在本项目中，将研究镍单晶的模拟和实验相结合的程序。在此数据库的基础上，将建立包含非均匀晶亚结构的显式多晶模型，研究循环塑性和棘轮型加载历史中晶粒度和织构对背应力的影响。***

9634707 Moosbrugger This project is to study the effect of a changing crystallographic texture in the case of cyclic material deformations. For monotonic loadings these effects have been studied extensively, but for cyclic deformations the understanding is poor. This lack of understanding affects crack initiation models as well as crack growth and failure evaluations in general. Grain size and texture play important roles in the dislocation substructures and their interactions determine the residual stresses in metals. In this project a combined modeling and experimental program will be studied in nickel single crystals. With this data base, explicit polycrystalline models including heterogeneous grain substructure will be built to study the influence of grain size and texture on back stress in cyclic plasticity and ratchetting type loading histories. ***