Crystal Plasticity on the Nano and Micro Scales: Micromechanical Theory and Experiments

摘要：纳米和微米尺度上的晶体塑性。 微机械理论与实验。DJ. Mesarovic，华盛顿州立大学机械与材料工程学院提出了小体积位错塑性的基础研究。 拟议的研究将协调实验，离散位错（DD）模拟，和，开发和实施的实验和DD模拟指导下的微机械连续理论。 理论与实验之间以及连续介质理论与其微观力学基础（位错力学）之间现有的差距将被弥合。提出了具有少量活动滑动系统的简单二维几何形状的实验。 除了最近进行的楔形微压痕，约束剪切的薄膜将进行随后的OIM测量晶格旋转，晶格曲率和密度的几何必要dislocations.By开发一个严格的热力学基础的连续理论的位错力学。 这将使明确的连续解释的实验结果和离散位错simulation.The设想的研究计划是在MME/WSU的研究生和本科教育相结合。

ABSTRACT: Crystal Plasticity on the Nano and Micro Scales. Micromechanical Theory and Experiments.PI: S. Dj. Mesarovic, School of Mechanical and Materials Engineering, Washington State UniversityA fundamental study of dislocation plasticity in small volumes is proposed. The proposed study will coordinate experiments, discrete dislocation (DD) simulations, and, development and implementation of a micromechanical continuum theory guided by experiments and DD simulations. The existing gaps - between theories and experiments, and, between a continuum theory and its micromechanical foundation (dislocation mechanics), will be closed.The experiments on simple two-dimensional geometries with small number of active slip systems are proposed. In addition to the recently performed wedge microindentation, the constrained shear of a thin film will be performed with subsequent OIM measurements of lattice rotations, lattice curvature and densities of geometrically necessary dislocations.By developing a rigorous thermodynamic foundation of the continuum theory based on dislocation mechanics. This will enable unambiguous continuum interpretation of experimental results and of discrete dislocation simulations.The envisioned research program is integrated with graduate and undergraduate education at MME/WSU.