单晶纯钛的细观力学性能模拟

Meso-Scale Simulation on Mechanical Behavior of Single Crystal Titanium

摘要:

采用晶体塑性理论和有限元方法，建立描述密排六方结构（hcp）金属力学行为的细观数值本构模型，利用该模型对单晶纯钛在高温下的单向拉伸试验进行模拟。模拟结果和实验现象相吻合，显示了该模型的有效性。计算结果同时揭示了单晶纯钛变形过程中各个滑移系所起的作用，并对滑移系的运动和晶格转动等细观演化规律进行了分析。

关键词:晶体塑性;细观本构模型;钛

Abstract:

A meso-scale numerical constitutive model was established by the theory of crystal plasticity and the finite element method to describe the mechanical behavior of the hexagonal close-packed (hcp) metal. Based on this model, the one-way tensile experiment on a single crystal of titanium at elevated temperature was simulated. The simulated results are consistent with the experimental ones, indicating that the model is reliable. The calculated results also reveal the action of each slip system in deformation process of single crystal titanium. The meso-scale deformation evolution, including grid slipping and crystal lattice reorientation, during the tensile deformation was also analyzed.

Key words:crystal plasticity; meso-scale constitutive model; titanium