论文部分内容阅读
为了研究纤维增强复合材料在切削过程中的材料去除机理及切削性能,本文建立了基于三相微观结构的纤维增强复合材料的二维有限元切削模型。针对纤维、基体和界面相组成三相微观结构,分别建立了它们的本构模型和失效准则,并完成复合材料二维正交切削的动态物理仿真。通过切削力仿真值与实验值的比较,验证了该模型的准确性和有效性。并基于此模型,分析材料的切屑形成机理、切削损伤及加工参数对切削力的影响。结果表明,纤维增强复合材料的切屑形态、损伤模式和切削力具有明显的各向异性。
In order to study the material removal mechanism and cutting performance of fiber reinforced composites during cutting, a two-dimensional finite element model of the fiber-reinforced composite material based on three-phase microstructure was established. According to the three-phase microstructure composed of fiber, matrix and interface phase, their constitutive models and failure criteria were established, and the dynamic physical simulation of two-dimensional orthogonal cutting of composites was completed. The simulation results show that the model is accurate and effective. Based on this model, the mechanism of chip formation, cutting damage and processing parameters on the cutting force were analyzed. The results show that the chip shape, damage mode and cutting force of fiber reinforced composites have obvious anisotropy.