纤维增强树脂基复合材料微切削仿真与实验研究

发布时间：2018-06-15 23:34

本文选题：纤维增强复合材料 + 微切削　；参考：《哈尔滨工业大学》2015年硕士论文

【摘要】：纤维增强树脂基复合材料具有超常的力学和热学等性能使其在航空、航天、国防以及汽车等高新技术领域得到了广泛的应用。目前,国外已将纤维增强树脂基复合材料应用在航空、航天、国防等领域的电子器件,而国内对于这类高端技术领域的产品,基本上处于依赖进口。对纤维增强树脂基复合材料加工特性的了解与掌控,有助于将这类性能优异的材料更加经济有效地应用于各类工程实际。然而,目前大部分工作集中于从材料学方面研究复合材料的制备和表征,较少研究高应变率条件下的变形和破坏。因此,研究纤维树脂基复合材料的切削加工特性,将有助于推广这类高性能材料的在工程实际中的应用。本文基于有限元软件ABAQUS二次开发,建立基于代表性体积单元的纤维增强复合材料微观几何模型,该模型采用错位法实现复合材料纤维的随机分布及高体积含量。建立碳纤维增强树脂基复合材料的材料模型,该模型采用脆性材料模型来模拟碳纤维材料,采用插值法逼近树脂基体的应力应变关系,采用牵引分离内聚力模型来模拟纤维和基体之间的界面相。基于纤维增强复合材料的几何模型和材料模型,建立微切削三维有限元仿真模型,对不同切削参数条件下复合材料的微切削过程进行研究,得到切削力随加工参数的变化规律;通过对加工表面形态进行分析,探索增强相和基体的变形机制;研究不同纤维取向对复合材料加工性能的影响,获得加工表面的形貌变化情况及切削区域应力传递规律。采用金刚石涂层硬质合金铣刀对碳纤维增强树脂基复合材料进行微切削实验,得到不同切削参数条件下的复合材料微切削过程切削力的变化规律,并对有限元仿真结果进行验证。对碳纤维增强树脂基复合材料加工表面质量进行研究,对加工前后表面形态进行观察,对加工表面粗糙度进行测量,得到不同切削参数和不同纤维取向对加工表面质量的影响规律。
[Abstract]:Fiber reinforced resin matrix composites have been widely used in the fields of aviation, aerospace, national defense and automobile due to their excellent mechanical and thermal properties. At present, fiber reinforced resin matrix composites have been used in aerospace, national defense and other fields of electronic devices, but the domestic products of such high-end technology are basically dependent on imports. Understanding and controlling the processing characteristics of fiber reinforced resin matrix composites is helpful to the application of this kind of excellent materials in engineering practice. However, most of the work has focused on the preparation and characterization of composite materials from the point of view of material science, and less on deformation and failure under high strain rate. Therefore, the study of cutting and machining characteristics of fiber resin matrix composites will be helpful to popularize the application of this kind of high performance materials in engineering practice. Based on the second development of finite element software Abaqus, the micro geometric model of fiber reinforced composites based on representative volume element is established in this paper. The dislocation method is used to realize the random distribution and high volume content of composite fiber. The material model of carbon fiber reinforced resin matrix composite was established. The brittle material model was used to simulate carbon fiber material, and the interpolation method was used to approximate the stress-strain relationship of resin matrix. The cohesive force model was used to simulate the interfacial phase between fiber and matrix. Based on the geometric model and material model of fiber reinforced composites, a three-dimensional finite element simulation model of micro-cutting is established. The micromachining process of composites under different cutting parameters is studied, and the variation of cutting force with machining parameters is obtained. By analyzing the morphology of the machined surface, the deformation mechanism of the reinforcing phase and matrix was explored, and the influence of different fiber orientation on the machining properties of the composites was studied. The morphologies of the machined surface and the stress transfer law in the cutting region were obtained. In this paper, diamond coated carbide milling cutter is used to conduct micro-cutting experiments on carbon fiber reinforced resin matrix composites, and the cutting forces of composites under different cutting parameters are obtained. The finite element simulation results are verified. The machined surface quality of carbon fiber reinforced resin matrix composites was studied. The surface morphology before and after processing was observed and the roughness of the machined surface was measured. The effects of different cutting parameters and fiber orientation on the surface quality were obtained.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB332

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