基于热力耦合仿真的CFRP直角切削机理研究

Research on Orthogonal Cutting Mechanism of CFRP Based on Thermo-mechanical Couple Simulation

直角切削是航空航天领域纤维增强复合材料CFRP加工性能分析的重要手段。通过有限元仿真的方式,考虑切削热的影响,以直角切削的表现形式模拟CFRP材料的加工过程,分别对纤维方向角为0°,45°,90°,135°的直角切削模型进行动态仿真分析。采用Hashin损伤准则及其损伤演化准则定义材料的失效,在模拟热力耦合切削过程时将工件单元类型选为温度—位移耦合型,输出仿真结果,使用ABAQUS软件的后处理模块处理得到不同纤维方向角的加工模型的温度云图与应力云图,对其所表现出的各向异性进行了探讨。对建立起的CFRP切削仿真结果进行分析,将切削热作为比对标准,分析切削力—切削热的关联性。

The orthogonal cutting is an important means of processing performance analysis of Carbon Fiber Reinforced Plastics(CFRP) in the aerospace industry.In this paper,considering the influence of cutting heat,the machining process of CFRP is simulated by the expression of the orthogonal cutting based on finite element simulation method.The dynamic simulation analysis of orthogonal cutting models with fiber orientation angles of 0°,45°,90° and 135° are respectively carried out.In the simulation analysis,the Hashin damage criterion and its damage evolution criterion are used to define the failure of the material.The mesh of workpiece is selected as the temperature-displacement coupling type during the simulation of the thermo-mechanical coupling cutting process.The nephogram of temperature and stress of the processing simulation models with different fiber orientation angles are obtained by using the post-processing module of ABAQUS software,and the anisotropy of results is discussed.The results of the established CFRP cutting model are analyzed,and the correlation of cutting force and cutting heat is discussed by using the cutting heat as the comparison standard.