Study On Simulation And Experiment Of Micro Cutting Of Fiber Reinforced Plastics Composites

Fibers reinforced plastics composites have exceptional mechanical and thermal properties, which are widely used in aviation, aerospace, national defense, automotive and other high-tech fields. Currently, carbon fiber reinforced plastics composites(CFRP), which were imported or embargoed from abroad, are used in electronic devices in the field of aviation, aerospace and defense overseas. Understanding and controlling of the properties of CFRP would make such high performance materials more economical and effective in various engineering applications. However, most of the present work is focused on the preparation and characterization of composites from materials science. The deformation and failure of the material in the high strain rate are seldom studied. Therefore, the research on the machining characteristics of CFRP will promote the application of this kind of high performance material in engineering practice.In this paper, based on the finite element software ABAQUS secondary development, the representative volume element is used to establish CFRP micro geometric model. The model uses transposition algorithm to obtain random distribution and high volume fraction of fibers. The material model of CFRP is built in the finite element simulation: the brittle material model is used to simulate carbon fiber material; interpolation method is used to approximate the stress-strain relationship of the resin matrix; traction separation cohesive model is used to simulate the interfacial phase between fiber and matrix.Based on the geometric model and material model, the three dimensional finite element simulation model of micro cutting of CFRP is built to study micro cutting of CFRP under different machining parameters to obtain the rules of cutting force. The deformation mechanism of fiber and matrix are studied by analyzing the surface morphology. The influence of different fiber orientation on the processing performance of the composite was studied, the surface morphology and the stress transfer law of the cutting region were obtained.Micro cutting experiments of CFRP are developed using diamond coating hard alloy milling cutter to obtain the change rule of cutting force under different cutting parameters, which verify the results of finite element simulation. The surface quality of the composite material is studied, the surface roughness is measured and the morphology of the composite is observed to obtain the influence of different cutting parameters and fiber orientation on the quality of the machined surface.