Prediction method of damage depth under right-angle cutting surface with different speeds of cfrp

Abstract

A method for predicting the damage depth under the right angle cut surface of CFRP with different velocities belongs to the CFRP cutting proces field, and relates to a method for predicting the damagedepth under the right angle cutting surface of CFRP with different velocities. The three-dimensional meso-right-angle cutting model of CFRP is established by using finite element simulation technology and multi-phase modeling method, which includes fiber phase, resin phase, interface phase and equivalent homogeneous phase. The strain rate effect of resin and interfacial materials is considered inthe model, including the change of material properties under different strain rates. According to the actual situation, the simulation model is set up to predict the depth of in-plane damage of CFRPcutting at different speeds and right angles by setting the boundary conditions of tool feed and workpiece fixation. The simulation model of CFRP meso-orthogonal cutting considering the effect of resin and interfacial strain rate is established, and the simulation of CFRP orthogonal cutting at different velocities is realized. The in-plane damage of CFRP orthogonal cutting at different velocitiesis obtained, which can guide the damage suppression and the optimization of machining parameters.

Description

technical field [0001] The invention belongs to the field of cutting and processing of carbon fiber composite materials, and relates to a method for predicting damage depth under right-angle cutting surfaces of carbon fiber composite materials at different speeds. Background technique [0002] Carbon fiber reinforced composite materials (CFRP) have the characteristics of light weight, high strength, high temperature resistance and corrosion resistance, so they are widely used in aviation, aerospace, automobile manufacturing and other fields. However, because CFRP is composed of carbon fiber reinforced phase and resin matrix phase on the microscopic scale, and the material properties of each phase are very different, the fiber phase has extremely high strength and the resin is relatively weak. Therefore, during the CFRP cutting process, damages such as fiber pullout, pits or fiber resin peeling are very easy to occur under the machined surface, which seriously affects the str...

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Problems solved by technology

However, to carry out the above research through experimental methods requires a large number of experiments, and the time and material costs are high. At the same time, the research on the influence of cutting speed on subsurface damage and its causes requires the observation of CFRP at the mesoscopic scale, and the corresponding experimental observation process is extremely complicated. Moreover, for CFRP with different material types and structures, repeated cutting experiments are required to fit the relationship between cutting speed and subsurface damage.

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