The Design And Simulation Analysis Of Thermoplastic Continuous Fiber Hybrid Laminate Auto Body Parts

With the continuous iteration of automobile industry technology and the combination of new materials,new structures and new processes,automobile lightweight has become a key part of automobile design.The use of lightweight automotive materials can reduce environmentally unfriendly gas emissions and improve the combustion efficiency of automotive fuels,which is an important development phenomenon for automotive materials in the future.At the same time,in order to solve the problem of environmental pollution,a large number of automobile manufacturers have gradually begun to use thermoplastic carbon fiber composite materials.Compared with thermosetting carbon fiber composite materials,thermoplastic fiber materials also have the advantages of recyclability and low pollution.However,the high price has always hindered the widespread use of carbon fiber,and carbon fiber is less tough than other composite materials.Hybrid composite materials have the advantages of improving material toughness and reducing material costs.However,the experiment of hybrid composite materials is complicated and requires efficient failure criteria to guide.At present,there are difficulties in the research of hybrid laminate composite materials.This paper adopts the internationally recognized mechanical standard part box model,which has the characteristics of multiple corners,multiple protrusions,and deep drawing to simulate auto parts.On the basis of the existing failure criteria,a new set of failure criteria was improved,and benchmarking was conducted through the load-displacement relationship obtained from the dynamic load test and the static load test.Afterwards,numerical simulation methods are used to predict the dynamic and static mechanical properties of the hybrid ply box.In this paper,a 12-layer carbon fiber square box is prepared with a ply angle of[0/90]_6s,and a dynamic drop weight test is performed on the carbon fiber composite square box.The maximum impact load and energy absorption are measured,and then the static load crush experiment is performed to determine the maximum compressive load.After that,the basic mechanical properties such as the tensile strength of carbon fiber and glass fiber composite materials were measured by tensile test,compression test,and shear test under the ASTM standard.Based on the measured basic mechanical parameters based on Abaqus finite element simulation software,a finite element simulation model for dynamic load drop weight and static load collapse of a carbon fiber composite box was established.Then based on Abaqus,a failure criterion with higher criterion accuracy is improved,so that the simulation result of the established finite element model is closer to the real test situation.Afterwards,the dynamic load and static load experiment results and simulation results of the carbon fiber square box were benchmarked to prove that the new failure criterion has higher simulation accuracy.Establish the finite element model of the mixed layered box,the layering angle of the 10-layer mixed layered box is[0/90/0/90/0/90/90/0/90/0](from outside to inside front 4 Layer of glass fiber,the rear 6 layers of carbon fiber).Compare the simulation calculation results of the hybrid square box with the simulation calculation results of the carbon fiber composite square box,and analyze the load-displacement curve,maximum impact load,energy absorption and maximum pressure load under dynamic and static loads.The advantages of hybrid square boxes and carbon fiber square boxes in dynamic and static mechanical properties are analyzed.The results show that the new failure criterion can have better simulation results in the numerical analysis of the composite material of the hybrid layer,and the new failure criterion can be used to guide the test and production.Under the numerical simulation calculation of the Vumat subroutine using the new hybrid criterion,the maximum impact load of the hybrid box in the dynamic load drop weight simulation is almost no drop compared with the carbon fiber composite box,and the hybrid box has a higher value.Of energy absorption.In the static load collapse simulation,the maximum compressive load of the hybrid square box is better than that of the carbon fiber composite square box,and at the same time exhibits a higher pressure-bearing capacity in a larger displacement range.Therefore,it is concluded that the use of carbon fiber/glass fiber hybrid layup can be used to design and produce auto parts,and it can save costs by replacing carbon fiber with a certain proportion of glass fiber without degrading the mechanical properties.