Study On Door Lightweight Of Composite Materials

For nearly half a century,Energy and environmental issues are driving the vehicle lightweight forward.It has gradually formed three ways to realize automobile lightweight: structural optimization of automobile and parts,use of lightweight composite materials and improvement of existing technology.The door is one of the important parts of the car,its lightweight research is of great significance for vehicle lightweight research.This project relies on a enterprise body lightweight research project,the door parts and components steel material is replaced by composite material by quality substitution.Based on the steel door sagging stiffness,torsional stiffness,stripline stiffness and constrained modal performance optimized the composite door.At the same time,the performance of the optimized composite door was verified by stiffness and modality.The main work of this topic is as follows:1.Under the premise of strictly controlling the quality of the grid and rationally selecting the analog connection method,establish a more accurate steel material door numerical analysis model in the HyperMesh pre-processing module.At the same time,the corresponding material properties and unit properties are assigned to the components of the steel material door.In the OptiStruct solver,the sagging stiffness,torsional stiffness,stripline stiffness and constrained modal performance of steel door are numerically analyzed.Obtain the initial stiffness and modal performance parameters and compare with the target performance parameters of the enterprise2.Replace the composite parts of the steel material door parts according to the principle of quality substitution.And then obtaining the thickness properties of the components of the composite door to ensure that the strength of the composite door is substantially constant relative to the steel material door.Under the premise of considering the particularity of composite joints,according to the composite material modeling method,the physical layer of composite door is visualized,establish a more accurate simulation analysis model.Finally,according to the initial stiffness,modal performance parameters and enterprise target performance parameters of steel door,the optimal target value of composite door is established.pave the way for subsequent composite optimization.3.Under the premise of ensuring that the door stiffness and modal performance are unchanged or improved,three stages of continuous optimization of the composite door.that is,free size optimization,optimization of the number of layers at each angle,and optimization of the layup sequence.The optimization result of the previous stage is the beginning of the next stage optimization.Through three stages of continuous optimization,the optimal ply area and sequence are obtained,so as to realize the lightweight research of the composite door.Compound material door model after lightweight carry out Perform mesh interference,penetration,quality inspection and local fine-tuning to improve the accuracy of numerical analysis.In the OptiStruct solver,the sagging stiffness,torsional stiffness,stripline stiffness and constrained modal performance of composite door are numerically analyzed.Obtain the stiffness and modal performance parameters of the composite door and verify that the requirements are met.Finally,comparing stiffness and modal performance parameters of composite door with steel door,thereby verifying whether the door lightweighting result is valid.