Analysis And Optimization Of 2.5D Woven Composite Leaf Spring Structure

The traditional automobile leaf springs are mainly made of fatigue-resistant spring steel.However,as the requirements for meeting the energy-saving and reducing fuel consumption of automobiles have been continuously improved,the lightweighting of automobiles has gradually become the focus of research.Because advanced composite materials have the advantages of light weight,high specific strength,corrosion resistance,good shock absorption,and strong designability,they are continuously used in the automotive industry.However,the current production of composite material leaf springs is mostly based on In the form of laminates,the composite fiber layers and layers of this structure are easily separated and broken with low damage tolerance and inhomogeneous mechanical properties.In order to increase the shear strength between layers,the overall2.5D woven is used in this paper.The structure acts as a reinforcement for the composite material,effectively improving the shear strength between the layers and having superior properties to the laminated material.The fiber bundles are interwoven in two-dimensional space,there is no problem of "layers",and the ability to resist damage and impact is also enhanced.Because 2.5D woven structures are rarely used as reinforcements in leaf springs currently on the market,it is of great significance to perform parametric modeling and numerical simulation of integral components of 2.5D woven composite leaf springs.In this paper,a certain type of engineering vehicle with leaf springs with primary and secondary springs is studied.First of all,according to the requirements of the preliminary design of the leaf spring structure,using ANSYS software based on finite element area superposition technology,using the APDL language as a tool to establish a 2.5D woven composite leaf spring integral component finite element model,including 2.5 D.The woven structure reinforcement and the resin matrix realize the parameterization of the finite element model;secondly,the mechanical model of the composite material leaf spring is established,and the mathematical model is established according to the laminating plate theory,and the strength and stiffness are used as constraints,and the quality is The minimum is the objective function.Using ANSYS software for optimization,a leaf spring that satisfies the conditions is obtained and the mass is reduced by 74% relative to the leaf spring.Then,the static analysis of the optimized 2.5D woven composite leaf spring is performed,including preloading.In the tight process and full load condition,the rationality of the optimized structure was verified by the stiffness calculation.Finally,based on Visual Basic6.0,the finite element analysis software of the 2.5D woven composite material leaf spring was developed.The software will be cumbersome for the ANSYS software.The operation converts the operation of the visualization window,and calls the ANSYS software in the background to realize the model parameter of the 2.5D woven composite leaf spring.Modify,optimize the structure,static analysis,automatically generate the analysis result reporting.