Study On The Simulation Modeling Method And Energy Absorption Mechanism Of Thin-walled Composite Structures

Numerical simulation combined with fewer tests is becoming an effect method to study the crashworthiness and failure mechanism of composite structures. Therefore, a simulation modeling method which is fit for test data has become a significant research work.It is based on the crushing energy absorption data of thin-walled composite energy-absorbing structures in this paper, the modeling approach of MAT₀54 material model in LS-Dyna software is analyzed, and the effect of the geometry and lay up changes on the energy absorption characteristics of T700/epoxy composite tubes is researched based on FEM numerical simulation. The main contents are listed as follows:?1? Carrying capacity, failure modes and energy absorption capacity are obtained from the quasi-static crush test of T700 / epoxy prepreg thermoforming thin-walled composite tube structures, which provide a reference to crashworthiness design of thin-walled composite energy-absorbing structures, but also provide the experimental data which will be used in the following numerical simulation modeling.?2? FEM model which is based on the Chang-Chang failure criteria for the quasi-static crushing simulation of T700/epoxy composite tube is created in LS-Dyna software. After the accuracy of the finite element model is verified, material model parameters and key simulation modeling parameters of the MAT₀54 material model is analyzed and the simulation modeling method of thin-walled composite energy absorption structures is studied.?3? The accurate finite element simulation model is obtained through comparing simulation results with experimental test data, and then the influence of the diameter-thickness ratio and diameter-height ratio on energy absorption characteristics of composite tubes is studied with numerical analysis method.?4? The effect of fiber layer? fiber layer angle and fiber layer ratio? on energy absorption characteristics of composite tubes is studied which is based on the ideal finite element model.