复合材料机身C型柱准静态压溃仿真及失效模式

Quasi-Static Crushing Simulation Research and Failure Mode Analysis of Composite Thin-Walled C-Channel Specimen

为了研究复合材料机身薄壁C型柱结构轴向压溃吸能特性、失效模式及C型柱多层壳单元建模方法,建立多层壳单元有限元模型,基于准静态轴向压溃实验结果进行对比验证。结果表明:C型柱多层壳单元模型能够在一定程度上模拟层间分层失效及压溃过程中的局部弯曲变形和层束弯曲失效模式;仿真与实验的载荷-位移曲线吻合性较好,压溃初始峰值载荷,比吸能以及压溃均值偏差较小;但C型柱结构压溃初始峰值载荷较大,载荷效率较低,需通过优化设计进一步降低其初始载荷峰值。

To study the crushing energy-absorbing characteristics and failure mode, the multi-shells finite element model of composite thin-walled C-channel specimen was established based on the quasi-static crushing test results. The simulation results show that the de-lamination failure, local buckling and beam bending failure of C-channel specimen can be simulated with the multi-shells finite element model. The load-displacement curve well fits the test results, and the deviation of initial peak load （Fmax） , specific energy absorption （Es） and crushing mean load （ Fmean） is small compared with the test results. The initial peak load of C-channel specimen is larger and the load efficiency is lower, so it is necessary to further reduce the initial peak load by the design optimization.