不同缘条宽度复合材料C型柱轴向压缩吸能特性

Energy-absorption characteristics of composite C-channels with different flange widths under axial compression

针对不同缘条宽度的复合材料薄壁C型柱开展准静态轴向压缩实验,通过CT扫描分析其轴向压缩失效模式及破坏机理,利用吸能特性评估参数分析不同缘条宽度对C型柱轴向压缩吸能特性的影响。建立复合材料C型柱单层壳模型与多层壳模型,通过对比轴向压缩仿真与实验获得的失效模式、载荷-位移曲线以及吸能特性评估参数,来验证模型有效性。结果表明:缘条宽度对C型柱轴向压缩失效模式和吸能特性的影响较大,缘条宽度为25 mm和30 mm的C型柱在轴向压缩载荷作用下能够以稳态渐进的形式发生失效,且吸能特性较好;C型柱多层壳模型仿真获得的平均压缩载荷、总吸能及比吸能偏差在5%以内,单层壳模型仿真获得的平均压缩载荷、总吸能及比吸能偏差在8%以内,多层壳模型轴向压缩仿真精度更高。

Quasi-static axial compression experiments were conducted on the composite thin-walled C-channels with different flange widths.The axial compression failure modes and failure mechanisms were analyzed through CT scanning,and the effects of different flange widths on the axial compression energy-absorption characteristics of C-channels were evaluated by using the energyabsorption indexes.The single-layer shell model and multi-layer shell model of composite C-channel were established,and the finite element models were verified by comparing the failure modes,load-displacement curves and energy-absorption indexes.The results show that the flange width has a significant effect on the axial compression failure modes and energy-absorption characteristics of Cchannels.The C-channels with flange widths of 25 mm and 30 mm are failed in the stable and asymptotic manner under the axial compression loads and have good energy-absorption characteristics.The deviation of mean crushing force,energy absorption and specific energy absorption obtained by the multi-layer shell model is within 5%,while that obtained by the single-layer shell model is within 8%,which indicating that the multi-layer shell model of C-channel has the higher simulation accuracy.