结构配置对承受准静态压缩载荷的编-缠-铺混合结构复合材料圆管力学行为的影响

Effect of structure configuration on the mechanical response of braided–wound–laminated hybrid composite circular tubes under quasi-static compression

  • 摘要: 为探究不同混合结构配置下管件压溃响应与损伤演化以及结构配置与力学性能之间的关联机制,本文采用编织-缠绕-铺层-拉挤成型自动化生产线制备了一种编织-缠绕-铺层混合结构碳纤维增强树脂基复合材料圆管并建立混合结构圆管数值模型。通过轴向压溃试验,验证了模型用于混合结构圆管耐撞性能研究的有效性,结果表明:仿真与试验的力-位移曲线和压溃形貌高度吻合,各耐撞性指标误差为2.11%~8.60%。进一步分析编织层位置对混合结构圆管失效模式与各耐撞性指标的影响:最外层编织层对承载能力的影响较大,移除后峰值载荷降低29.99%、均值载荷降低36.82%,更换为铺放层时分别降低25.11%、19.72%,更换为缠绕层时分别降低12.54%、14.72%;而移除或更换最外层编织层后,总吸能提高2.02%~24.70%,比吸能下降12.85%~21.02%。综上,结构配置显著影响编-缠-铺混合结构圆管在准静态压缩下的失效模式与承载-吸能响应,且对各耐撞性指标的影响方向不一致。

     

    Abstract: To investigate the crushing response and damage evolution of tubes with various hybrid structural configurations, as well as the correlation mechanism between structural configuration and mechanical properties, this study fabricated a braided-wound-laid hybrid carbon fiber reinforced polymer circular tube using an automated braiding-winding-pultrusion production line and established a corresponding numerical model. The validity of the model for crashworthiness research on hybrid circular tubes was verified through axial crushing tests. The results demonstrate that the simulated force-displacement curves and crushing morphologies are in excellent agreement with the experimental data, with the errors of various crashworthiness indicators ranging from 2.11% to 8.60%. Further analysis was conducted on the effects of the braided layer's position on the failure modes and crashworthiness indicators of the hybrid tubes. It was revealed that the outermost braided layer has a substantial impact on load-bearing capacity. Its removal leads to a 29.99% reduction in peak crushing force and a 36.82% decrease in mean crushing force. Replacing it with a laid-up layer reduces these forces by 25.11% and 19.72%, respectively, whereas replacing it with a wound layer yields reduction of 12.54% and 14.72%, respectively. Conversely, removing or replacing the outermost braided layer increases the total energy absorption by 2.02%–24.70%, but decreases the specific energy absorption by 12.85%–21.02%. In conclusion, the structural configuration significantly affects the failure modes and load-bearing/energy-absorbing responses of the braided-wound-laid hybrid circular tubes under quasi-static compression, with inconsistent impacts on various crashworthiness indicators.

     

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