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- 2017
纤维缠绕复合材料夹芯圆柱体准静态压缩吸能机制
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Abstract:
提出并设计了一种新型纤维缠绕复合材料夹芯圆柱体吸能结构单元。为探讨其在准静态压缩载荷作用下初始损伤的产生、扩展及演变规律，基于ABAQUS建立该单元数值分析模型，并开展了准静态压缩试验。数值模拟与试验现象综合分析表明，准静态压缩载荷作用下单元结构的响应具有三阶段特征，包括初始线弹性压缩阶段、渐进损伤阶段和结构破坏阶段。固体浮力芯材在压缩载荷作用下产生塑性损伤变形和剪切断裂破坏，纤维缠绕复合材料表层在芯材横向膨胀效应引起的环向应力作用下发生环向纤维的拉伸断裂破坏，导致单元结构稳态吸能过程的终止。研究结果表明，该单元比吸能效率远高于传统的复合材料圆柱壳结构。 The new energy absorption structure element of filament wound composite sandwich cylinder has been put forward and designed. In order to investigate the damage formation, extension and evolvement law of the element, the numerical analysis model was built by ABAQUS and the experiments were conducted under quasi-static compression loading. Comprehensive analysis of numerical simulation and experimental results show that the quasi-static compression process can be divived into three stages, including the initial elastic compression stage, the progressive damage stage and the structural damage stage. The plastic damage deformation and shear failure of solid buoyant core occur under compression load. Then steady energy absorption process is terminated by the tensile breaking of hoop fibers owing to transverse expansion effect of solid buoyant core. The results show that the energy absorption efficiency of this element is much higher than that of the traditional composite culindrical shell structure. 国家自然科学基金面上项目（51479205）
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