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针对玻璃/碳纤维增强聚合物基纳米复合材料在冲击工程领域未普及使用的问题,为加快其应用速度,对该材料板件结构的冲击力学特性进行了研究,对比分析了锤头形状对其动力学响应的影响。基于复合材料强度和刚度理论,推导了玻璃/碳纤维增强聚酰胺/碳纳米管复合材料的正交各向异性的等效力学参数;利用非线性显式有限元方法建立了其板件结构的冲击力学模型,通过数值模拟其动态冲击过程,观察了其内部应力波的传播过程,测量了其动力学响应。研究结果表明:应力波从锤头与复合材料板的接触区域开始,逐渐向板件外边界传递。并且随着冲击过程的进行,板内应力峰值增大。与玻璃纤维增强相相比,碳纤维增强纳米复合材料板的刚度增强,冲击加速度峰值增大。 相似文献
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The excellent mechanical properties of carbon nanotubes make them potential candidates for engineering application. In this paper, the impact and failure behaviors of single-walled carbon nanotubes (SWCNTs) are investigated. The effects of diameter, length, and chirality on their energy absorption characteristics under lateral impact and axial crush are studied. By integrating the principle of molecular structural mechanics (MSM) into finite element method (FEM), the locations and directions of fracture process can be predicted. It is shown that the specific energy absorption (SEA) of SWCNTs is 1–2 order of magnitude higher than that of the ordinary metallic materials and composites in axial impact, indicating that carbon nanotubes are promising energy absorption materials for engineering applications. 相似文献
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