摘要
基于均匀化理论,建立了碳纳米管增强Nb-Si基复合材料的代表体积元模型,采用ABAQUS有限元分析软件建立有限元模型,模拟研究了碳纳米管增强Nb-Si基复合材料界面上的应力分布及碳纳米管拔出机制,分析了碳纳米管的长度和界面强度对界面应力的传递和拔出载荷的影响规律。结果表明,在碳纳米管增强Nb-Si基复合材料受载失效过程中,碳纳米管的拔出可分为3个阶段即界面的完全粘接、开始脱粘和脱粘拔出等。碳纳米管的长度对界面应力的传递和拔出力均有一定的影响,而界面结合强度主要影响碳纳米管的拔出力,而且碳纳米管的长度和界面强度的增大都会使碳纳米管的拔出载荷增大。
Based on homogenization theory, the representative volume element model of carbon nanotube reinforced Nb-Si matrix composites was established. ABAQUS finite element analysis software was used to establish the finite element model. The stress distribution and pull-out mechanism at the interface of Nb-Si matrix composites reinforced by carbon nanotubes were simulated. The influence of the length and interface strength of carbon nanotubes on the interfacial stress transfer and pull-out load was analyzed. The results show that, during the loading failure of carbon nanotube reinforced Nb-Si matrix composites, the pull-out of CNTs can be divided into three stages: the complete bonding of the interface, the beginning of debonding and the debonding and pull-out. The length of carbon nanotubes(CNTs) has a certain effect on the transfer of interfacial stress and pull-out force, and the interfacial bonding strength mainly affects the pull-out force of CNTs. The pull-out load increases with the increase of the length and interface strength of CNTs.
引文
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