Modeling the Compressive Buckling Strain as a Function of the Nanocomposite Interphase Thickness in a Carbon Nanotube Sheet Wrapped Carbon Fiber Composite
Modeling the Compressive Buckling Strain as a Function of the Nanocomposite Interphase Thickness in a Carbon Nanotube Sheet Wrapped Carbon Fiber Composite
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DOI：
10.1115/1.4044086
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发表时间：
2019-10
期刊：
影响因子：
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通讯作者：
Xuemin Wang;T. Xu;Rui Zhang;M. J. Andrade;Pruthul Kokkada;D. Qian;Samit Roy;R. Baughman;Hongbing Lu
中科院分区：
文献类型：
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作者：
Xuemin Wang;T. Xu;Rui Zhang;M. J. Andrade;Pruthul Kokkada;D. Qian;Samit Roy;R. Baughman;Hongbing Lu
聚合物基复合材料具有较高的拉伸强度。然而，由于纤维/基质界面剪切强度较弱，其抗压强度远低于抗拉强度。我们最近开发了一种新的方法来制备复合材料，方法是用碳纳米管片将单个碳纤维或纤维丝束包裹起来，然后将它们浸渍到基质中，在不降低碳纤维拉伸强度的情况下提高界面剪切强度。在这项研究中，通过理论分析确定了碳纳米管嵌入到基质中形成的纳米复合材料界面区域的合适厚度。纤维被模拟为各向异性弹性材料，纳米复合材料界面区域和基体被视为各向同性。解决了单向复合材料在压缩作用下的微屈曲问题。将解析解与有限元模拟结果进行了比较，验证了解析解的正确性。结果表明，各向异性碳纤维复合材料的屈曲临界载荷比各向同性纤维复合材料的低，这是因为纤维的横向性能较低。确定了纳米复合材料界面区的最佳厚度，为利用定向碳纳米管作为纳米复合材料界面区的填料制备复合材料提供了指导。
Polymer matrix composites have high strengths in tension. However, their compressive strengths are much lower than their tensile strengths due to their weak fiber/matrix interfacial shear strengths. We recently developed a new approach to fabricate composites by overwrapping individual carbon fibers or fiber tows with a carbon nanotube sheet and subsequently impregnate them into a matrix to enhance the interfacial shear strengths without degrading the tensile strengths of the carbon fibers. In this study, a theoretical analysis is conducted to identify the appropriate thickness of the nanocomposite interphase region formed by carbon nanotubes embedded in a matrix. Fibers are modeled as an anisotropic elastic material, and the nanocomposite interphase region and the matrix are considered as isotropic. A microbuckling problem is solved for the unidirectional composite under compression. The analytical solution is compared with finite element simulations for verification. It is determined that the critical load at the onset of buckling is lower in an anisotropic carbon fiber composite than in an isotropic fibfer composite due to lower transverse properties in the fibers. An optimal thickness for nanocomposite interphase region is determined, and this finding provides a guidance for the manufacture of composites using aligned carbon nanotubes as fillers in the nanocomposite interphase region.