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Multiscale modeling of interface debonding effect on mechanical properties of nanocomposites

机译：界面脱粘效应对纳米复合材料力学性能的多尺度建模

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Mechanical behavior of SiO2 nanoparticle-epoxy matrix composites was investigated via finite element analysis with an emphasis on the nanofiller-interphase debonding effect using a three-dimensional nanoscale representative volume element (RVE). The new model, in which a cohesive zone material (CZM) layer is considered as an inclusion-interphase bonding, can be applied to polymer nanocomposites reinforced by inclusions of different forms, including spherical, cylindrical, and platelet shapes. Upon validation by experimental data, the model was used to study the effects of interphase properties, nanoparticle size, and inclusion volume fraction on the mechanical properties of nanocomposites. According to the results, taking into account the inclusion-interphase debonding provides more precise results compared with perfect bonding, especially in nanocomposites with nanoparticles of smaller size. Moreover, the outcomes disclosed that the amount of changes in the elastic modulus by particle size variation is higher when the relative thickness (the interphase thickness to the particle diameter ratio) increases. For relative thicknesses lower than a critical value, the particle size and the interphase properties have negligible effect on the elastic modulus of the nanocomposite, and the elastic modulus of nanocomposite mostly depends on nanofiller content. POLYM. COMPOS., 38:789-796, 2017. (c) 2015 Society of Plastics Engineers
机译：通过有限元分析研究了SiO2纳米颗粒-环氧基复合材料的力学行为，重点研究了使用三维纳米尺度代表体积单元（RVE）的纳米填料-相间脱键效应。新模型将内聚区材料（CZM）层视为夹杂物-相间键合，可应用于由不同形式的夹杂物增强的聚合物纳米复合材料，包括球形、圆柱形和片状。经实验数据验证，该模型用于研究相间性能、纳米粒径和夹杂体体积分数对纳米复合材料力学性能的影响。根据结果，与完美键合相比，考虑到夹杂物-相间脱键提供了更精确的结果，特别是在具有较小尺寸纳米颗粒的纳米复合材料中。此外，研究结果表明，当相对厚度（相间厚度与粒径比）增大时，粒径变化对弹性模量的变化量越大。对于相对厚度低于临界值，粒径和相间性能对纳米复合材料弹性模量的影响可以忽略不计，纳米复合材料的弹性模量主要取决于纳米填料含量。波利姆。作曲， 38：789-796， 2017.（c） 2015 年塑料工程师学会

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