Abstract Graphene has been widely used as new generation reinforcing nanofiller to achieve significantly improved mechanical properties in composites. However, its reinforcing effect has been considerably affected by the poor interfacial strength between graphene and the matrix. By using molecular dynamics simulations, the present work explores an effective route to improve the interfacial shear strength (ISS) of graphene sheets through the introduction of mechanically induced wrinkles that are formed by applying shear/compressive strains to graphene. The slide-out tests of a wrinkled graphene sliding over the graphene substrate show that the strain-induced wrinkles in graphene slider gives rise to larger surface roughness which leads to stronger interfacial interactions between graphene layers and consequently, significant improvement in ISS. Compared with compression induced wrinkles, shear induced wrinkles are found to be much more effective in enhancing ISS. Our results indicate that applying mechanical pre-strain, in particular, shear strain to graphene is a very useful strategy to improve its reinforcing effect in composites.

中文翻译：

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通过应变诱导皱纹提高石墨烯片之间的界面剪切强度

摘要 石墨烯已被广泛用作新一代增强纳米填料，以显着提高复合材料的机械性能。然而，石墨烯与基体之间较差的界面强度对其增强效果有很大影响。通过使用分子动力学模拟，本工作探索了通过引入机械诱导皱纹来提高石墨烯片的界面剪切强度 (ISS) 的有效途径，这些皱纹是通过向石墨烯施加剪切/压缩应变而形成的。在石墨烯基板上滑动的起皱石墨烯的滑出测试表明，石墨烯滑块中应变引起的皱纹会产生更大的表面粗糙度，从而导致石墨烯层之间更强的界面相互作用，从而显着改善 ISS。与压缩引起的皱纹相比，剪切引起的皱纹被发现在增强 ISS 方面更有效。我们的结果表明，将机械预应变，特别是剪切应变应用于石墨烯是一种非常有用的策略，可以提高其在复合材料中的增强效果。