石墨烯增强弹性体纳米复合材料的变形与撕裂
Deformation and tearing of graphene-reinforced elastomer nanocomposites
摘要：
对于不同弹性体的应用而言，抗撕裂破坏性是一项至关重要的机械性能。在这项工作中，石墨烯纳米片（GNP）被引入到氟弹性体（FKM）矩阵的目的是提高其抗撕裂性。通过纯剪切试验，通过撕裂的断裂能进行了评估。结果表明，撕裂能随GNP体积分数的增加而线性增加。在最大GNP含量下，抗撕裂性高3倍，表明来自GNP的有效增韧。微观力学的理论分析进行了考虑脱粘和拔出的纳米片作为可能的增韧机制。定量地确定了主要的增韧机制是界面脱粘而不是拔出。通过扫描电子显微镜证实，在变形过程中在薄片端部形成空腔，被发现有助于显着高的界面脱粘能（~1 kJ/m2）。
英文摘要：
The resistance to failure through tearing is a crucial mechanical property for the application of different elastomers. In this work, graphene nanoplatelets (GNPs) were introduced into a fluoroelastomer (FKM) matrix with the aim of improving its tear resistance. The fracture energy through tearing was evaluated using the pure shear test. It was found that the tearing energy increased linearly with the volume fraction of the GNPs. At the maximum GNP content, the tearing resistance was 3 times higher, suggesting efficient toughening from the GNPs. Theoretical analysis of the micromechanics was conducted by considering debonding and pull-out of the nanoplatelets as possible toughening mechanisms. It was determined quantitatively that the main toughening mechanism was debonding of the interface rather than pull-out. The formation of cavities at flake ends during the deformation, as confirmed by scanning electron microscopy, was found to contribute to the remarkably high interfacial debonding energy (~1 kJ/m2).
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