陈瑶教授课题组在Applied Physics Letters 发表研究论文

发布日期：2014-10-31

我院陈瑶教授课题组研究生张律以第一作者身份撰写的题为“Interfacial stress transfer in a graphene nanosheet toughened hydroxyapatite composite” (Applied Physics Letters, 2014,105(16):161908)，于2014年10月20日在国际学术期刊Applied Physics Letters（SCI影响因子3.515）在线发表，陈瑶教授为该论文的通讯作者。这是张律同学继去年在国际学术期刊Carbon（SCI 影响因子6.16）发表学术论文后的又一篇SCI论文。

石墨烯优异的力学性能及其大的比表面积，被认为是复合材料中极具潜力的纳米增强相及增韧相。众所周知，复合材料中石墨烯/基体相界面的失效行为是影响其力学性能的重要因素。该研究论文根据石墨烯的形状及尺寸特征修正了著名了剪-滞模型，研究了石墨烯纳米片层数对石墨烯/陶瓷基体相界面处拉应力及剪切应力的影响规律。计算出石墨烯拔出时的临界能量释放率对该复合材料断裂韧性改善的贡献。该研究有助于深入理解石墨烯/陶瓷基复合材料的界面力学行为和增韧机制。

Interfacial stress transfer in a graphene nanosheet toughened hydroxyapatite composite
L. Zhang,1 X. G. Zhang,1 Y. Chen,1,a) J. N. Su,1 W. W. Liu,1 T. H. Zhang,2 F. Qi,1 and Y. G. Wang1
1School of Mechanical and Electric Engineering and Collaborative Innovation Center of Suzhou Nano Science
and Technology, Soochow University, 215123 Suzhou, China
2College of Mechanical Engineering, Zhejiang University of Technology, 310014 Hangzhou, China
(Received 19 May 2014; accepted 13 October 2014; published online 23 October 2014)

In recent years, graphene has emerged as potential reinforcing nanofiller in the composites for structural engineering due to its extraordinary high elastic modulus and mechanical strength. As recognized, the transfer of stress from a low modulus matrix to a high-modulus reinforcing grapheme and the interfacial behavior at a graphene-matrix interface is the fundamental issue in these composites. In the case of graphene nanosheet (GNS) reinforced hydroxyapatite (HA) composite, this research presented analytical models and simulated that the number of graphene layers of GNSs has little effect on the maximum axial stress ([1]0.35 GPa) and the maximum shear stress ([1]0.14 GPa) at a GNS-HA interface, and the energy dissipation by GNS pull-out decreases with increasing the number of graphene layers due to weak bonding between them. Also, GNS-HA interfacial delamination and/or GNS rupture were also indentified to be the two key failure mechanisms. The computed results are expected to facilitate a better understanding of the interfacial behavior at a GNS-ceramic interface and to achieve tough ceramics reinforced with GNSs.

AIP Publishing LLC. [http://dx.doi.org/10.1063/1.4900424]