Center for Composite Materials, Harbin Institute of Technology, Harbin, China.
Phys Chem Chem Phys. 2013 Feb 28;15(8):2764-73. doi: 10.1039/c2cp44033d. Epub 2013 Jan 16.
The wrinkling characteristics of a rectangular graphene membrane under local tension are studied in this paper based on the continuum theory. The characteristics of the primary bifurcation and secondary wrinkling are studied to discover the physics of graphene wrinkling. The wrinkling geometry is predicted by a continuum theory model. The results reveal that the first wrinkle is formed at the primary bifurcation point. The non-uniform stretch-induced compressed effects, that originate from both the loaded portion and the clamped edges, buckle the graphene to form the first wrinkle. Secondary wrinkling is generated on the boundary of the wrinkled regions and the slack regions near the loaded portion in the post-wrinkling stage is the intrinsic nature of the wrinkling rupture and evolution of graphene. In addition, the length of the loaded portion and the aspect ratio of graphene have great effects on the wrinkling characteristics. These results are tremendously useful in understanding the intrinsic nature of the structural instability of graphene.
本文基于连续介质理论研究了局部拉伸下矩形石墨烯膜的起皱特性。研究了主分叉和二次起皱的特性，以揭示石墨烯起皱的物理机制。通过连续介质理论模型预测了起皱的几何形状。结果表明，第一条褶皱在主分叉点形成。非均匀拉伸引起的压缩效应，源于加载部分和固定边缘，使石墨烯弯曲形成第一条褶皱。在起皱后期，二次褶皱出现在起皱区域的边界和加载部分附近的松弛区域上，这是石墨烯起皱破裂和演化的固有特性。此外，加载部分的长度和石墨烯的纵横比对起皱特性有很大的影响。这些结果对于理解石墨烯结构不稳定性的内在性质非常有用。
