Shear-Induced Anisotropic Wrinkling and Sliding Instability in Van Der Waals Bilayers
Guangfei Zhu, Rumeng Liu, Lifeng Wang
Abstract: Strain engineering is a crucial approach for controlling the physical properties of van der Waals (vdW) materials. However, understanding the mechanical response of structures under strain remains a significant challenge. This study investigates the in-plane shear-induced wrinkling process of a bilayer vdW structure by molecular dynamics method. The mechanical mechanism is further validated with the assistance of a continuum-discrete model. The results demonstrated that out-of-plane deformation induces interlayer sliding, causing sliding instability. Interlayer sliding induces the formation of SP barrier rings composed of domain walls. The threefold rotational symmetry of the interlayer sliding breaks the symmetry of the wrinkling pattern. The shear direction also introduces anisotropic effects on wrinkle formation. The sliding instability of the twisted structure is correspondingly weakened. In addition, the onset of wrinkling and the transition timing during dynamic shear processes are significantly influenced by temperature and shear strain rate. These results provide new insights into the out-of-plane deformation mechanisms of layered vdW materials and offer novel approaches for strain engineering.
文章链接：https://www.webofscience.com/wos/woscc/full-record/WOS:001629668800003
