title: Dimension-controlled formation of crease patterns on soft solids.
abstract: Soft solids such as PDMS or silicone are widely needed in many advanced applications such as flexible electronics and medical engineering. The ability to control the structure and properties of the surface of soft solids provides new opportunities in these applications. In particular, mechanical loading induced elastic instability is a convenient method to control the surface morphology. The critical strain at which the crease nucleates is experimentally measured under plane strain conditions, and is found to be consistent with that predicted by nonlinear large deformation theory of creases. Under compressive loading, we find that silicone undergoes a transition of creasing pattern from a single channeling or double channeling crease to an unchanneling crease, depending on the specimen's width and height. Finite element simulations are performed to better understand the underlying mechanism of creasing, wherein a relationship between the depth and spacing of the creases is established. It is found to be in good agreement with the experimental data obtained.
authors.affiliation: College of Aerospace Engineering, Chongqing University, Chongqing, China. stang@cqu.edu.cn.
authors.forename: Shan
authors.initials: S
authors.lastname: Tang
authors.affiliation: College of Aerospace Engineering, Chongqing University, Chongqing, China. stang@cqu.edu.cn and College of Material Science and Engineering, Chongqing University, Chongqing, China.
authors.forename: Bo
authors.initials: B
authors.lastname: Gao
authors.affiliation: College of Aerospace Engineering, Chongqing University, Chongqing, China. stang@cqu.edu.cn.
authors.forename: Zhiheng
authors.initials: Z
authors.lastname: Zhou
authors.affiliation: College of Aerospace Engineering, Chongqing University, Chongqing, China. stang@cqu.edu.cn and College of Material Science and Engineering, Chongqing University, Chongqing, China.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Gu
authors.affiliation: Institute of High Performance Computing, A*STAR, Singapore, 138632, Singapore. guotf@ihpc.a-star.edu.sg.
authors.forename: Tianfu
authors.identifier: http://orcid.org/0000-0003-2828-3631
authors.initials: T
authors.lastname: Guo