1. Department of Engineering Mechanics, Zhejiang University, Hangzhou, China
2. State Key Lab of CAD & CG, Zhejiang University, Hangzhou, China
3. Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province, Zhejiang University, Hangzhou, P.R. China
4. Soft Matter Research Center, Zhejiang University, Hangzhou, P.R. China
5. Department of Civil Engineering, University of Siegen, Siegen, Germany