1. Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, P. R. China.
2. Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian 116024, P. R. China.
3. Physique et Mécanique des Milieux Hétérogènes, UMR 7636 du CNRS, ESPCI, PSL Research University, 75005 Paris, France.