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A VIEW ON MULTI-SCALE MECHANICAL PROBLEMS FROM COLUMBIA TRAGEDY

BAI Yilong WANG Haiying KE Fujiu XIA Mengfen (LNM, Institute of Mechanics, CAS, Beijing 100080, China) (Department of Applied Physics, Beijing University of Aeronautics & Astronautics, Beijing 100083, China) (Department of Physics, Peking University, Beijing 100871, China)  
Many multi-scale mechanical problems concerning multiple physical levels are crucial in aeronautic and astronautic safety. Multi-scale problems are great challenges with respect to current mechanical concepts and theories. In this paper, taking spallation in Al alloy and brittle fracture in rocks as typical examples, we discuss typical features, difficulties and potential solutions to multi-scale problems. It is shown that a reasonable characterization and treatment of the trans-scale coupling and trans-scale sensitivity are keys to the multi-scale problems.
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