^pand;
Biomaterials;
Laboratory,;
Department;
of;
Applied;
Mechanics,;
School;
of;
Aerospace;
Engineering,;
Beijing;
Institute;
of;
Technology,;
Beijing;
100081,;
China;
^pof;
Engineering;
Mechanics,;
Tsinghua;
University,;
Beijing;
100084,;
China;