Objective To investigate the cause and process of crack generation and propagation in fretting wear of bone and to study the fretting wear mechanism between prostheses and bones.

目的探索骨组织在微动过程中裂纹产生和扩展的原因及过程，弄清假体-骨组织界面微动磨损的机理。

In the view of the concrete's minute construction, cement and mortar encircled bone, there is tiny crack on interface of bone and mortar under temperature load.

从混凝土组成的细观角度出发，研究水泥砂浆包围的骨料，在温度荷载作用下首先在骨料与砂浆的界面上产生界面微裂缝。

Objectives: Through observing skull bottom non-hole crack weak area, to provide anatomy foundation for the ultrasonic investigation in the skull and bone fracture in the skull bottom.

目的：观测颅底非孔裂薄弱区，为颅底骨折及颅内超声探查提供解剖学基础。