Bonfield W
Department of Materials, Queen Mary College, London, U.K.
J Biomech. 1987;20(11-12):1071-81. doi: 10.1016/0021-9290(87)90025-x.
As cortical bone is a semi-brittle solid, its fracture is dependent not only on the magnitude of the applied stress, but also on the nature of any intrinsic or introduced cracks. Consequently a variety of fracture mechanics techniques have been utilised to evaluate the fracture toughness of cortical bone, including the single edge notched, centre notched cylindrical and compact tension methods, and values have been established for the critical stress intensity factor (Kc) and the critical strain energy release rate (Gc). The Kc and Gc values obtained depend on the orientation of the cortical bone, as well as on bone density, the velocity of crack propagation and specimen geometry. The significance of these fracture mechanics parameters for cortical bone is critically reviewed.
由于皮质骨是一种半脆性固体，其骨折不仅取决于所施加应力的大小，还取决于任何固有或引入裂纹的性质。因此，已经采用了多种断裂力学技术来评估皮质骨的断裂韧性，包括单边切口、中心切口圆柱和紧凑拉伸方法，并且已经确定了临界应力强度因子（Kc）和临界应变能释放率（Gc）的值。所获得的Kc和Gc值取决于皮质骨的取向，以及骨密度、裂纹扩展速度和试样几何形状。对这些皮质骨断裂力学参数的意义进行了批判性综述。
