有关骨替代材料的动态力学性能测试

The Study of Dynamic Mechanical Properties of the Bone Substitute Materials

测量了骨替代材料的动态力学性能参数,以比较研究与骨的力学性能差别。利用分离式霍普金森压杆测量了3种不同骨替代材料的动态应力应变曲线、相应的表观强度极限、表观弹性模量等参数。实验结果表明,动态抗压强度大于静态抗压强度,3种骨替代材料的抗压强度和动态表观弹性模量比密质骨的抗压强度和弹性模量要小一个数量级。这意味着这类骨替代材料被植入到活体后,在其内部生长的骨组织和胶原纤维需大幅度提高强度和刚度,才能使其起到和活体骨相同的作用。

The dynamic mechanical properties of bone substitutes were tested for comparing with that of natural bone.The apparent elastic moduli,apparent ultimate strength and dynamic stress-strain diagrams of three kinds of bone substitutes were obtained by Split Hopkinsion pressure bar（SHPB） technique.The results indicated that dynamic compressive strength of substitutes were higher than their static compressive strengths.The compressive strength and apparent elastic moduli of the three bone substitutes were one order of magnitude lower than those of cortical bone.This suggests that after these bone substitutes are implanted in a body,new bone tissue and collagen fibers grew in them must increase their strength and rigidity greatly to make them have the same function as the bone.