人湿尺骨干在冲击压缩实验下的力学性能及规律

目的探讨人湿尺骨密质骨在高应变率下的力学性能及其分布规律。方法用分离式Hopkinson压杆(SHPB)技术对人湿尺骨密质骨进行了应变率在.ε=1.2×103/s条件下的冲击压缩试验。结果尺骨密质骨在高应变率下的力学性能随其纵向位置变化而呈现出中间强两端弱的分布,最强的位置约在距近端1/3处,且近端强于远端。与静态结果的比较表明,尺骨密质骨对应变率有较大的依赖性。结论在冲击压缩力作用下,尺骨的两端,尤其是远端容易骨折。

Impact compressive experiment of human fresh ulnar compact

Objective To investigate the mechanical properties and distributing characteristics of human fresh ulnar compact and its correlation to strain rate.Methods Impact compressive experiment for human fresh ulnar compact bone at high strain rate =1.2×10~(3)/s by Split Hopkinson Pressure Bars(SHPB) were performed.Results The mechanical properties of human fresh ulnar compact bone varied along the longitudinal direction,the ultimate stress,breaking strain and dynamic compressive modulus at middle section were stronger than those at both ends,the strongest at section occurs nearly at the junction of proximal and middle thirds and the properties at the proximal end were much higher than those at the distal end.The ultimate stress at high strain rate was largely dependent on strain rate.Conclusion Under impact compression,the ulnar compact gets fractured easily at both ends,especially at distance section.