【摘要】 本实验应用Hopkinson压杆测量技术,研究了不同含水量人股骨密质骨试件的应变源电动势(SGPs)峰值、时相、与试件表面应变的关系,并结合骨材料力一电理论,探讨SGPs产生的机制。结果显示:密质骨SGPs峰值在动态压缩载荷下为贞值,其绝对值随撞击速度增加而增大,并与骨试件含水量有关,湿润骨SGPs峰值可达-1000毫伏以下,干燥骨SGPs则在-300毫伏左右,湿润骨SGPs时相落后应变440微秒左右,应变恢复至零点所需时间延迟1200微秒以上,干燥骨SGPs无明显滞后或延迟。据此认为:湿骨SGPs产生的机制是骨基质腔隙中电解质液体流动所产生的流动电动势,而干燥骨中胶原的压电效应是SGPs产生的机制。更多还原

【Abstract】 By use of the split Hopkinson Bar testing technique,the strain generated potentials(SGPs) of human femoral cortical bone were measured in different prismatic specimens(fresh,centrifugal,boiling to dry,and stoving to dry) with strain gauges and electrodes.Each specimen was tested under stepwise increased impact load until fail.All the data collection and reduction,including numerical differentiation,were performed by computers or computer controlled equipments.The main results are as follow:(1) Under the impact load(ε≈5-7×10~2/S)the peak value of SGPs is-1024 mv in fresh bone specimens,-450 mv in centrifugal ones,-171 mv in boiling to dry ones,and- 357 mv in stoving to dry ones.(2)The SGPs increased with the enlargement of impacting speed.(3) Wet specimens showed a time delay of 440μs vs.the strain.(4) Dry bone specimens showed no time delay of SGPs vs.the strain.We conclude that SGPs created in wet bones belongs to the mechanism of streaming potentials and SGPs created in dry bones belongs to that of piezoelectrictiy.更多还原