Fischer R A, Arms S W, Pope M H, Seligson D
J Biomech. 1986;19(2):119-27. doi: 10.1016/0021-9290(86)90142-9.
To study the effect of strain rate on the acoustic emission amplitude signature of bone, bovine cortical bone was milled into standard tensile specimens which were tested at two different strain rates while being monitored with acoustic emission equipment. It was demonstrated that the amplitude distribution of the acoustic events in bone is dependent on strain rate. Greater numbers of events occurred with the slower strain rate (0.0001 s-1), but these events were of lower amplitude than those emitted during the more rapid strain rate (0.01 s-1). The plot of the cumulative event amplitude distribution followed the power-law model, and the slope of this output, the b-value, represented a signature of the amplitude distribution. The mechanical test results were consistent with the behavior of a viscoelastic multi-phase composite material.
为研究应变率对骨声发射幅度特征的影响，将牛皮质骨研磨成标准拉伸试样，在两种不同应变率下进行测试，同时用声发射设备进行监测。结果表明，骨中声事件的幅度分布取决于应变率。较慢应变率（0.0001 s-1）时发生的事件数量更多，但这些事件的幅度低于较快应变率（0.01 s-1）时发出的事件。累积事件幅度分布曲线遵循幂律模型，该输出的斜率即b值代表幅度分布的一个特征。力学测试结果与粘弹性多相复合材料的行为一致。
