Mansour Joseph M, Motavalli Mostafa, Bensusan Jay, Li Ming, Margevicius Seunghee, Welter Jean F
Department of Mechanical and Aerospace Engineering, Case Western Reserve University, Cleveland, OH, USA.
Case Center for Multimodal Evaluation of Engineered Cartilage, Case Western Reserve University, Cleveland, OH, USA.
J Mech Behav Biomed Mater. 2020 Oct;110. doi: 10.1016/j.jmbbm.2020.103923. Epub 2020 Jun 19.
We measured speed of sound in bovine articular cartilage as a function of compressive strain. Using techniques we developed, it was possible to apply strain starting from the unstrained, full height of a sample. Our measurements showed that speed of sound was not a monotonic function of strain as reported in earlier investigations. Speed increased with increasing strain over a range of lower strains. It reached a maximum, and then decreased as the strain increased further. These results were corroborated using a model of wave propagation in deformable porous materials. Using this model, we also established conditions under which a maximum in the speed would exist for samples in compression. Our measurements and analysis resolve the conflicting results reported in previous studies.
我们测量了牛关节软骨中声速随压缩应变的变化情况。利用我们开发的技术，可以从样品未受应变的全高开始施加应变。我们的测量结果表明，声速并非如早期研究所报道的那样是应变的单调函数。在较低应变范围内，声速随应变增加而增大。它达到最大值，然后随着应变进一步增加而减小。使用可变形多孔材料中的波传播模型证实了这些结果。利用该模型，我们还确定了压缩样品中声速存在最大值的条件。我们的测量和分析解决了先前研究中报道的相互矛盾的结果。
