Stress wave effects in a finite element analysis of an impulsively loaded articular joint.
Stress wave effects in a finite element analysis of an impulsively loaded articular joint.
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DOI：
10.1243/pime_proc_1991_205_258_02
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发表时间：
1991-01-01
期刊：
影响因子：
--
通讯作者：
Radin, E L
中科院分区：
文献类型：
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作者：
Anderson, D D;Brown, T D;Radin, E L
采用动态接触有限元方法研究了兔膝关节的瞬态应力，建立了机械诱导骨关节病实验模型。计算被用来检验假设应力波的传播和反射，从材料性质不连续的关节界面，可能负责瞬态局部软骨应力水平显著增加。有限元结果直观可信地展示了应力波传播和界面反射现象。然而，这些波的大小还不足以明显改变准静态应力分布。因此，来自模量不连续界面（例如软骨/软骨下板）的局部应力波反射可能不会显著促进该动物模型中实验观察到的组织对脉冲载荷的敏感性提高。
A dynamic contact finite element formulation was used to study transient stresses in the impulsively loaded rabbit knee, an established experimental model of mechanically induced osteoarthrosis. The computations were used to test the hypothesis that stress wave propagation and reflection, from juxtarticular interfaces of material property discontinuity, could be responsible for markedly increased levels of transient local cartilage stress. The finite element results demonstrated intuitively credible stress wave propagation and interfacial reflection phenomena. However, the magnitude of these waves was not nearly large enough to appreciably alter the quasi-static stress distributions otherwise prevailing. Thus, local stress wave reflection from interfaces of modulus discontinuity (for example the cartilage/subchondral plate) probably does not contribute appreciably to the heightened tissue sensitivity to impulsive loading experimentally observed in this animal model.