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首页> 外文期刊>Journal of Biomechanics >THE VISCOELASTIC BEHAVIOR OF THE NON-DEGENERATE HUMAN LUMBAR NUCLEUS PULPOSUS IN SHEAR
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THE VISCOELASTIC BEHAVIOR OF THE NON-DEGENERATE HUMAN LUMBAR NUCLEUS PULPOSUS IN SHEAR

机译：非变性人腰核在剪切中的粘弹性行为

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摘要

The viscoelastic behavior of the nucleus pulposus was determined in shear under transient and dynamic conditions and was modeled using a linear viscoelastic model with a variable amplitude relaxation spectrum. During stress-relaxation tests, the shear stress of the nucleus pulposus relaxed nearly to zero indicative of the fluid nature of the tissue. Under dynamic conditions, however, the nucleus pulposus exhibited predominantly 'solid-like' behavior with values for dynamic modulus (G*) ranging from 7 to 20 kPa and loss angle (delta) ranging from 23 to 30 degrees over the range of angular frequencies tested (1-100 rad s(-1)). This frequency-sensitive viscoelastic behavior is likely to be related to the highly polydisperse populations of nucleus pulposus molecular constituents. The stress-relaxation behavior, which was not linear on a semi-log plot (in the range tau(1) much less than t much less than tau(2)), required a variable amplitude relaxation spectrum capable of describing this frequency sensitive behavior. The stress-relaxation behavior was well described by this linear viscoelastic model with variable amplitude relaxation spectrum; however, the dynamic moduli were underpredicted by the model which may be related to non-linearities in the material behavior. (C) 1997 Elsevier Science Ltd. [References: 48]
机译：在瞬态和动态条件下，通过剪切确定髓核的粘弹性行为，并使用具有可变振幅弛豫谱的线性粘弹性模型对其进行建模。在应力松弛测试期间，髓核的剪切应力几乎松弛到零，表明组织的流体性质。但是，在动态条件下，髓核主要表现出“类固体”行为，动态模量（ G * ）的值在7至20 kPa的范围内，损耗角（δ）在23至30度的范围内。测试的角频率（1-100 rad s（-1））。这种对频率敏感的粘弹性行为可能与髓核分子成分的高度多分散群有关。应力松弛行为在半对数图上不是线性的（范围tau（1）远小于t远小于tau（2）），它需要可变的振幅弛豫谱来描述这种频率敏感行为。通过具有可变振幅弛豫谱的线性粘弹性模型可以很好地描述应力松弛行为。然而，该模型对动态模量的预测不足，这可能与材料行为的非线性有关。 （C）1997 Elsevier Science Ltd. [参考：48]

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