松质骨的一维撞击动力响应

基于对松质骨结构特征的观察，引入了描述松质骨的两相多孔弹性模型，对松质骨在一维撞击载荷作用下的动力响应进行了深入的分析。研究表明：由于松质骨中流体组分的扩散和流动，松质骨呈现着一种强烈的表观粘弹性行为以及能量耗散性质。

One-dimensional Impact Dynamic Response of Cancellous Bone

In this paper a one dimensional dynamic response of cancellous bone to impact loading is investigated. It is demonstrated, based on the studies with scanning electron microscope, cancellous bone could be viewed as a celluar solid consisting of an interconnected skeleton filled with medulla. A two phase poroelastic model is introduced to describe the cancellous bone, in which the tissue(material) densities of the skeleton and medulla are assumed to be unchangeable while the corresponding apparent densities are changeable due to the change of volume fraction. the governing equations are derived for the case of a linear poroelastic solid skeleton saturated with an inviscid medulla. Under the impact loading, responses of the skeleton displacement and stress as well as the medullary pressure are obtained with the use of Laplace transform technique. The computational result shows that the cancellous bone is provided with certain features similar to those appearing in viscoelastic solids, which means that the responses do not only depend on time, but furthermore depend on previous loading history. It is worth paying attention to the result that the medullary pressure can be negative. This point is due to the recovery of the skeleton after unloading whereas the medulla is not squeezed out but absorbed into the pores by suction.