Caddock B D, Evans K E
Department of Materials Science and Engineering, University of Liverpool, UK.
Biomaterials. 1995 Sep;16(14):1109-15. doi: 10.1016/0142-9612(95)98908-w.
The elastic properties of two artificial arterial prostheses have been measured. One is a fibrillar polyurethane (PU) material, the other is an expanded polytetrafluoroethylene (ex-PTFE). It is shown that the conventional assumption of incompressibility is invalid for both materials and that changes in the thickness of the prosthetic artery wall must be measured directly. The ex-PTFE shows highly strain-dependent properties, the most significant being that of large negative through-thickness Poisson ratios, up to -11. These results have important consequences for matching the properties of prostheses to natural materials.
已经测量了两种人工动脉假体的弹性特性。一种是纤维状聚氨酯（PU）材料，另一种是膨体聚四氟乙烯（ex-PTFE）。结果表明，对于这两种材料，传统的不可压缩性假设是无效的，并且必须直接测量假体动脉壁厚度的变化。ex-PTFE显示出高度应变依赖性特性，其中最显著的是高达-11的大的负厚度方向泊松比。这些结果对于使假体特性与天然材料相匹配具有重要意义。
