Sanders J E, Daly C H
Rehabilitation Medicine Department, University of Washington, Seattle 98195.
Prosthet Orthot Int. 1994 Apr;18(1):43-8. doi: 10.3109/03093649409164670.
Pelite is a polyethylene closed cell foam commonly used as an interface material in prosthetics. Both normal and vacuum-formed Pelite were tested under compression and under shear loading. For shear testing, the results were not significantly different for normal and vacuum-formed Pelite. For normal Pelite, the slope of the stress-strain curve was 1.17MPa (+/- 0.14) while for vacuum-formed Pelite it was 1.24MPa (+/- 0.22). Compressive results, however, were significantly different. Below 80kPa of applied compression, the slope of the stress-strain curve for normal Pelite was 0.99MPa (+/- 0.11) while for vacuum formed Pelite it was 0.72MPa (+/- 0.12). Between 80kPa and 200kPa of applied compression, the slope of the stress-strain curve for normal Pelite was 0.45MPa (+/- 0.03) while for vacuum formed Pelite it was 0.55MPa (+/- 0.05). Reasons for the differences and their significance to interface mechanics and computer-aided prosthesis design are discussed.
佩利泰是一种聚乙烯闭孔泡沫材料，常用于假肢的界面材料。对普通佩利泰和真空成型佩利泰均进行了压缩和剪切载荷测试。对于剪切测试，普通佩利泰和真空成型佩利泰的结果没有显著差异。对于普通佩利泰，应力 - 应变曲线的斜率为1.17MPa（±0.14），而真空成型佩利泰的斜率为1.24MPa（±0.22）。然而，压缩结果存在显著差异。在施加80kPa压缩以下时，普通佩利泰应力 - 应变曲线的斜率为0.99MPa（±0.11），而真空成型佩利泰为0.72MPa（±0.12）。在施加80kPa至200kPa压缩之间，普通佩利泰应力 - 应变曲线的斜率为0.45MPa（±0.03），而真空成型佩利泰为0.55MPa（±0.05）。文中讨论了这些差异的原因及其对界面力学和计算机辅助假肢设计的意义。
