NEGATIVE POISSON RATIOS AND STRAIN-DEPENDENT MECHANICAL-PROPERTIES IN ARTERIAL PROSTHESES

被引:80
作者
CADDOCK, BD
EVANS, KE
机构
[1] UNIV LIVERPOOL,DEPT MAT SCI & ENGN,LIVERPOOL L69 3BX,MERSEYSIDE,ENGLAND
[2] UNIV EXETER,SCH ENGN,EXETER EX4 4QF,DEVON,ENGLAND
基金
英国工程与自然科学研究理事会;
关键词
VASCULAR PROSTHESIS; NEGATIVE POISSON RATIO; AUXETIC;
D O I
10.1016/0142-9612(95)98908-W
中图分类号
R318 [生物医学工程];
学科分类号
0831 ;
摘要
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 wail 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.
引用
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页码:1109 / 1115
页数:7
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