๐”– Bobbio Scriptorium
โœฆ   LIBER   โœฆ

Prediction and measurement of fatigue of lifetime distributions for elastomeric biomaterials

โœ Scribed by K. P. Gadkaree; J. L. Kardos

Publisher
John Wiley and Sons
Year
1984
Tongue
English
Weight
698 KB
Volume
29
Category
Article
ISSN
0021-8995

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โœฆ Synopsis

Synthetic polymer biomaterials being considered for cardiovascular applications must perform under conditions of large cyclic deformations for long lifetimes. In designing with these materials and eventually qualifying them clinically, it would be extremely helpful to be able to predict the fatigue lifetimes accurately and reliably. In this article a calculational format is presented which predicts the lifetime distribution function for elastomeric sheets undergoing tension-tension fatigue. From a knowledge of the intrinsic tensile strength distribution and the effect of an "equivalent" edge flaw size on the tensile strength, the inherent flaw size distribution is determined. A tearing energy concept is utilized to determine the flaw growth law constants. Each of these three short-term tests provides a pair of constants which, taken together, permit calculation of the fatigue lifetime distribution. When compared using Kolmogoroff statistics, experimental tensile-tensile fatigue results at 0.01 cps agreed well with the theoretically predicted lifetime distribution function.

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