The static fatigue technique is the simplest effective test of loss of load bearing capacity with use. Good correlation between results of the static technique and in-use tests on poly ether slab mattresses and molded topper pads demonstrates that in-use performance can be predicted by its use.
The mechanism of fatigue appears to in volve hydrogen bond rearrangement under stress with a return to the original alignment upon removal of the stress. The objective of minimizing realignment, and thereby mini mizing fatigue, may be accomplished by re ducing water content in the foam formulation and increasing the isocyanate index.
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References
1.
R.G. Arnold and D.M. Simons, U.S. Patent2,902,474 to Du Pont.
2.
D.M. Simons and J.J. Verbanc, J. Poly. Sci . 44, 303 (1960)
P.F. Bertsch, Contribution No. 179 from Elastomer Chemicals Department of E. I. du Pont de Nemours & Co. presented at the 139th National Meeting of the American Chemical Society, Division of Organic Coatings and Plastics Chemistry, St. Louis, Missouri, March, 1961.
