Fatigue behavior of acetal homopolymer
Article first published online: 25 AUG 2004
Copyright © 1985 Society of Plastics Engineers, Inc.
Polymer Engineering & Science
Volume 25, Issue 9, pages 548–552, June 1985
How to Cite
Connolly, R., Gauvin, R. and Chalifoux, J. P. (1985), Fatigue behavior of acetal homopolymer. Polym Eng Sci, 25: 548–552. doi: 10.1002/pen.760250907
- Issue published online: 25 AUG 2004
- Article first published online: 25 AUG 2004
As an engineering thermoplastic acetal homopolymer is often used in the manufacture of parts subjected to fatigue. This article presents the results of flexural fatigue tests on acetal Delrin 550 under different environmental conditions, namely ambient air, forced-air ventilation at ambient temperature, or oil kept at a constant temperature at 40°C. The fatigue tests were performed on specimens cut from extruded sheets at a constant frequency of 30 Hz. Surface temperatures of the test specimens were measured either optically or electrically, depending on the environment. The test results show that both acetal stress and surface temperature of specimen, which are somehow related, vary considerably from one type of environment to another. However, results show that the fatigue life of the specimen is mainly governed by the amplitude of the initial stress and is almost independent of the environment, Another subject examined was the effect of oil on acetal's mechanical properties. It was found that prolonged contact with oil produced slight variations in tensile properties, but no significant effect on fatigue, life.