Accession Number:

ADA285301

Title:

The Effects of Fatigue Loading Frequency on Fatigue Life of HIgh- Strength Pressure Vessel Steels

Descriptive Note:

Final rept.

Corporate Author:

ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY BENET LABS

Personal Author(s):

Report Date:

1994-06-01

Pagination or Media Count:

23.0

Abstract:

Bend specimens of high-strength pressure vessel steel were tested in bending fatigue to failure at 1.5, 15, 30, arid 75 Hz fatigue loading frequencies. In the 1.5 to 15 Hz range, there was no discernible difference in the frequency effect on fatigue life. However, in the 30 to 75 Hz range, there was a definite increase in fatigue life compared to the lower range of frequency. The average increase in fatigue over the stress range was a factor of 10 greater than the life at the lower frequency range. This factor increased at lower stresses decreased at higher stresses, but even at the highest stresses tested, the increase was significant, about 5 to 1. This indicates that the frequency effect is more effective at high-cycle fatigue and diminishes with low-cycle fatigue. A model for fatigue life deterioration caused by superimposition of loads under different frequencies is introduced. Fatigue life, High strength, Pressure vessels, Steel, Frequency

Subject Categories:

  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE