FUNDAMENTAL STUDY OF CREEP-RUPTURE UNDER COMBINED STRESS
An investigation of the fundamental concepts of combined stress creep- rupture was performed. Uniaxial and biaxial creep-rupture tests were conducted on a single heat of AMS-5648, type-316 stainless steel, at 1350, 1500, and 1650 deg F. Creep-rupture data obtained on uniaxial tensile specimens and capped end, thin wall tube specimens substantiate the Scderberg criterion for creep rate, and show that the creep strengths correlate on an effective stressminimum effective creep rate basis rather than on a maximum stress basis. Rupture strengths of the tubes are best compared on an effective stress with the time to the beginning of uniaxial tertiary creep. The effective strain at beginning of tertiary creep for the uniaxial tests correlates better with the effective strain at rupture for the biaxial tests than does the effective rupture strain in the necked down section of the uniaxial tests. Gcod agreement is observed for rupture time on the maximum stress basis. Within the limits of material scatter and at the temperatures tested, this heat of material exhibited isotropic creep-rupture properties. (auth)
- Research Organization:
- Pratt and Whitney Aircraft Div., United Aricraft Corp. Connecticut Aircraft Nuclear Engine Lab., Middletown
- DOE Contract Number:
- AT(11-1)-229
- NSA Number:
- NSA-15-032548
- OSTI ID:
- 4834863
- Report Number(s):
- PWAC-354
- Country of Publication:
- United States
- Language:
- English
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