Creep Rupture Tests for Design of High-Pressure Steam Equipment

1960 ◽  
Vol 82 (2) ◽  
pp. 453-461 ◽  
Author(s):  
E. A. Davis
Keyword(s):  
High Pressure ◽  
Stainless Steel ◽  
Internal Pressure ◽  
Strain Rate ◽  
Uniaxial Tension ◽  
Effective Strain ◽  
Creep Rupture ◽  
Tension Tests ◽  
Pressure Steam ◽  
Tubular Specimens

Creep rupture tests on tubular specimens of type 316 stainless steel were run at 1200 F and at pressures up to 24,000 psi. The specimens were tested under pure internal pressure and equal biaxial tensions. The results of these tests correlate favorably with those of uniaxial tension tests if a comparison is made on the basis of effective stress and effective strain rate.

Influence of Ductility on Creep Rupture Under Multiaxial Stresses

1962 ◽  
Vol 84 (2) ◽  
pp. 228-232 ◽  
Author(s):  
W. Sawert ◽  
H. R. Voorhees
Keyword(s):  
Shear Stress ◽  
Internal Pressure ◽  
Maximum Principal Stress ◽  
Creep Rupture ◽  
Principal Stresses ◽  
Relative Response ◽  
Combined Stresses ◽  
Thin Walled ◽  
Tubular Specimens ◽  
Stress Invariant

Creep-rupture times at 1200 and 1400 deg F were compared for notched versus unnotched bars and for thin-walled tubes in uniaxial tension versus combined tension and internal pressure to give a 1:1 ratio of longitudinal and transverse principal stresses. Relative response to multiaxial stresses of cast DCM alloy with low ductility was not essentially different from that of Rene´ 41 alloy with higher ductility. Creep rupture times of the tubular specimens under combined stresses correlated better in terms of the shear stress invariant than of maximum principal stress.

Biaxial Cyclic Deformation and Creep-Fatigue Behavior of Materials for Solar Thermal Systems

1982 ◽  
Vol 104 (2) ◽  
pp. 88-95 ◽  
Author(s):  
S. Majumdar
Keyword(s):  
Stainless Steel ◽  
Internal Pressure ◽  
Cyclic Deformation ◽  
Fatigue Behavior ◽  
Axial Stress ◽  
Thermal Systems ◽  
Creep Fatigue ◽  
Incoloy 800 ◽  
The Difference ◽  
Tubular Specimens

Biaxial cyclic deformation and creep-fatigue data for Incoloy 800 and Type 316H stainless steel at elevated temperature are presented. Tubular specimens were subjected to constant internal pressure and strain-controlled axial cycling with and without hold times in tension as well as in compression. The results show that the internal pressure affects diametral ratchetting and axial stress range significantly. However, the effect of a relatively small and steady hoop stress on the cyclic life of the materials is minimal. A 1-min compressive hold per cycle does not seriously reduce the fatigue life of either material; a tensile hold of equal duration causes a significant reduction in life for Type 316H stainless steel, but none for Incoloy 800. Fracture surfaces of specimens made of both materials were studied by scanning electron microscopy to determine the reason for the difference in behavior.

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