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creep rate

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Published: 01 June 2019
Fig. 8 Creep rate of Incoloy 800H as a function of stress at a temperature of 800°C. Data for power-law creep are taken from manufacturers (Inco, Sandvik) and from free literature. These data are put into a Larson-Miller equation by regression analysis. Data for diffusional creep are taken More
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Published: 01 June 2019
Fig. 9 Creep rate as a function of stress 6 . More
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Published: 30 August 2021
Fig. 4 Rupture time versus minimum creep rate for service-exposed 9Cr-1Mo steel heater tubes of different vintage and operating conditions More
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Published: 01 June 2019
Fig. 7 Results of the accelerated creep testing. The secondary strain rate is plotted as a function of temperature. More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001738
EISBN: 978-1-62708-220-4
... location. This could not be explained by the creep rate data. It was concluded that external stresses such as bending of the manifold caused this accelerated diametrical expansion. But finite element calculations 2 showed that external stresses could not occur if the spring hangers of the furnace were...
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Published: 01 January 2002
Fig. 3 Stages of creep deformation. (a) Strain curve for the three stages of creep under constant-load testing (curve A) and constant-stress testing (curve B). (b) Relationship of strain rate, or creep rate, and time during a constant-load creep test. The minimum creep rate is attained during More
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Published: 15 January 2021
Fig. 3 Stages of creep deformation. (a) Strain curve for the three stages of creep under constant-load testing (curve A) and constant-stress testing (curve B). (b) Relationship of strain rate, or creep rate, and time during a constant-load creep test. The minimum creep rate is attained during More
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003545
EISBN: 978-1-62708-180-1
... in the component. In these cases, most of the life of the component is spent in crack growth. This involves assessment of fracture resistance rather than a strength assessment based on bulk creep rates and time to stress rupture. Therefore, creep life assessment may involve evaluation of both creep strength (i.e...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001581
EISBN: 978-1-62708-235-8
...) for 150 h with a stress of 69 MPa (10 ksi). The same three heat treatment conditions tested at room temperature were tested for creep strength. Three tests were made for each condition. The average result for each set of three tests, shown in Table 5 , demonstrates the high creep rates in the samples...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006780
EISBN: 978-1-62708-295-2
..., most of the life of the component is spent in crack growth. This involves assessment of fracture resistance rather than a strength assessment based on bulk creep rates and time to stress rupture. Therefore, creep life assessment can involve evaluation of both creep strength (i.e., creep rate, stress...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006807
EISBN: 978-1-62708-329-4
... regime may be considered to have reached its end of life when: Rupture occurs. The deformation becomes excessive. Latent flaws or initiated cracks grow at unacceptable rates by creep or creep/fatigue. Creep Curve Ever since creep was recognized as a concern in the design of high...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001758
EISBN: 978-1-62708-241-9
... I, II, and III. In the initial Stage I region, there is instantaneous recoverable elastic strain upon application of the load, followed by a period of decreasing creep rate as a function of time. Eventually the creep rate reaches a minimum becoming nearly constant signifying the start of the Stage...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006934
EISBN: 978-1-62708-395-9
... superposition principle (TSSP) time-temperature superposition principle (TTSP) yielding CREEP, STRESS RELAXATION, and the effect of strain rate on yielding are related phenomena that are generally much more significant to polymers at room temperature than they are to metals. Two additional influences...
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Published: 01 January 2002
Fig. 39 (a) Comparison of creep-fatigue crack growth rates with fatigue crack growth plotted as a function of Δ K . (b) The effect of hold time estimated for engineering structures when the creep crack growth rate is plotted as a function of ( C t ) avg More
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003517
EISBN: 978-1-62708-180-1
... creep. Metal degradation and permanent deformation occur with time, depending on the actual temperature and stress levels. If temperatures and stresses exceed design-selection values, the component exhibits a higher creep rate and fails earlier than expected. High-temperature-creep failures sometimes...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003550
EISBN: 978-1-62708-180-1
... reduces both tensile strength and stiffness of the affected plastic and also accelerates the creep rate of the material if it is under stress. If an application of a particular plastic requires a certain minimum level of strength or stiffness, unintentional plasticization by exposure to a chemical...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006867
EISBN: 978-1-62708-395-9
... which medical tubing is made through the judicious use of plasticizers ( Ref 6 ). However, the plasticization effect reduces both tensile strength and stiffness of the affected plastic and also accelerates the creep rate of the material if it is under stress. If an application of a particular plastic...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001004
EISBN: 978-1-62708-229-7
...) fracture, viz., in low temperature RTE fracture, initiation and propagation of microcracks are rate controlling while at high temperatures the nucleation and growth of creep cavitation, dislocation mobility and grain boundary sliding are important. Wilkinson et al ( 6 ) observed that the ductility of P...
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Published: 30 August 2021
Fig. 1 Schematic illustrations of creep curves. (a) Strain versus time. (b) Creep strain rate versus time More
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006781
EISBN: 978-1-62708-295-2
... energy input into the material system. As an example, compressive hydrostatic stresses may decrease the rate of dislocation movement, and elevated temperatures may increase the rate of dislocation movement. This last example is not to be confused with the time-dependent damage mechanism of creep...