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Creep (materials)

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Published: 01 December 2018
Fig. 4.2 Creep strength of different materials used as boiler tubes and related applications More
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Published: 01 December 2006
Fig. 7.131 Creep expansion of different hot working materials as a function of the load, temperature, and working time of extrusion tools [ Bra 66 ] More
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Published: 01 December 1989
Fig. 7.31. Creep-crack-growth rates for HAZ materials in l¼Cr-½lMo and 2¼Cr-1Mo steels ( Ref 14 ). More
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Published: 01 October 2011
Fig. 3.12 Isochronous stress-strain curves for specimens of a material creep tested at a given temperature More
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1989
DOI: 10.31399/asm.tb.dmlahtc.t60490059
EISBN: 978-1-62708-340-9
... on component life and performance. crack-growth rates creep fracture creep rate creep testing cumulative damage rupture ductility steel One of the most critical factors determining the integrity of elevated-temperature components is their creep behavior. Due to thermal activation, materials...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060001
EISBN: 978-1-62708-343-0
... strain and strain rate equations, explains how to determine creep constants, and reviews the findings of several studies on cyclic loading. It also discusses the development of a novel test that measures the cyclic creep-rupture resistance of materials in tension and compression. activation energy...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540281
EISBN: 978-1-62708-309-6
.... Elastic-plastic or fully plastic analysis such as the J -integral approach is used when large-scale yielding occurs. For crack growth at high temperature, under constant load, the material near the crack tip may undergo viscoelastic deformation, or creep. The crack-tip stress field, which takes the basic...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060083
EISBN: 978-1-62708-343-0
.... However, if both stress and strain vary simultaneously with time, additional analysis is required to separate, or partition, the inelastic strain into its creep and plasticity components. This is the general condition experienced by materials at critical locations in high-temperature components subjected...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240265
EISBN: 978-1-62708-251-8
... hardening and recovery. Secondary creep often occupies the major portion of the duration of the creep test, and the strain rate in this region for many creep-resistant materials is sufficiently constant to be considered as a steady-state creep rate. For these materials, the minimum creep rate is a steady...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610415
EISBN: 978-1-62708-303-4
... plants and turbine components. Typical materials and application temperatures of some creep-resistant alloys are listed in Table 2 . Often, the main concern is dimensional stability, although prolonged creep will eventually lead to rupture. Approximate temperatures for onset of creep Table 1...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430409
EISBN: 978-1-62708-253-2
..., radiography, magnetic particle inspection, dye penetrant testing, in situ replication and metallography, eddy current testing, fibroscopy, acoustic emission, positive material identification, hardness and microhardness measurement, flattening testing, microstructural evaluation, and accelerated creep tests...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060173
EISBN: 978-1-62708-343-0
... into the range of high temperatures where time-dependent creep deformation may occur. In addition, most materials interact with the environment at temperatures sufficiently high to cause creep. This interaction is both chemical and metallurgical, for example, through surface oxidation and by time-temperature...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1989
DOI: 10.31399/asm.tb.dmlahtc.t60490265
EISBN: 978-1-62708-340-9
..., which usually results from higher steam pressures and temperatures, requires materials with greater creep resistance. Reliability, of course, involves a whole spectrum of material properties required to resist failure. The economically driven need for unit cycling in recent times has also required...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060043
EISBN: 978-1-62708-343-0
... value. Final fracture, for materials subject to grain-boundary sliding, is frequently intercrystalline, and it occurs after relatively few cycles, compared to the other ways of imposing the same strain range. Fig. 3.2 Schematic illustration of creep-fatigue interaction when tensile creep...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430149
EISBN: 978-1-62708-253-2
... deformation of a material at elevated temperature under mechanical stresses of constant magnitude. A failure from such a condition is referred to as a creep or stress rupture failure. Stress rupture failures also cover failure due to short-term or long-term overheating ( Ref 6.1 ). Overheating Failures...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780185
EISBN: 978-1-62708-281-5
... analyses of viscoelastic plastics are briefly described. The discussion covers the most commonly used tests for impact performance, various types of hardness test for plastics, the fatigue strength of viscoelastic materials, and the tension testing of elastomers and fibers. creep testing dynamic...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780199
EISBN: 978-1-62708-281-5
... Eq 13 can be used, assume that the creep curve can be represented by: (Eq 14) ε c = A σ n   e − Q / RT t m where the material constants A , n , Q , and m have all been determined by the appropriate creep experiments. Then: (Eq 15) ε...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1989
DOI: 10.31399/asm.tb.dmlahtc.t60490111
EISBN: 978-1-62708-340-9
..., and frequency) and factors such as temperature, material defects, component geometry, and processing history. It provides a detailed overview of the damage mechanisms associated with high-cycle and low-cycle fatigue as well as thermal fatigue, creep-fatigue, and fatigue-crack growth. It also demonstrates...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2013
DOI: 10.31399/asm.tb.uhcf3.t53630055
EISBN: 978-1-62708-270-9
... that this is only one instance of a general and widespread problem, it may be necessary to redesign the assembly to reduce the stresses and temperatures, or to obtain a material with a higher yield strength at the operating temperature. Creep Somewhat similar to the problem of yielding during service...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060021
EISBN: 978-1-62708-343-0
... a large collection of creep-rupture data corresponding to different alloy designations and heat treatments, identifying key relationships, similarities, and differences. It also presents a test method developed by the authors in which twelve materials are tested over a range of temperature, stress...