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constant-load creep curves

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060001
EISBN: 978-1-62708-343-0
... of creep 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...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610415
EISBN: 978-1-62708-303-4
... stand used for creep and stress-rupture testing. Source: Ref 2 Fig. 2 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...
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
..., the cross-sectional area decreases, so the applied stress increases with time. Constant load creep curves typically, but not always, consist of three distinct stages, as shown in Fig. 15.2 . Fig. 15.1 Typical creep test fixture Fig. 15.2 Typical creep curve Primary Creep Secondary...
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
... properties are generally determined by means of a test in which a constant uniaxial load or stress is applied to the specimen and the resulting strain is recorded as a function of time. Typical shapes of creep curves are shown in Fig. 3.1 . After the instantaneous strain, ∊ 0 , a decelerating strain-rate...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060049
EISBN: 978-1-62708-261-7
... steel, do not have a gradual transition from elastic to plastic behavior. Instead, the yield point fluctuates about some approximately constant value of load, and then rises with further strain ( Fig. 3.10 ). The load at which the sudden drop occurs is called the upper yield point . The constant load...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780185
EISBN: 978-1-62708-281-5
... uniaxial tensile creep behavior of plastics under constant load, isothermal temperature, and a given environment can be illustrated as ductile creep behavior ( Fig. 7a ) or as brittle creep behavior ( Fig. 7b ). At very low stress levels, both types of plastics exhibit similar first-stage and second-stage...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540047
EISBN: 978-1-62708-309-6
...) . Actually, the strain in the uniformly extended regions outside the neck remains constant (at a value that corresponds to the maximum load). There is another good reason for using the natural strain instead of the conventional strain. Incompatibility exists between conventional strains in tension...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060083
EISBN: 978-1-62708-343-0
... to determine the constants in creep equations such as that of Norton ( Ref 1.52 ) and Bailey ( Ref 1.53 ). Other models (such as those listed in Chapter 1, “Creep Under Monotonic and Cyclic Loading” ) are also available. The drawback is that most such models are based on uniaxial monotonic creep tests...
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 December 2003
DOI: 10.31399/asm.tb.cfap.t69780199
EISBN: 978-1-62708-281-5
... occurs under constant stress or load, stress relaxation occurs under constant strain or displacement and may be viewed as creep under a constantly decreasing stress. A simple model for the relationship between creep and stress relaxation is presented. In stress relaxation, a specimen is generally...
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
... its full theoretical effect, q = 1. The notch-sensitivity index is not a true material constant but varies with the severity and type of notch, specimen size, and type of loading. It increases with section size and tensile strength. Fatigue under Combined Stresses Components are subjected...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060111
EISBN: 978-1-62708-343-0
... involves only rapid loading, the creep is negligible; only the tensile half involves creep. Step (a) shows the creep rates and the integrated area (representing the total creep strain) as 0.000975 for the 60 min tensile hold period. In step (b), it is also shown that the plastic strain range is 0.0160...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060173
EISBN: 978-1-62708-343-0
... test should be used. The creep-rupture ductility should be chosen for approximately the same time required of the computed cyclic loading. Trial-and-error calculations are involved, since the computed life (and thus the required rupture time) is initially unknown. In this way, life estimates can...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1995
DOI: 10.31399/asm.tb.sch6.t68200083
EISBN: 978-1-62708-354-6
... extension of 0.2%. As the strain is increased beyond the yield point, the material strain-hardens and the stress must be increased to continue the deformation. As the tensile specimen elongates, its cross-sectional area decreases to maintain an essentially constant volume. At the maximum load point...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780055
EISBN: 978-1-62708-281-5
... ^ for the time of loading and ambient temperature. Fig. 8 Deformation map (a) used to predict PC part deformation at 82 °C (180 °F). Ê = E ( T , t )/2350 MPa. (b) Comparison of cathode-ray-tube housing creep prediction When a constant displacement is applied to a part, the calculated linear...
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
..., and time in order to determine multiheat constants that are then used to fit multiheat data from other materials and thus estimate rupture times. creep-rupture failure multiheat constants time to failure time-temperature parameters CREEP RUPTURE is essentially the end point of a creep test...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.9781627083096
EISBN: 978-1-62708-309-6
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060043
EISBN: 978-1-62708-343-0
...Abstract Abstract Strain-range partitioning is a method for assessing the effects of creep fatigue based on inelastic strain paths or strain reversals. The first part of the chapter defines four distinct strain paths that can be used to model any cyclic loading pattern and describes...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1989
DOI: 10.31399/asm.tb.dmlahtc.t60490183
EISBN: 978-1-62708-340-9
... damage to dissimilar-metal welds arising from steady-state loads and cyclic loads. The loading history is defined in terms of time; weld-metal temperature; changes in weld-metal temperature; number and types of cycles, and axial stresses at the weld due to pressure, dead weight, and restrained thermal...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.bcp.t52230209
EISBN: 978-1-62708-298-3
... in Table 17.8 . The effect of BeO content and loading rate were also reported, and the results are shown in Table 17.9 . Unfortunately, the authors did not attempt to vary independently one of the variables (grain size or BeO content) while maintaining the other constant [ Naik and Singhal 1991 ]. It must...