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creep strain

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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 March 2006
DOI: 10.31399/asm.tb.fdsm.t69870375
EISBN: 978-1-62708-344-7
...Abstract Abstract This appendix provides supplemental information on the metallurgical aspects of atomic structure, the use of dislocation theory, heat treatment processes and procedures, important engineering materials and strengthening mechanisms, and the nature of elastic, plastic, and creep...
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 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060083
EISBN: 978-1-62708-343-0
... strain-range components. The methods covered include rapid cycling between peak stress extremes, half-cycle rapid loading and unloading, and variations of the incremental step-stress approach. The methods are then compared based on their ability to predict creep-fatigue life. The chapter goes on from...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060111
EISBN: 978-1-62708-343-0
... elastic and inelastic strain into a total strain range. The discussion covers important features, procedures, and correlations as well as the use of models and the steps involved in predicting thermomechanical fatigue (TMF) life. It also includes information on isothermal fatigue, bithermal creep-fatigue...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060155
EISBN: 978-1-62708-343-0
...Abstract Abstract This chapter addresses the question of how to deal with multiaxial stresses and strains when using the strain-range partitioning method to analyze the effects of creep fatigue. It is divided into three sections: a general discussion on the rationale used in formulating rules...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060069
EISBN: 978-1-62708-343-0
...Abstract Abstract This chapter demonstrates the versatility of the strain-range partitioning method and its application to creep-fatigue problems involving complex loading histories. It begins with a derivation showing that it is possible to assess the damage of hysteresis loops combining two...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060173
EISBN: 978-1-62708-343-0
...Abstract Abstract This chapter provides a detailed review of creep-fatigue analysis techniques, including the 10% rule, strain-range partitioning, several variants of the frequency-modified life equation, damage assessment based on tensile hysteresis energy, the OCTF (oxidation, creep...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780199
EISBN: 978-1-62708-281-5
...Abstract Abstract This article describes the general aspects of and practical problems of failure analysis of creep, stress relaxation, and yielding for homogeneous polymers. The effect of temperature and strain rate on the relationship between yield point and elastic modulus and the aging...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540281
EISBN: 978-1-62708-309-6
...., Eq 6.20 ) frequently is also written as: (Eq 6.20a) ε ˙ = ε ˙ 0 ( σ σ 0 ) n For a material that is primarily influenced by second-stage creep, the creep strain rate is: (Eq 6.21) ε ˙ = A ⋅ σ n The steady...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780185
EISBN: 978-1-62708-281-5
... was called retarded elastic strain. Second-stage creep deformation is characterized by a relative constant, low-deformation rate. In the four-parameter model, this was called equilibrium viscous flow. The final or third-stage creep deformation is creep rupture, fracture, or breakage. The generalized...
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...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1989
DOI: 10.31399/asm.tb.dmlahtc.t60490265
EISBN: 978-1-62708-340-9
... repetition of this simple cycle, at least three damage mechanisms can be operative: (1) fatigue due to the repeated cycles imposed by the strain range; (2) creep damage during stress relaxation at high temperature; and (3) creep damage under the steady operating loads. If the load changes are not severe...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540047
EISBN: 978-1-62708-309-6
... with creep and stress rupture, stress corrosion, and hydrogen embrittlement. brittle fracture ductile fracture ductility residual stress stress-strain curve THE THREE TYPES OF IDEAL SUBSTANCES (as discussed in Chapter 1 ) are the Hooke solid, the St. Venant solid, and the Newtonian liquid...
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...
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
... , Mechanical Testing and Evaluation , Vol 8 , ASM Handbook , ASM International , 2000 Two types of elevated-temperature, time-dependent tests are conducted to evaluate metals for long-term elevated-temperature service. In a creep test, the time-dependent strain, or extension, is measured under long...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2012
DOI: 10.31399/asm.tb.lmub.t53550299
EISBN: 978-1-62708-307-2
...-strain fracture toughness ( K Ic ) Creep rupture (b) MPa ksi MPa ksi MPa  m ksi  in . Ti-25Al E 538 78 538 78 0.3 … … … Ti-24Al-11Nb W 787 114 824 119 0.7 … … 44.7 FW 761 110 967 140 4.8 … … … Ti-24Al-14Nb W 831 120 977...
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
... that will help in design as well as in component life prediction under creep-fatigue conditions. Several reviews of this subject are available ( Ref 20 to 27 ). In developing these damage rules, four types of laboratory tests have been utilized: Strain-controlled tests with hold periods at constant...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2001
DOI: 10.31399/asm.tb.aub.t61170337
EISBN: 978-1-62708-297-6
... (a) Yield strength Ultimate tensile strength Elongation, % Plane-strain fracture toughness ( K Ic ) Creep rupture (b) MPa ksi MPa ksi MPa m ksi in . Ti-25Al E 538 78 538 78 0.3 … … … Ti-24Al-11Nb W 787 114 824 119 0.7 … … 44.7 FW 761 110 967...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1995
DOI: 10.31399/asm.tb.sch6.t68200083
EISBN: 978-1-62708-354-6
... decreases as the temperature increases, although strain aging in mild steels leads to a peak in fatigue strength above room temperature. At sufficiently high temperature, on the order of 0.4 of the melting point, creep-fatigue interactions must be considered. Sample Problem As an example of a high...