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fatigue fraction

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060173
EISBN: 978-1-62708-343-0
..., strain-range partitioning (SRP), several variants of the frequency-modified life equation, a hysteresis energy function, several variants of time- and cycle-fraction damage accumulation, methods based on crack- and void-growth considerations, damage mechanics, and a thermomechanical fatigue, oxidation...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060043
EISBN: 978-1-62708-343-0
... such damage rules and discusses their applicability in different situations. creep-fatigue test fatigue life hysteresis loops interaction damage rule life fraction rule microstructural damage strain-range partitioning STRAIN-RANGE PARTITIONING (SRP) is a unique and powerful method...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.tb.msisep.t59220519
EISBN: 978-1-62708-259-4
... are above “merchant bar” quality, but they can cover a wide range of “quality” steel. Just specifying a steel grade and final hardness (directly related to the quenched and tempered (Q&T) properties) leaves the part performance undefined. Fatigue resistance and resistance to hydrogen embrittlement...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.fdsm.t69870123
EISBN: 978-1-62708-344-7
... at high operating temperatures) ( Ref 6.11 ) uses a summation that varies from 1.0 down to 0.4 for creep-fatigue interaction, depending on the proportion of each type of fractional damage present. The 0.4 limit corresponds to 0.2 fatigue and 0.2 creep damage fractions for austenitic stainless steels...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610209
EISBN: 978-1-62708-303-4
... alpha phase. The exact nucleation site depends on cooling rate, volume fraction, and size of the primary alpha phase. An example of crack nucleation within the lamellar regions is shown in Fig. 45(c) . Fig. 45 Fatigue crack nucleation sites in Ti-6Al-4V. (a) Fully lamellar microstructure. (b...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.aceg.t68410021
EISBN: 978-1-62708-280-8
.... , and Larsson l.E. , “ Microstructural Effects on Fatigue Properties of a Cast Al7SiMg Alloys ,” SAE Technical Paper 840121, 1984 , 10.4271/840121 2. Boileau J. M. , Zindel J.W. , and Allison J.E. , “ Effect of Solidification Time on the Mechanical Properties in a Cast A 356–T6...
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
... to cyclic operation. The effect of prior creep on subsequent creep-fatigue damage is therefore of great interest. Miller and Gladwin ( Ref 39 ) investigated the creep-fatigue behavior of samples which had been previously tested in creep to life fractions of 0.2 and 0.6. Their results ( Fig. 4.17 ) show...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1989
DOI: 10.31399/asm.tb.dmlahtc.t60490265
EISBN: 978-1-62708-340-9
... can be used, whereas in other cases a complex finite-element analysis may be required. The Schlottner and Seeley method provides a unique way of estimating damage based on time life fractions using a strain-exhaustion criterion. LCF Life Expenditure in Pure Fatigue For pure-fatigue conditions...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.tb.ahsssta.t53700095
EISBN: 978-1-62708-279-2
... . A schematic of the microstructure of DP steel is shown in Fig. 5.2 . Dual-phase steels derive their strength from the martensite phase and their ductility from the ferrite phase. The volume fraction of martensite determines the strength level of this steel. Fig. 5.1 Microstructure of DP 600 showing...
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 December 1989
DOI: 10.31399/asm.tb.dmlahtc.t60490183
EISBN: 978-1-62708-340-9
... and remedies, have been surveyed and documented in a manual ( Ref 1 ). The major failure categories noted in this survey are listed in Table 5.3 . Of these mechanisms, only stress-rupture, fire-side corrosion, and thermal fatigue are specifically related to the high-temperature environment. Because...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060231
EISBN: 978-1-62708-343-0
... for the remaining uninspected disks. This calibration of the fatigue design curve permitted a direct and, hopefully, accurate assessment of the fractional life (damage) remaining in turbopump disks that had already seen various amounts of service. Thus, judgments could be made as to which disks in the fleet...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1989
DOI: 10.31399/asm.tb.dmlahtc.9781627083409
EISBN: 978-1-62708-340-9
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1989
DOI: 10.31399/asm.tb.dmlahtc.t60490415
EISBN: 978-1-62708-340-9
... environmental damage mechanism. (3) Industrial turbines are designed for less-severe cyclic operation, and hence creep is more of a concern than fatigue. (4) Components of industrial turbines are much larger, and hence technological innovations are often constrained by processing limitations...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.fdsm.t69870325
EISBN: 978-1-62708-344-7
...) and 0.62 (tensile fatigue). Fig. 12.34 Compressive loading curves at various life fractions for specimen CH. Source: Ref 12.9 Fig. 12.35 Secant modulus degradation with applied cycles during compressive loading only for specimen CH. Source: Ref 12.9 Fig. 12.36 Integrated...
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 December 1989
DOI: 10.31399/asm.tb.dmlahtc.t60490001
EISBN: 978-1-62708-340-9
... are often employed to determine the expended lives of components under creep, fatigue, and creep-fatigue conditions. From plant records, information on temperature and cycling history is gathered. By use of standard material properties and damage rules, the fractional life expended up to a given point...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.tb.ahsssta.t53700115
EISBN: 978-1-62708-279-2
... are used mainly to stabilize the austenite phase at room temperature, while titanium, nickel, and vanadium are added to improve the strength of the steel. Transformation-induced plasticity steels consist of two phases: a ferrite/bainite matrix and a 5 to 20% volume fraction of metastable retained austenite...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870537
EISBN: 978-1-62708-314-0
... 13 15.3 16 Fatigue limit, 10 6 cycles, ksi 75 40 … Fracture toughness, ksi · in. 1/2 50 40 29 Hardness (HRC) 34 40 44 HRC,; RT, room temperature. Source: Ref 2 Commercial GLARE grades Table 20.5 Commercial GLARE grades Glare grade Sub grade Material sheet...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430409
EISBN: 978-1-62708-253-2
...Data on damage classification and expended life fraction of creep damage for boiler components Table 8.1 Data on damage classification and expended life fraction of creep damage for boiler components Stage of damage Microstructure Expended life fraction Stage 1 (service rendered...