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time-dependent crack growth

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540281
EISBN: 978-1-62708-309-6
... Abstract Large-scale yielding at the crack tip and time-dependent crack growth mechanisms, such as stress relaxation due to creep, are nonlinear behaviors requiring nonlinear analysis methods. This chapter presents two such methods, one based on elastic-plastic fracture mechanics, the other...
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
...    Hardness monitoring Quantitative relationships with remaining life are lacking Oxide scale measurements for tubes Need data on oxide scale growth in steam Kinetics of hot-corrosion and constant-damage curves Fig. 3.31. Monkman-Grant-type correlation between time to failure and creep-crack...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540215
EISBN: 978-1-62708-309-6
... are approximately the same. Thus, crack growth rates at each point along the crack boundary are approximately the same. Therefore, whether the crack starts as a scratch (having a ≪ c ) or a deep cavity (having c ≪ a ), given time its flaw shape will eventually stabilize at a/c ≌ 0.8. Fig. 5.20...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030126
EISBN: 978-1-62708-282-2
... < K crit ). Precorrosion followed by loading in an inert environment will not result in any observable crack propagation, while simultaneous environmental exposure and application of stress will cause time-dependent subcritical crack propagation. The term synergy was used to describe this process...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2017
DOI: 10.31399/asm.tb.sccmpe2.t55090001
EISBN: 978-1-62708-266-2
... environment will not result in any significant crack propagation, while simultaneous environmental exposure and application of stress will cause time-dependent subcritical crack propagation. The term synergy is used to describe this process because the combined simultaneous interaction of mechanical...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610303
EISBN: 978-1-62708-303-4
... must be determined from the crack growth time calculated in the damage tolerance analysis. Inspections can be performed by means of any nondestructive inspection technique, but destructive techniques such as proof testing are essentially inspections. If a burst occurs during hydrostatic testing...
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
... 186 ). Fig. 4.56. Variation of steady-state crack growth (over 2.5 to 7.5 mm, or 0.1 to 0.3 in.) in several alloys with maximum temperature in thermal shock ( Ref 201 ). Fig. 4.58. Comparison of observed and predicted influence of hold time on crack growth per cycle at selected ΔK...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 1997
DOI: 10.31399/asm.tb.wip.t65930163
EISBN: 978-1-62708-359-1
... mechanics-based fatigue crack growth procedures, the user can determine the number of cycles (or time) needed for the crack to extend from the initial size to the critical size. The time for the crack to extend from its initial size to the critical size represents the maximum inspection interval...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2017
DOI: 10.31399/asm.tb.sccmpe2.t55090341
EISBN: 978-1-62708-266-2
... produce immediate failure. It describes crack growth mechanisms, explains how to measure crack growth rates and predict time to failure, and provides crack growth data for a number of materials and environments. ceramics environmentally enhanced crack growth glass stress-corrosion cracking...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.t65940271
EISBN: 978-1-62708-302-7
.... If cooled too slowly or reheated to lower temperatures following quenching, one or more phases precipitate from the solid solution, and local changes in composition associated with this precipitation may make the alloy susceptible to localized corrosion. Depending on the alloy, the time required...
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
...-intensity factors (Δ K ). Despite the fact that plastics are time-dependent materials, and that linear fracture mechanics only apply strictly to elastic materials, it appears that crack-propagation rates in many polymers can be correlated with Δ K . During the fatigue process, the stress amplitude (Δσ...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030148
EISBN: 978-1-62708-282-2
... of hydrogen and a delayed time to failure (incubation time), during which hydrogen diffuses into regions of high triaxial stress. Hydrogen stress cracking may promote one mode of fracture in an alloy rather than another form normally observed in benign environments. Thus, all modes of cracking have been...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 1997
DOI: 10.31399/asm.tb.wip.t65930003
EISBN: 978-1-62708-359-1
... (111) planes symmetrically located around the <001> axes require the greatest time to solidify and, therefore, serve both to drag and guide the growth of solidifying grains. Fig. 5 Comparison of weld pool shapes. Travel speeds: (a) slow, (b) intermediate, (c) fast The shape...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610501
EISBN: 978-1-62708-303-4
... Mg ++ + 2 e - → Mg –2.363 Na + + e - → Na –2.714 K + + e - → K –2.924 Source: Ref 3 Forms of Corrosion There are many different types of corrosion, and more than one corrosion mechanism may be operating at the same time. Some types of corrosion depend only...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060173
EISBN: 978-1-62708-343-0
... component design 8.86 ABD ITC Interactive time-cycle fractions 8.78 ABD RCF Relaxation creep fatigue 8.87 D MSE Modified strain-range equation 8.103 D TDE Time-dependent exponent of strain 8.32 ABDE PFC Phenomenological fatigue creep 8.89 DF OCF Overstress...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1989
DOI: 10.31399/asm.tb.dmlahtc.t60490265
EISBN: 978-1-62708-340-9
.... , “ Development of a Crack Growth Algorithm for Time Dependent Analysis of Steam Turbine Rotors, ” Report NP 3187, Electric Power Research Institute , Palo Alto, CA , July 1983 70. Saxena A. , Shih T.T. , and Earnst H.A. , Wide Range Creep Crack Growth Behavior of A470 Class 8 (CrMoV...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540297
EISBN: 978-1-62708-309-6
... assisted crack growth under sustained tensile loading. That means da/dN and da/dt are interchangeable (after converting the time-based da/dt to the cycle-based da/dN , and vice versa). Many curve-fitting equations were developed to fit the da/dt data and used for converting to da/dN . Conclusive...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.9781627083027
EISBN: 978-1-62708-302-7
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780404
EISBN: 978-1-62708-281-5
..., in which more craze fibrils undergo extensive plastic deformation until they rupture. At the same time, craze growth continues, and new craze matter is generated at the craze tip. When the crack reaches a certain critical size, crack extension occurs in an uncontrollable manner, resulting in an unstable...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2013
DOI: 10.31399/asm.tb.uhcf3.t53630257
EISBN: 978-1-62708-270-9
... approach is used where the rate of crack growth, labeled da/dN , is measured as a function of the K range during loading, Δ K . Fracture mechanics can be used to aid in the design and predict service life of pressure vessels and other engineering structures in which subcritical flaw growth or time...