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fatigue crack growth rates

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Published: 01 January 2002
Fig. 39 (a) Comparison of creep-fatigue crack growth rates with fatigue crack growth plotted as a function of Δ K . (b) The effect of hold time estimated for engineering structures when the creep crack growth rate is plotted as a function of ( C t ) avg More
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Published: 01 June 2019
Fig. 8 Fatigue crack growth rates through the segregated region compared to known growth rate values. More
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Published: 01 January 2002
Fig. 3 Variation of the fatigue crack growth rate as a function of temperature. (a) Temperature effect on fatigue crack threshold and growth rates. (b) Variation of fatigue crack growth rates at Δ K of 30 MPa m (27 ksi in. ) More
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Published: 01 January 2002
Fig. 6 Schematic illustration of variation of fatigue-crack-growth rate, da / dN , with alternating stress intensity, Δ K , in steels, showing regions of primary crack-growth mechanisms. Source: Ref 5 More
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Published: 01 January 2002
Fig. 13 Effect of hold time on the fatigue crack growth rate properties of 2.25Cr-1Mo cast steel. The 2 h hold time tests were performed in steam at 538 °C (100 °F). Source: Ref 13 More
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Published: 15 January 2021
Fig. 12 Schematic illustration of variation of fatigue crack-growth rate, da / dN , with alternating stress intensity, Δ K , in steels, showing regions of primary crack-growth mechanisms. Source: Ref 13 More
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Published: 15 January 2021
Fig. 17 Effect of hold time on the fatigue crack growth rate properties of 2.25Cr-1Mo cast steel. The 2 h hold time tests were performed in steam at 538 °C (1000 °F). Source: Ref 28 More
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Published: 01 December 1992
Fig. 18 Log-log da/dN versus delta K fatigue crack growth-rate test results for 310 MPa (45 ksi) maximum stress and stress ratio of 0.73. The scatterband (two parallel lines) is for quenched and tempered martensitic steels from NCHRP 12–14. Note that the A517 grade, F, plate D, test results More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001135
EISBN: 978-1-62708-219-8
... higher than specified by the ASTM standards. The fatigue crack growth rate through this area was much faster than expected. All of these property changes resulted from increased carbon levels, higher yield strength, and larger than normal grain size. Bridges (structural) Grain size Segregation...
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Published: 01 January 2002
Fig. 9 Fractographic evaluation of multiple-site fatigue damage in a lower wing skin. The evaluation determined that the damage was caused by abusive machining marks that accelerated the fatigue crack growth rate. (a) Location of cracks in the a lower wing skin pocket. (b) Machine marks More
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Published: 30 August 2021
Fig. 9 Fractographic evaluation of multiple-site fatigue damage in a lower wing skin. The evaluation determined that the damage was caused by abusive machining marks that had accelerated the fatigue crack growth rate. (a) Location of cracks in the lower wing skin pocket. (b) Machine marks More
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003539
EISBN: 978-1-62708-180-1
... in fatigue is macroscopically flat. This region is generally transverse to the direction of cyclic or fluctuating tensile stress that caused fatigue. However, at high loads/high fatigue crack growth rates in relatively thin components made of relatively tough material, a transition to propagation on a slant...
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Published: 15 January 2021
between two grains. da / dN , fatigue crack growth rate. (c) Cleavage striations superimposed on rivers during cyclic crack growth. Source: Ref 29 More
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006776
EISBN: 978-1-62708-295-2
... that caused fatigue. However, at high loads/high fatigue crack growth rates in relatively thin components made of relatively tough material, a transition to propagation on a slant plane can occur ( Fig. 12 ). Macroscopically, fatigue fracture ordinarily has a brittle appearance and lacks the gross plastic...
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Published: 15 January 2021
Fig. 53 Fatigue striations in a vanadium high-strength, low-alloy steel. (a) Longitudinal-transverse orientation; stress-intensity range (Δ K ) = 32.3 to 34.3 M P a m (29.4 to 31.2 ksi in .); and fatigue crack growth rate ( da / dN ) = 3.3 to 3.8 × 10 −5 cm/cycle. (b More
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Published: 15 January 2021
Fig. 47 Scanning electron micrographs of the fracture surfaces of Inconel 718 specimens tested at room temperature. (a) Stress-intensity range (Δ K ) = 30 M P a m (27 ksi in .); striation spacing = ∼0.2 μm; and fatigue crack growth rate ( da / dN ) = ~0.1 μm/cycle. Arrow More
Book Chapter

Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003544
EISBN: 978-1-62708-180-1
... these topics in more detail. Fatigue Crack Growth Rates The limitation of the S - N and ε- N methods is the inability of the controlling quantities to make sense of the presence of a crack. In traditional stress analysis of applied loads, basic elasticity calculations show that both stress and strain...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001144
EISBN: 978-1-62708-217-4
... is useful for analysing crack growth rates, the presence of random loading makes the process much more difficult ( 1 , 2 , 3 ). Fig. 3 Fatigue striations from random loading on fracture surface of failed spar. (638× approx.). The fatigue crack progressed approximately 5.6 mm in a uniform mode...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.marine.c9001657
EISBN: 978-1-62708-227-3
... place in the blade trailing edge. An estimate of the crack-growth rate for the stage II fatigue fracture region coupled with the metallographic results helped to identify the final mode of the turbine blade failure. A detailed metallographic and fractographic examination of the air-cooled vane revealed...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001081
EISBN: 978-1-62708-214-3
... are presented in Fig. 15 . The spin-pit tests showed that the crack propagation rates remained relatively constant up to a crack length of approximately 10 mm (0.4 in.). A typical fatigue striation pattern observed during spin-pit crack growth is shown in Fig. 16 . Using striation counting methods...