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fatigue crack growth rates

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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
... F 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...
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.marine.c9001657
EISBN: 978-1-62708-227-3
... initiation had taken 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...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001594
EISBN: 978-1-62708-229-7
... are needed to determine fatigue crack growth. Specific characteristics of the vibration (bending, pressure pulsation, etc.) also influence the stress intensity at the crack tip and the growth rate. Mechanical vibrations can be controlled by reducing the vibration energy ( i.e. balance rotating...
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
... plane (shear mode). Propagation on a slant plane can occur in relatively thin, tough materials at high growth rates. Source: Ref 14 Fig. 13 Aluminum alloy fracture mechanics test specimen, 6.3 mm (0.25 in.) thick. Fatigue crack at left of arrows is flat and perpendicular to side surfaces...
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
... of transition from flat (tensile mode) fatigue crack propagation to growth on a slant plane (shear mode). Propagation on a slant plane can occur in relatively thin, tough materials at high growth rates. Source: Ref 14 Fig. 13 Aluminum alloy fracture mechanics test specimen, 6.3 mm (0.25 in.) thick...
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
... . 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, the fatigue crack growth curves...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006774
EISBN: 978-1-62708-295-2
...-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) Transverse-longitudinal orientation; Δ K = 24.3 to 25.5 M P a m (22.1 to 23.2 ksi in .); and da / dN = 9.4...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001111
EISBN: 978-1-62708-214-3
... a serious problem with as few as 100,000 cycles of truck traffic ( Fig. 18 and Table 2 ). 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...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003546
EISBN: 978-1-62708-180-1
...: Ref 13 Fig. 9 Results of elastic-plastic analysis showing the hoop stress range distribution along several directions on plane A. Source: Ref 13 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...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006781
EISBN: 978-1-62708-295-2
... ) as a function of crack size for crack types A, B, and C. Δ K thermal , cyclic stress intensity due to thermal stresses; Δ K p , cyclic stress intensity due to pressure stresses 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...
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
.... The approach offered a means of quantification of fracture features, providing for objective fractography. Digital Fractography Digital image analysis Helicopters Rotor blades Rotor blade metal Fatigue fracture Introduction Materials Analysis Crack Growth Rate Analysis Conclusions...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001291
EISBN: 978-1-62708-215-0
... the cracking in the chromium. The intergranular cracking was characteristic of hydrogen embrittlement cracking, which probably would have occurred before the strut was baked (de-embrittlement) to remove residual hydrogen. Although it was not possible to establish the fatigue crack growth rate from...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001136
EISBN: 978-1-62708-229-7
... shroud plate material were machined and used for both fatigue crack propagation rate tests as well as fracture toughness tests, in accordance with ASTM E647-78T and BS.5447 (and BS.5762) respectively. A plot of, the rate of crack growth per cycle, da/dN against cyclic stress intensity amplitude, ΔK...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006779
EISBN: 978-1-62708-295-2
... at inclusions beneath the surface, such as carbides, oxides, and sulfides. The initial crack-growth rate in the so-called very-high-cycle fatigue range is extremely low, for example, da / dN = 10 −8 mm/cycle = 4* 10 −10 in/cycle. Assessing Fatigue S-N Properties Given the extensive history...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003537
EISBN: 978-1-62708-180-1
... also describes the general features of fatigue fractures in terms of crack initiation and fatigue crack propagation. brittle fracture crack initiation creep fracture deformation ductile fracture failure analysis fatigue crack growth fatigue crack propagation fatigue fracture fractography...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.rail.c9001531
EISBN: 978-1-62708-231-0
.... The ductility (elongation), impact toughness ( a k ), and fracture toughness ( K IC , actually K Q ) increase, while the strength (yield strength, σ 0.2 , and tensile strength) decreases as the carbon content decreases. However, the fatigue crack growth rates in the Paris regime and fatigue thresholds...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.9781627081801
EISBN: 978-1-62708-180-1
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.petrol.c9001137
EISBN: 978-1-62708-228-0
... fatigue crack propagation data determined earlier in the laboratory, it is possible to read off the value of δK (and hence δσ) corresponding to particular fatigue crack growth rates (da/dN). This follows since, in the linear portion of the fatigue crack propagation curve at least, it is normally...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003517
EISBN: 978-1-62708-180-1
..., the temperature to which it is subject, and the duration of peak load. The variation of the fatigue crack growth as a function of temperature is shown in Fig. 3 . For a more detailed description of this effect, see Ref 5 . Fig. 3 Variation of the fatigue crack growth rate as a function of temperature...