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fatigue crack growth rate testing

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Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005419
EISBN: 978-1-62708-196-2
... to the growth of a crack in a material. For more depth on this subject, see a fracture mechanics text, for example Ref 5 and 6 , for a more detailed description of Y and the stress-intensity factor. Testing has shown that under controlled constant-amplitude fatigue loading, the crack-growth rate...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001286
EISBN: 978-1-62708-170-2
..., deposition rate, gaseous contamination, and concurrent energetic particle bombardment (flux, particle mass, energy) Details of film growth on the substrate surface —e.g., substrate temperature, nucleation, interface formation, interfacial flaw generation, energy input to the growing film, surface...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003241
EISBN: 978-1-62708-199-3
... Abstract This article reviews the various types of mechanical testing methods, including hardness testing; tension testing; compression testing; dynamic fracture testing; fracture toughness testing; fatigue life testing; fatigue crack growth testing; and creep, stress-rupture, and stress...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003243
EISBN: 978-1-62708-199-3
... further in terms of crack nucleation, crack growth rates, and threshold stress-intensity measurements. In order to determine the susceptibility of alloys to SCC, several types of testing are available. If the objective of testing is to predict the service behavior or to screen alloys for service in...
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
... from tests conducted at elevated temperature described in Ref 29 . The data are presented in Fig. 17 , and the equation relating fatigue crack growth rate to the applied magnitude of Δ K and the hold time, t h , expressed in hours is given by: (Eq 38) da dN = 8.6 × 10 − 10 Δ...
Series: ASM Handbook
Volume: 23
Publisher: ASM International
Published: 01 June 2012
DOI: 10.31399/asm.hb.v23.a0005654
EISBN: 978-1-62708-198-6
... tensile and compressive stresses. Crack propagation tests use a fracture mechanics approach in which the growth of preexisting cracks due to cyclic loading is monitored. A fundamental parameter used to describe a fatigue process in smooth specimens is the stress ratio R , defined as: (Eq 15) R...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005405
EISBN: 978-1-62708-196-2
... that affects retardation of the crack driving force; it is characterized by an explicit dependence of the fatigue crack growth rate on microstructure attributes such as grain size, second-phase particle size and spacing, and so on. It also depends on amplitude of applied stress, since such explicit...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005411
EISBN: 978-1-62708-196-2
... be a contributing factor to enhanced crack growth rate. They therefore concluded that niobium is the primary crack growth rate controlling species in elevated-temperature fatigue of alloy 718. They supported this conclusion by testing a niobium-free Ni-18Cr-18Fe alloy under the same conditions as...
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
.... Compact-tension specimens, 25.4 and 6.25 mm (1 and 0.25 in.) thick, were used for fracture toughness and fatigue crack-growth rate testing. In addition, 12.5 by 50.8 mm (0.5 by 2 in.) center-crack-tension specimens were also machined from the central region of another disk from the same forging for...
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
... 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. Fatigue...
Series: ASM Handbook
Volume: 23
Publisher: ASM International
Published: 01 June 2012
DOI: 10.31399/asm.hb.v23.a0005683
EISBN: 978-1-62708-198-6
... current density determination by Tafel extrapolation, potentiodynamic measurement of the polarization resistance, electrochemical impedance measurement, and potentiostatic deaeration. Tests combining corrosion and mechanical forces, such as fretting corrosion tests, environment-assisted cracking tests...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001299
EISBN: 978-1-62708-170-2
... cracks will continue to extend around the circumference and grow inward until eventual spallation, for the case of a TBC with poor thermal fatigue resistance. In good TBC systems, additional sets of 2000 cycles will show little crack growth, if any, and typically at a lower rate than in the first test...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006792
EISBN: 978-1-62708-295-2
... selection. In general, a harder surface is more resistant to wear, fatigue, and so on. At the same time, compressive residual stresses near the surface of the component will slow crack growth such that any microcracks that form propagate more slowly, thereby increasing the time until failure. Therefore...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.9781627081764
EISBN: 978-1-62708-176-4
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0009013
EISBN: 978-1-62708-185-6
... was selected, conducted, and analyzed. Table 1 Guide to selecting a thermomechanical process test based on problem encountered and process used Process Problem Test Rolling Surface cracks, edge cracking, barreling, center bursts Upset, plane-strain indentation, partial width...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0009011
EISBN: 978-1-62708-185-6
... its flow-stress dependence on processing variables (e.g., strain, strain rate, preheat temperature, and die temperature), its failure behavior, and the phase transformations that characterize the alloy system to which it belongs. Very few mechanical tests are capable of providing information about...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003028
EISBN: 978-1-62708-200-6
... well as the rate of photochemical reactions. This article will present a general overview of aging factors, their effects on plastic materials, and the accelerated test methods that can be used to estimate the reaction of a plastic component during actual use. The...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003025
EISBN: 978-1-62708-200-6
... caused by a combination of viscoelasticity and crack growth. Long-term strength and serviceability of plastics have been studied fairly intensively along two branches, initially designated as static fatigue and dynamic fatigue but now more usually referred to as creep rupture and fatigue. The former...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003057
EISBN: 978-1-62708-200-6
...-optical analysis Microscopy Source: Ref 33 Table 4 Factors influencing thermal analysis Test method Measured variable Factors influencing measurement (a) Dilatometry Size or volume Interference, furnace atmosphere, heating rate, thermal expansion of reference material...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006478
EISBN: 978-1-62708-190-0
..., to investigate microstructural change during thermal cycling, to monitor void formation and reinforcement damage during loading, and to study crack growth during fatigue. Ultrasonic methods are suitable for obtaining reinforcement parameters and are an efficient tool for investigating elastic...