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crack initiation testing

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Published: 01 August 2005
Fig. A4.3 Comparison of fatigue crack initiation test data and LOOPIN 8 prediction using the uncut spectra. Source: Ref A4.6 More
Image
Published: 01 August 2005
Fig. A4.4 Comparison of fatigue crack initiation test data and LOOPIN 8 prediction using the post -RACETRAK spectra (DMIN = 0.25). Source: Ref A4.6 More
Image
Published: 01 August 2005
Fig. A4.5 Comparison of fatigue crack initiation test data and LOOPIN 8 prediction using the post -RACETRAK spectra (DMIN = 0.50). Source: Ref A4.6 More
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Published: 30 November 2013
Fig. 11 Fatigue-tested titanium component with cracks initiating in each of three knife seals. The oxide colors reflect the oxide thickness, which would be thicker close to the origin areas. More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540383
EISBN: 978-1-62708-309-6
...; comparisons between analytically predicted lives and fatigue test data are shown in each figure. Comparing the stress versus life curves, it is evident that the predicted results for all three versions of each spectrum are almost the same. Fig. A4.3 Comparison of fatigue crack initiation test data...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.fdsm.t69870123
EISBN: 978-1-62708-344-7
..., neither of which are related to a physical crack initiation event, are subsequently presented along with several applications showing how the different methods compare. The examples provided include two-level and multilevel tests, a gas-turbine engine compressor disk, and the cumulative damage associated...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270165
EISBN: 978-1-62708-301-0
... Abstract Two filtration components installed on a developmental aircraft cracked during pressure impulse testing. Both parts were made from an aluminum alloy, solutionized and aged, and cracked due to fatigue. In both cases, the crack initiated at a transition region on an inner surface...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610377
EISBN: 978-1-62708-303-4
... fatigue, those being matrix cracking, fiber breaking, crack coupling, delamination initiation, and delamination growth. The chapter describes each mechanism in detail along with related factors. It also discusses the primary differences between composites and metals, the effect of manufacturing defects...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2017
DOI: 10.31399/asm.tb.sccmpe2.t55090367
EISBN: 978-1-62708-266-2
... Abstract This chapter addresses the challenge of selecting an appropriate stress-corrosion cracking (SCC) test to evaluate the serviceability of a material for a given application. It begins by establishing a generic model in which SCC is depicted in two stages, initiation and propagation...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270080
EISBN: 978-1-62708-301-0
... to be a brittle fracture that initiated from a zone of poor-quality weld. It also provides photographic evidence of a weld crack in the heat-affected zone and includes a drawing of a modified weld design that passed subsequent testing. fractography metallography tie rod visual examination Summary...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270177
EISBN: 978-1-62708-301-0
... Abstract A driven gear in the gear box of an aircraft engine fractured after a 40 h test run. The driving gear and gear shaft were also damaged. Based on the results of fractography, chemical analysis, metallography, and hardness testing, the fracture was caused by a fatigue crack initiating...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780238
EISBN: 978-1-62708-281-5
... Abstract This article reviews fatigue test methodologies, provides an overview of general fatigue behavior (crack initiation and propagation) in engineering plastics, and discusses some of the factors affecting the fatigue performance of polymers. In addition, it provides information...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270143
EISBN: 978-1-62708-301-0
... by mechanical damage. coating cracks fatigue failure fractography turbine rotor blade visual examination Summary A low-pressure turbine rotor (LPTR) blade failed during a test run causing damage to all the blades. The blade had failed by fatigue and the fatigue crack had initiated at surface...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540121
EISBN: 978-1-62708-309-6
... of standardization, the term “fatigue life” must be defined. For stress-life data such as those shown in Fig. 3.12 , tests usually are carried out until the specimen breaks into two parts. Before the advent of fracture mechanics technology, there was no need to distinguish between crack initiation and propagation...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030126
EISBN: 978-1-62708-282-2
... is present in the material, then the time to initiate a crack may be reduced dramatically ( Ref 8 ). Fig. 1 Schematic of a typical time to failure as a function of initially applied stress for smooth sample stress-corrosion cracking tests Tests on Statically Loaded Precracked Samples Tests...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2017
DOI: 10.31399/asm.tb.sccmpe2.t55090001
EISBN: 978-1-62708-266-2
... as a function of initially applied stress for smooth-sample stress-corrosion cracking (SCC) tests Tests on Statically Loaded Precracked Samples Tests on statically loaded precracked samples are usually conducted with either a constant applied load or with a fixed crack opening displacement...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780249
EISBN: 978-1-62708-281-5
... tested at stress amplitude (σ α ) = 25.4 MPa (3.68 ksi) and in high-impact polystyrene tested at σ α = 11.6 MPa (1.68 ksi) An FCP mechanism frequently involves damage formation, which precedes crack initiation and propagation. On the other hand, the micromechanism underlying yielding (softening...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610303
EISBN: 978-1-62708-303-4
.... The chapter describes some of methods used to determine maximum permissible crack size and predict growth rates. It explains how the information can then be used to control fractures through periodic inspection, fail-safe features, mandated retirement, and proof testing. It presents a number of fracture...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270128
EISBN: 978-1-62708-301-0
... two distinct regions Testing Procedure and Results Macroscopy Under the stereobinocular microscope, a series of half-moon-shaped beach marks were seen in the smooth region ( Fig. CH27.3 ). These marks are typical of fatigue crack propagation. The innermost mark was found to surround...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 1997
DOI: 10.31399/asm.tb.wip.t65930113
EISBN: 978-1-62708-359-1
.... There is a requirement of increasing crack arrest capability in the base metal as failure becomes less tolerable, this capability being measured by the Pellini drop weight test. Fracture initiation is primarily seen as a weld metal and HAZ problem, and CTOD fracture toughness requirements for cases of high initiation...