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induced fatigue precrack

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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
..., SCC in titanium alloys can be readily demonstrated in precracked fracture mechanics specimens in a variety of environments, although failures in service tend to be rare because the great resistance to pitting of such systems makes crack initiation difficult ( Ref 204 ). However, if the passive film is...
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
... precracked specimens have been employed to estimate propagation behavior of components. Explicit consideration of microstructure in these relations has been limited, and mechanisms are not completely understood ( Ref 2 ). In this approach, it is typically assumed that the life is decomposed between...
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
.... The lower limit of the resultant curve is a threshold for hydrogen embrittlement ( Fig. 10 ). Fig. 9 Fatigue-cracked cantilever beam test specimen and fixtures Fig. 10 Procedure to obtain K IHE with precracked cantilever beam test specimen The K IHE results of a...
Series: ASM Handbook
Volume: 12
Publisher: ASM International
Published: 01 January 1987
DOI: 10.31399/asm.hb.v12.a0000607
EISBN: 978-1-62708-181-8
... compact tension test specimen of rail steel (0.69 to 0.82% C). Fig. 311 : Fracture surface of typical specimen from rail head. Crack plane lies in the cross section. First two circles at top identify precracked region. Fatigue crack propagation extends from second to sixth circle (from top to bottom...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003225
EISBN: 978-1-62708-199-3
... cracks; the cross section is reduced to where it can no longer support the maximum applied load, and fast fracture ensues. Frequently, the progress of a service-induced fatigue crack is indicated by the presence of a series of macroscopic crescents, called beach marks, progressing from the origin of...
Series: ASM Handbook
Volume: 12
Publisher: ASM International
Published: 01 January 1987
DOI: 10.31399/asm.hb.v12.a0000609
EISBN: 978-1-62708-181-8
... pressure. Fig. 576 : Fracture surface. Note machined and fatigue precracked flaw at top center. Region of fatigue sharpened notch had a dimpled morphology; farther away from the flaw, a cleavage morphology. Fig. 577 : Schematic of fracture surface in Fig. 576 . Initial failure was by ductile...
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...
Series: ASM Handbook
Volume: 12
Publisher: ASM International
Published: 01 January 1987
DOI: 10.31399/asm.hb.v12.a0000621
EISBN: 978-1-62708-181-8
... transition from the fatigue-precrack region (below arrows) to the tension-overload plane-strain fracture region (above arrows). Specimen was aged 24 h at 120 °C (250 °F); tensile strength was 593 MPa (86 ksi), and uniform elongation was 13%. Note the appreciable number of vertical delaminations (as at A's...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005324
EISBN: 978-1-62708-187-0
..., fatigue properties, fracture toughness, and physical properties of ductile iron and compares them with other cast irons to aid the designer in materials selection. It concludes with information on austempered ductile iron. ductile iron castings austempered ductile iron compressive properties...
Series: ASM Handbook
Volume: 13B
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v13b.a0003822
EISBN: 978-1-62708-183-2
... testing is generally of little value in diagnosing the subtle embrittling effects of hydrogen. Titanium alloys tend to exhibit susceptibility under biaxial or triaxial stress states; therefore, bend tests, cup tests, notched tensile, or loaded precracked fracture toughness tests are generally more...
Series: ASM Handbook
Volume: 12
Publisher: ASM International
Published: 01 January 1987
DOI: 10.31399/asm.hb.v12.a0001834
EISBN: 978-1-62708-181-8
... images at the same magnification. All four fractographs are of different areas. Figure 6 shows the interface between the fatigue precrack and test fracture of an X-750 nickel-base superalloy subsize Charpy rising-load test specimen after testing in pure water at 95 °C (200 °F). The interface region...
Series: ASM Handbook
Volume: 13B
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v13b.a0003815
EISBN: 978-1-62708-183-2
... precracked thick, double-cantilever beam specimens of high-strength 2 xxx -series aluminum alloy plate, TL (SL) orientation. Specimens were wet twice a day with an aqueous solution of 3.5% NaCl, 23 °C (73 °F). (b) Crack propagation rates in stress-corrosion tests using precracked specimens of 7 xxx -series...
Series: ASM Handbook
Volume: 12
Publisher: ASM International
Published: 01 January 1987
DOI: 10.31399/asm.hb.v12.a0001831
EISBN: 978-1-62708-181-8
... declining-load portion of the fatigue cycle. This results in a compressive stress at the crack tip due to the relaxation of the residual elastic tensile stresses induced in the uncracked portion of the material during the rising load cycle ( Fig. 23b ). The closing crack does not reweld, because the new...
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: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006462
EISBN: 978-1-62708-190-0
... elastic fracture mechanics design assumes the presence of structural defects and then allows the designer to answer the following questions: What is the critical flaw size that will cause failure for a given component subject to service stress and temperature conditions? How long can a precracked...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003057
EISBN: 978-1-62708-200-6
Series: ASM Handbook
Volume: 4E
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.hb.v04e.a0006266
EISBN: 978-1-62708-169-6
... solidification. In wrought alloys, homogenization of ingots for subsequent wrought processing is important, because solute inhomogeneity can adversely affect the hot workability (from grain-boundary liquation or cracking) and induce formation of undesired phases as a result of segregation (see also the article...
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
... involved in the most dangerous form of degradation, environment-assisted cracking (EAC). (The terms environment-assisted cracking and environment-induced cracking are often used interchangeably.) With some exceptions, most implant materials are not susceptible in the human body environment to the...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003120
EISBN: 978-1-62708-199-3
... superalloys generally have more uniform, and usually finer, grain sizes and improved tensile and fatigue properties. Nickel- and iron-nickel-base superalloys of the Ni-Ti/Al type typically consist of γ′ dispersed in a γ matrix, and the strength increases with increasing V f γ′. The lowest V f...
Series: ASM Handbook
Volume: 4E
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.hb.v04e.a0006261
EISBN: 978-1-62708-169-6
... alloys. Perhaps the most common other role of matrix carbides (also shared by grain-boundary carbides) is a negative one: They may participate in the fatigue-cracking process by premature cracking or by oxidizing at the surface of uncoated alloys to cause a notch effect. Oxidized carbides or precracked...