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fatigue cracks

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Published: 30 November 2013
Fig. 10 Subcase-origin fatigue. (a) As the name implies, subcase fatigue cracks originate deep within the steel at the region below the case, where the core metal is comparatively soft in relation to the case itself. The fatigue cracks spread laterally, parallel to the surface, and then join More
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Published: 01 November 2012
Fig. 24 Subcase-origin fatigue. (a) As the name implies, subcase fatigue cracks originate deep within the steel at the region below the case, where the core metal is comparatively soft in relation to the case itself. The fatigue cracks spread laterally, parallel to the surface, then join More
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Published: 01 January 2000
Fig. 62 Corrosion-fatigue cracks in carbon steel. A nital-etched section through corrosion-fatigue cracks that originated at hemispherical corrosion pits in a carbon steel boiler tube. Corrosion products are present along the entire length of the cracks. 250× More
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Published: 01 July 2009
Fig. 10.4 Location and distribution of small fatigue cracks found in a High-Pressure Oxidizer Turbopump disk More
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Published: 01 March 2006
Fig. 10.15 Ultrasonic technique for detecting early fatigue cracks. (a) Test configuration and specimen. (b) S-N curves for notched 2014-T6 0.60 in. sheet. Source: Ref 10.18 More
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Published: 01 December 1999
Fig. 4.19 Average propagation rate of fatigue cracks in carburized cases of (a) 20 HNMh and (b) 18 HGT steel depending on percentage of retained austenite and on load amplitude. Source: Ref 8 More
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Published: 01 November 2007
Fig. 10.57 Appearance of thermal fatigue cracks occurred on a carbon steel waterwall tube (viewed from 12 o’clock crown position) due to water spraying from waterlances. Source: Ref 40 More
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Published: 01 November 2007
Fig. 10.58 Optical micrograph showing circumferential thermal fatigue cracks that developed on a carbon steel waterwall tube (shown in Fig. 10.57 ) due to water spraying from waterlances. Source: Ref 40 More
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Published: 01 August 1999
Fig. 12 Section showing fretting damage and fatigue cracks in Al-6Zn·3Mg alloy More
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Published: 30 November 2013
Fig. 20 Sketch of a Belleville spring washer showing how fatigue cracks can form in a nominally compressive stress area. The spring, actually a cone-shaped spring steel washer, is shown in the (a) free condition and in the (b) flattened condition. When flat, the corner of the hole More
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Published: 01 December 2015
Fig. 18 Section showing fretting damage and fatigue cracks in Al-6Zn-3Mg alloy. Courtesy of R.B. Waterhouse, University of Nottingham More
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Published: 01 August 2005
Fig. 13 Metal fatigue cracks around a small window in the upper fuselage developed during pressurization and depressurization cycles. These cracks resulted in disastrous structural failure of the pressure cabin. More
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Published: 01 October 2005
Fig. CH33.6 SEM fractograph showing two fatigue cracks More
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Published: 01 October 2005
Fig. CH46.3 Fracture surface opened up for investigation, showing two fatigue cracks initiating on opposite sides of the disc diaphragm More
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Published: 30 June 2023
Fig. 11.13 Surface fatigue cracks on Curiosity forged wheel. Courtesy of Scot Forge More
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Published: 01 December 1989
Fig. 9.30. Initiation of thermal-fatigue cracks in the interdiffusional zone (a) and the coating (b) of a Udimet 720 blade coated with aluminide (RT-22) ( Ref 56 ; courtesy of V.P. Swaminathan, South West Research institute, San Antonio, TX). More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540379
EISBN: 978-1-62708-309-6
... Abstract This appendix presents an analytical model that estimates damage rates for both crack initiation and propagation mechanisms. The model provides a nonarbitrary definition of fatigue crack initiation length, which serves as an analytical link between initiation and propagation analyses...
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Published: 01 December 1989
Fig. 4.47. Fatigue-crack-growth rates of long cracks for various high-temperature alloys in air at (left) room temperature and (right) 850 °C (1560 °F) ( Ref 186 ). More
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Published: 01 November 2012
Fig. 58 Influence of texture on fatigue crack growth in Ti-6Al-4V. Fatigue crack growth rates are higher when basal planes are loaded in tension. The elastic modulus in tension for the basal texture (B) is 109 GPa (15.8 × 10 6 psi); for the transverse texture (T), 126 GPa (18.3 × 10 6 psi More
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Published: 01 October 2011
Fig. 7.25 Fatigue crack growth per fatigue cycle ( da / dN ) versus stress intensity variation ( Δ K ) per cycle. The C and n are constants that can be obtained from the intercept and slope, respectively, of the linear log da / dN versus log Δ K plot. This equation for fatigue crack More