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fatigue testing

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Published: 01 June 2019
Fig. 1 Carbon steel counterbalance spring that failed during fatigue testing. (a) Macrograph showing fracture locations (arrows). 1 3 ×. (b) Fracture surface showing dark band (arrow) that nucleated fracture. 6×. (c) Etch pits in surface. 100× More
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Published: 01 June 2019
Fig. 1 Typical retaining rod subject to spectrum load fatigue testing, shown in the as-received condition. Failure of these rods occurred in the threads, indicated by the arrow. Reduced 75% More
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Published: 01 December 1992
Fig. 18 Results of rotating beam fatigue testing of impeller specimens (alternating stress versus cycles to failure). More
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Published: 01 June 2019
Fig. 9 Low cycle fatigue test data. More
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Published: 01 June 2019
Fig. 1 Phosphor bronze (C51000) spring that failed prematurely during fatigue testing. Failure was due to the presence of a tool mark (indentation) at a bend. (a) Setup for fatigue testing, and detail of the spring showing location of crack at bend 2. (b) A broken end of the spring, 40 More
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Published: 01 December 2019
Fig. 6 Results of rolling contact fatigue test: ( a ) varies of friction coefficient with the test time,; and ( b ) FWHM along the radii of test samples) More
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Published: 01 January 2002
Fig. 31 Fracture surfaces of a torsional fatigue-test specimen. Courtesy of Greg Fett, Dana Corporation More
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Published: 01 December 1992
Fig. 1 Laboratory-fatigue-tested cross member sample 1, showing cracking progression from internal fillet-welded diaphragm through channel side wall at location indicated by arrow. More
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Published: 01 December 1992
Fig. 4 Internal view of cracking on fatigue-tested sample 9. Cracking is evident at toes of both fillet welds, as indicated by arrows. More
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Published: 01 December 1992
Fig. 6 Fracture surface at fillet weld toe of fatigue-tested sample 9. The area denoted by “S” was removed for SEM examination, and a metallographic section was taken at location “M”. More
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Published: 01 December 1992
Fig. 7 Fracture surface at torque rod mounting hole on fatigue tested sample 9. More
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Published: 01 December 1992
Fig. 8 SEM image of fracture origin area at weld toe on fatigue tested sample 1. Ratchet mark at lower center is indicative of fatigue cracks initiating on different planes. 13×. More
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Published: 01 June 2019
Fig. 3 Rig for Testing Bells for Bursting or for Fatigue More
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001041
EISBN: 978-1-62708-214-3
... Abstract Four truck cross members intended for use in heavy-duty transport trucks were investigated. Two of the members had cracked on a prototype vehicle and two had been fatigue tested in the laboratory. The cross members were fabricated from SAE 950X plate and consisted of a formed channel...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c0090626
EISBN: 978-1-62708-218-1
... Abstract A steel spring used in an automotive application suddenly began to fail in the field, although “nothing had changed” in the fabrication process. Fatigue tests using springs fabricated prior to field failures lasted 500,000 cycles to failure, whereas fatigue tests performed on springs...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001359
EISBN: 978-1-62708-215-0
... Abstract The cause of low fatigue life measurements obtained during routine fatigue testing of IMI 550 titanium alloy compressor blades used in the first stage of the high-pressure compressor of an aeroengine was investigated. The origin of the fatigue cracks was associated with a spherical...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c0047846
EISBN: 978-1-62708-218-1
... was removed in an effort to reduce cost and hence the shaft was subjected to increased vibration and shock loading. Insufficient fatigue limit of the shaft was revealed by fatigue testing of the shafts taken from stock in a rotating-beam machine. As a corrective measure, the fatigue limit of shafts...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001583
EISBN: 978-1-62708-217-4
... Abstract The purpose of this investigation was to determine the root cause of the differences noted in the fatigue test data of main rotor spindle assembly retaining rods fabricated from three different vendors, as part of a Second Source evaluation process. ARL performed dimensional...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c0089657
EISBN: 978-1-62708-233-4
... for each lot. Investigation (visual inspection, fatigue testing, 0.25x/0.35x/50x magnifications, 2% nital etched 60x/65x magnifications, and SEM views) showed that most of the service fractures occurred in pistons containing vermicular graphite. Recommendations included ultrasonic testing of pistons...
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
... the effects of load frequency and temperature, material condition, and manufacturing practices on fatigue strength. It provides information on subsurface discontinuities, including gas porosity, inclusions, and internal bursts as well as on corrosion fatigue testing to measure rates of fatigue-crack...