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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c9001578
EISBN: 978-1-62708-233-4
... Control Case #14: DC Motor Process Related Vibration Case #15: Line Harmonics The entire structure of a hydroelectric dam would begin to vibrate whenever a hydroelectric turbine operated in a certain load range. The vibration problem was identified as Rheingan's Influence. Rheingan's Influence...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001499
EISBN: 978-1-62708-236-5
... position under a reverberating load for an extended period of time. Loads (forces) Reflection Spur gears Vibration 8622 UNS G86220 (Other, miscellaneous, or unspecified) wear Three spur gears that had formed a straight-line train in a speed reducer were brought in for examination...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001026
EISBN: 978-1-62708-214-3
... of the closed crack, which was in every respect similar to the fractured cracks comprising flakes 1, 2, and 3. Thus, it can be assumed that the cracks existed before plating. Furthermore, the grain-boundary morphology features, such as the grain-boundary grooving and the terraces, did not match on mating...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001815
EISBN: 978-1-62708-180-1
... stress gradients are usually indicative of high stress levels. Figure 10 shows two matching teeth in contact at or near the pitchline. Note the high concentration of compressive stress at the pitchline or point of contact, the concentration of tensile stress at the root radius of the loaded side...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001306
EISBN: 978-1-62708-215-0
.... The dual rear wheel assembly on the left side of a single rear axle heavy truck completely separated from the hub. The wheel assembly was mounted to the hub by 10 left hand thread wheel studs and twenty speciality nuts designed to match the wheels. The truck was relatively new at the time of this incident...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001846
EISBN: 978-1-62708-241-9
... that the main shaft also carried a homogeneous axial tensile stress without the inclined load before fracturing. Fig. 4 Macromorphology of the matched fracture of main shaft: ( a ) side of journal B and ( b ) side of journal C Fig. 5 Micromorphology of fracture (side of journal B...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006803
EISBN: 978-1-62708-329-4
... assessment random variables reliability methods simulation methods uncertainty PROBABILISTIC ANALYSIS methods for life assessment of structural components were initially developed because engineers realized that the values in loads, material properties, geometries, and, perhaps most importantly...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001715
EISBN: 978-1-62708-219-8
... evaluated. Most of the 50 samples were matched pairs of fracture surfaces, with approximately three feet of wire on each side of the fracture. From these samples, 11 or so fracture surface pairs (the fractures that had limited corrosion damage) were evaluated in more detail. Additional samples were...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001762
EISBN: 978-1-62708-241-9
... shows one of the semi-float axle failures from the test. This shape of the fracture is similar to the shape of most of the axle fractures which have been observed in service. Figure 4 shows the matching half of the test axle fracture. A wide range in the loads at the rim required to cause failure can...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006760
EISBN: 978-1-62708-295-2
... ( Fig. 7 ). Fig. 7 (a) Intergranular crack in Monel. (b) Transgranular crack in aluminum Fatigue cracks propagate in components subject to cyclic loading, iniating at a stress concentrator. The crack grows progressively, sometimes extending with each loading cycle. The surface is generally...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001706
EISBN: 978-1-62708-217-4
... of the pit. The crack reached the critical size and caused failure by stress-corrosion cracking (SCC) under static loading conditions in service. The failed beam was protected by a well adhering paint system. However, the presence of adequate amounts of corrosion preventive compound films (CPC...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003542
EISBN: 978-1-62708-180-1
... in comparison with the strength of grains or when cleavage planes of neighboring grains match up with (or nearly match up with) each other (in other words, when misorientations between cleavage planes are small). A high percentage of transgranular fracture tends to produce relatively smooth fracture surfaces...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001122
EISBN: 978-1-62708-214-3
... and splinters has been discussed by Hultgren ( Ref 8 ) and by Naumann and Spies ( Ref 9 ). At first, only the maul and chip were provided for analysis. When a match could not be made between the chip and the maul, the sledgehammer was requested. Examination revealed that the chip matched the striking...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001021
EISBN: 978-1-62708-214-3
... in other spars in service, the Royal Australian Air Force requested that the crack growth rate during service be determined. The loading history of the aircraft was made available in the form of flight by-flight records of the counts from the vertical accelerometer sensors fitted to the airframe...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001593
EISBN: 978-1-62708-234-1
...) in the attenuated total reflectance (ATR) mode. The results obtained on the sensor body yielded an excellent match with those obtained on the molding resin. Both spectra exhibited absorption bands characteristic of a polysulfone resin. This is illustrated in the spectral comparison presented in Fig. 3...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001038
EISBN: 978-1-62708-214-3
... replicas. The examinations indicated that fatigue cracks had originated at the rim backside and propagated to the rim midsection. Catastrophic failure occurred at a final overland. Fatigue fracture of the wheel rim was attributed to cyclic loading created by improper wheel mounting of a spare tire...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001077
EISBN: 978-1-62708-214-3
... adjacent broken teeth and large chip indicated that the main cracks had propagated progressively from the driven convex side of the teeth downward toward the concave side ( Fig. 2 ). The primary crack initiation sites appeared to be below the gear surface on both teeth. By matching the fracture surfaces...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001787
EISBN: 978-1-62708-241-9
... profiles) and the cumulative effect of torque and force loading (the byproduct of continuous twisting and axial impact). Cracks readily initiate under these conditions then propagate quickly through what was found to be networks of tempered martensite, thus resulting in premature failure. drill bit...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001528
EISBN: 978-1-62708-219-8
...). The black foam insulation and the reddish brown debris from the tank OD were analyzed by Fourier transform infrared (FTIR) methods per ASTM E 1252-98 using the KBr pellet technique. However, a computer-aided comparison with over 7200 library spectra provided no definitive match with the FTIR spectrum...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003536
EISBN: 978-1-62708-180-1
... 1.2655 14 6 1.1694 13 7 1.0906 12 8 1.0336 11 9 1.0037 10 (a) a i values are symmetric with respect to α = 90° (see text for context). Source: Ref 22 Number density of processing defects in the tensile fracture surface of metal-matrix composite specimen with loading...