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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
... Examinations Neither a physical examination nor a metallurgical examination was performed. Final Analysis A telephone call was then made to the user. A list of questions and responses from this conversation follows: Q. What type of equipment did this speed reducer operate, and under what...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001497
EISBN: 978-1-62708-221-1
... of the teeth. Physical Appearance of Gear Most of the teeth had been chipped at the back angle, but evidently this was subsequential damage to the pinion failure. The tooth contact pattern of all teeth was well centered and uniformly polished on both sides. No wear was evident. Physical Examination...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c9001498
EISBN: 978-1-62708-218-1
... and spalling. The opposite sides of the teeth also showed full-length contact very low on the profile but did not show the same extensive pitting damage. Physical Examination Magnetic-Particle Inspection Magnetic-particle inspection revealed no indication of crack initiation. Tooth Characteristic...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001500
EISBN: 978-1-62708-221-1
... third tooth was broken at the toe end only; otherwise, all teeth were intact. All teeth showed uniform heavy contact, well centered on the profile of the convex (driven) side. Physical Examination Magnetic-Particle Inspection Magnetic-particle inspection showed a fatigue crack progressing...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001502
EISBN: 978-1-62708-234-1
... and the spur teeth), and tempered at 350 °F to a specified hardness of 55 HRC minimum on the hardened surface. Visual Examination Identification Markings None on either part; the markings were on the portion not returned. The part number had been submitted on the shipping papers. Physical...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001503
EISBN: 978-1-62708-234-1
... uniform contact area that is scuffed the full length of the pattern. The entire pinion head is black due to a heavy coating of iron-manganese-phosphate. Physical Examination Magnetic-Particle Inspection Magnetic-particle inspection revealed no indication of cracking. Surface Hardness Testing...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001501
EISBN: 978-1-62708-221-1
...) side. There is some scuffing low on the profile of the concave sides. Physical Examination Magnetic-Particle Inspection There is no evidence of tooth bending fatigue on either part. The several cracks indicated are associated with the spalling surfaces on the concave sides of the pinion teeth...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.rail.c9001496
EISBN: 978-1-62708-231-0
... hole (shown in Fig. 3 as point A). Physical Examination Magnetic-Particle Inspection Magnetic-particle inspection was used to determine any extended damage due to the primary failure of tooth bending fatigue of the gear. It indicated several other gear teeth progessing in the same failure...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001095
EISBN: 978-1-62708-214-3
... yearly up to the failure. There was a possibility that, during the prior reinstallation, a bolt or bolts may have been mistorqued, which led to the leakage, but this was never adequately determined. Visual Examination of General Physical Features Figure 1 shows the crane (1), the shielding plate...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006772
EISBN: 978-1-62708-295-2
.... Investigators are now capable of deploying various tools (laser scanning, photogrammetry, drones, etc.) to acquire high-quality, highly accurate data to successfully document accident scenes while preserving evidence for future examination. A model is a physical, mathematical, or logical representation...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003523
EISBN: 978-1-62708-180-1
... of Evidence The top initial priorities of any accident investigation are the accumulation of information immediately available at the time of the accident and the preservation of any physical evidence so that it may be examined at a later point in time. After an accident or failure occurs, the accident...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001092
EISBN: 978-1-62708-214-3
.... Drillings were taken from the core of the shaft for chemical analysis. Visual Examination of General Physical Features Figure 1 shows the as-received shaft. Severe surface damage was evident at two isolated zones that were diametrically opposed. This damage was characterized by generalized wear...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001057
EISBN: 978-1-62708-214-3
... Abstract A brass (CDA alloy 230) pipe nipple that was part of a domestic cold water bath system failed two weeks after installation. Macrofractography, SEM examination, metallography, and chemical analyses were performed on specimens cut through the main fracture surface. The physical...
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
... cycle fatigue associated with cyclic temperature changes from normal service. The design of the part and the material selection were significant contributing factors because of stresses induced during molding, physical aging of the amorphous polysulfone resin, and the substantial differential...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001285
EISBN: 978-1-62708-215-0
.... Pertinent Specifications The wire rope consisted of a 6 × 19 fiber core in the Seale arrangement, as specified. Visual Examination of General Physical Features Figure 1 shows the portion of the wire rope assembly submitted for analysis. The section of the system that failed is in the fore...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001090
EISBN: 978-1-62708-214-3
... microscopy (SEM) and metallographic examination. Visual Examination of General Physical Features The connector is shown in Fig. 1 . Beneath the stainless steel mesh outer covering, a thin-walled stainless steel bellows was brazed into the flanges at each end. The bellows had fractured near one end...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006870
EISBN: 978-1-62708-395-9
... Abstract This article examines the concept of fractography as applied to elastomeric rubbery materials. It considers four general categories of physical root failure causes: design defects, material defects, manufacturing defects, and service life anomalies. Examples of real-world failures...
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
... Examination of General Physical Features The fracture faces and the hub pieces were matched with previous photographs by bolt hole locations to allow all investigators to describe the failure in a consistent manner ( Fig. 1 a to c). One piece of the hub was missing at bolt hole No. 5 and that area (3-5...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.homegoods.c0091857
EISBN: 978-1-62708-222-8
... of the assembly and the bends at the bottom shoulders of the two mixer arms. Multiple fatigue crack origins on the inside radii of the bends at the bottom shoulders was revealed by analysis of the failed mixer blades. It was revealed by metallographic examination that the shoulders on the arms were cold bent...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001324
EISBN: 978-1-62708-215-0
... embrittlement Flue gases 430Ti Brittle fracture Stress-corrosion cracking Visual Examination of General Physical Features The flue gas expansion joint sample was examined using a low-power binocular microscope, and it was photographed in the as-received condition. Figure 1 shows the expansion...