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Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001030
EISBN: 978-1-62708-214-3
...Abstract Abstract Cracks were discovered between interference-fit fasteners (MoS2-coated Ti-6Al-4V) that had been incorporated into a fighter aircraft primary structural frame (D6ac steel) to enhance structural fatigue life. Examination of sections cut from the cracked frame established...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0091674
EISBN: 978-1-62708-217-4
...) supported the conclusion that the failure of the hinge brackets occurred by SCC. The corrosion was caused by exposure to a marine environment in the absence of paint in stressed areas due to chipping. The stress resulted from the interference fit of the bushing in the lug hole. Recommendations included...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0047710
EISBN: 978-1-62708-225-9
..., or welding procedure. Fitting Interference 9310 UNS G93100 Joining-related failures A 9310 steel gear was found to be defective after an unstated period of engine service. A linear crack approximately 25 mm (1 in.) long was discovered by routine magnetic-particle inspection of an electron beam...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c0046155
EISBN: 978-1-62708-233-4
... was the primary cause of failure. Rubbing of the faying surfaces worked the interference area on the post until small tears developed. These small tears became stress-concentration points that nucleated fatigue cracks. Recommendations included rounding the edge of the box in the area of contact with the post...
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
... at the lowest point of single-tooth contact. The cause of failure was tooth-tip interference from the mating gear teeth. Because the mating parts within the assembly had not been returned or examined, unanswered questions remained. Axles Interference Mining Motor trucks 43BV12 Rolling-contact wear...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0047673
EISBN: 978-1-62708-217-4
... weld-tool positioning. The problem could be solved by better forming procedures to provide an accurate fit-up that would not interfere with electrode alignment. Aircraft components Fuel tanks Welding parameters 2024-T62 UNS A92024 Joining-related failures A series of resistance spot...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001575
EISBN: 978-1-62708-217-4
... of Cu alloy (AMS4845) bushings force fit into AA2024-T3 Al alloy spacing elements. It was found that uncontrolled fit interference between the two components had led to Cu alloy overstress. Thermal cycling under operating conditions yielded the material. The dilation was directed inward to the shaft...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0090463
EISBN: 978-1-62708-234-1
... contributing factor was the design of the part, which produced significant interference stresses between the contact and a mating retaining tab. Creep strength Housings Polycarbonate Brittle fracture A housing used in conjunction with an electrical switch failed shortly after being placed...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c0046160
EISBN: 978-1-62708-224-2
... fracture. Axial shift of the crane wheel during operation, because of insufficient interference fit, was the major cause of fatigue cracking. Recommendations included redesigning the axle to increase the critical diameter from 140 to 150 mm (5.5 to 6 in.) and to add a narrow shoulder to keep the drive...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0048661
EISBN: 978-1-62708-225-9
... permitted movement that resulted in fatigue failure. Fretting of the pin and drive shaft was observed but did not appear to have contributed to the failure. To prevent reoccurrence, the assembly should be redesigned to include an interference fit between the shaft and the drive wheel. The drive wheel...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001547
EISBN: 978-1-62708-225-9
... that stress concentration depended on end hook bend sharpness. Also, interference fits are to be avoided in the end hooks of small springs. Additionally, a need for careful consideration of the stress-corrosion properties of candidate materials for spring applications has been demonstrated by stress-corrosion...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0092148
EISBN: 978-1-62708-235-8
... caused unstable retained austenite in the failed cylinder to transform to martensite. The increase in volume resulted in sufficient size distortion to cause interference between the cylinder and the spool, seizing, and loss of flow control. The failed parts had been carburized in a process in which...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001510
EISBN: 978-1-62708-217-4
... to a stress corrosion crack that formed on the internal diameter of the grip beneath an interference fit steel bearing liner and propagated along the short transverse plane through the thickness of the component until leakage occurred. The high residual stresses present due to machining of the inner diameter...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001647
EISBN: 978-1-62708-235-8
... ). Fig. 1 3013 outer container (left) and inner container for handling and storage of plutonium-bearing materials The outer container is fabricated from type 316L stainless steel. The lid, when inserted into the outer container, creates an interference fit that forms a square-groove corner joint...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001828
EISBN: 978-1-62708-241-9
... is shown in Fig. 6 . The bearing material is ASTM A296 CA40 with a hardness of HRC 28 to 32. Bearing Journal: The bearing journal material is ASTM A296 Grade CA40. The journal is shrink fitted on the pump shaft with a controlled interference fit of 0.05 to 0.127 mm. The journal is located against...
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
... of thermal expansion, will contract to a much greater extent than the metal insert. This difference in thermal expansion causes a high level of interference hoop stress on the plastic material at the interface. Such stresses are exerted on the part as soon as it cools from the molding process...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001796
EISBN: 978-1-62708-241-9
...–0.15 3.40 4.10 4.20 1.20 Fig. 2 ( a ) Overall macrophoto of the submitted specimens for metallurgical evaluation tri-lobe cylindrical roller bearing and ( b ) schematic drawing of the tri-lobe bearing showing three interference points in the circumference of the outer ring where...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001199
EISBN: 978-1-62708-235-8
... the laked area and the general surface of the casting and the occurrence of porosity along the interface was confirmed using the Nomarski interference contrast technique with a Zeiss microscope ( Figs. 3 ). Fig. 3 a). Porosity of the low side of the interface, dark field illumination. 50× b). Change...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001387
EISBN: 978-1-62708-215-0
... of the nickel anode ( Fig. 2 ) was visible, as was the presence of an adherent deposit (1.5 to 2.5 mm, or 0.06 to 0.098 in., thick) on the adjacent cathode. The nickel anode surface showed the presence of interference colors, and the rubber gasket separating the nickel anode from the cover plate ( Fig. 1...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001844
EISBN: 978-1-62708-241-9
..., specified as HRC 56–60 and HRC 30–45. The cracked gear and the gear-shaft were interference-fitted. The shaft bore and the oil-pressed hole of gear are required to be surface-coated to prevent carburizing. Fig. 1 Cracked gear and gear-shaft assembled (offered by manufacturer) Experiments...