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device redesign

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0047059
EISBN: 978-1-62708-217-4
...). Considerable vibration was created in the installation because of the design of the mechanical device used to transmit power to the governor. The pins were permitted to slide axially a small distance. Analysis (visual inspection, microscopic examination, and ductility measurements) supported the conclusion...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c0048169
EISBN: 978-1-62708-233-4
..., or torsional, load was rotational vibration of the assembly in which the spring imparted a relatively constant thrust load. The three tabs were antirotational devices and were subjected to unintentional torsional vibrations. These torsional vibrations created the cyclic loading that resulted in fracture...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001074
EISBN: 978-1-62708-214-3
... by the presence of shrinkage cavities, which lowered the load-bearing capability. The failure occurred at the location where there was an abrupt change in the section thickness. A redesign to provide a smooth contour at the section junction was recommended along with optimization of casting parameters to avoid...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003504
EISBN: 978-1-62708-180-1
... the presence of the word “maintenance” in its name, RCM is not simply a method for developing maintenance programs; its recommendations reach far beyond the maintenance department. A RCM review may trigger actions for engineering (redesign), for training and technical documentation (addressing human error due...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.homegoods.c0090457
EISBN: 978-1-62708-222-8
... fracture Components of a latch assembly used in a consumer device exhibited a relatively high failure rate. The latches are used as a safety restraint, and failure in the field could result in severe injury. The failures were occurring after installation but prior to actual field use. Specifically...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001265
EISBN: 978-1-62708-215-0
... methacrylate monomer polymerized in place, and barium sulfate, which serves as a radiopacifier) or by the growth ofbony tissue into the interstices of metal beads sintered onto the metal substrate. This porous structure allows bone tissue to grow into and mechanically lock the device in place. Circumstances...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001117
EISBN: 978-1-62708-214-3
..., four small, blackened spots on the OD of couplings that were the same diameter (180 mm, or 7 in.) as the failed couplings were observed. Subsequent discussion revealed that for small OD couplings, the plater used a special four-fingered arm to pass the plating current. This device was not needed...
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
... directly in lbf at each frequency present. Equally spaced photoreflective tapes were placed at 20 locations around the output hub of the gearcase for the second measurement. A photocell device was then mounted to pick up the pulse train of the reflective tapes. The output from the photocell provided...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003500
EISBN: 978-1-62708-180-1
... instrumentation Improper coupling Improper bearing Improper seal Insufficient shutdown devices Material of construction Corrosion and/or erosion Rapid wear Fatigue Strength exceeded Galling Wrong hardening method Design for installation Unsatisfactory piping support Improper piping flexibility Undersized...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006753
EISBN: 978-1-62708-295-2
... to prevent contact with the blade shoulders as assembled. Example 2: Sprocket Locking Device Failure <xref rid="a0006753-ref28" ref-type="bibr">(Ref 28)</xref> A design deficiency involving improper materials selection was revealed through the analysis of a failed tapered-ring sprocket locking device...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001813
EISBN: 978-1-62708-180-1
.... The three tabs were antirotational devices and were subjected to unintentional torsional vibrations. These torsional vibrations created the cyclic loading that resulted in fracture. The examples that follow demonstrate how improper fabrication can result in failure. Figure 15(b) shows the fracture...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003519
EISBN: 978-1-62708-180-1
.... 3 Example of a failure mode assessment chart (for fault tree of forgings defects in Fig. 2) Fig. 4 Example of a technical plan for resolution Fig. 5 Example of corrective action tree for forgings with dye-penetrant defects. LIMCA, liquid metal cleanness analyzer device...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.9781627082952
EISBN: 978-1-62708-295-2
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001812
EISBN: 978-1-62708-180-1
... by mechanically upsetting one end. Blind Fasteners Blind fasteners are usually multiple-piece devices that can be installed in a joint that is accessible from only one side. When a blind fastener is being installed, a self-contained mechanism, an explosive, or other device forms an upset...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003525
EISBN: 978-1-62708-180-1
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001816
EISBN: 978-1-62708-180-1
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001811
EISBN: 978-1-62708-180-1
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003553
EISBN: 978-1-62708-180-1
... Three changes were made to improve the resistance of the contact-finger retainers to SCC. The slots were redesigned to have inside corner radii of 3.2 mm (0.125 in.) to reduce the stress concentration associated with the square corners in the original design, and the formed retainers were shot blasted...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001808
EISBN: 978-1-62708-180-1
..., and unidirectional bending usually produce the beach-mark pattern shown in Fig. 2(j) . Example 1: Unidirectional-Bending Fatigue Failure of an A6 Tool Steel Shaft The shaft shown in Fig. 3 was part of a clamping device on a tooling assembly used for bending 5.7-cm (2.25-in.) outer-diameter tubing on an 8.6...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003543
EISBN: 978-1-62708-180-1
...-consuming and potentially expensive process of redesign may indeed be necessary for prevention of further failures in some cases. However, from the standpoint of practical failure analysis, a wide variety of manufacturing and material characteristics can act singly or combine synergistically to reduce...