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Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001797
EISBN: 978-1-62708-241-9
...Abstract Abstract Cam crack failures are a common occurrence in cam-follower systems often caused by excessive loading or inappropriate operating conditions. An investigation into such a failure was conducted to assess the effect of cam crack damage on the dynamic behavior of cam-follower...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001807
EISBN: 978-1-62708-241-9
...Abstract Abstract Rolling contact fatigue is responsible for a large number of industrial equipment failures. It is also one of the main failure modes of components subjected to rolling contact loading such as bearings, cams, and gears. To better understand such failures, an investigation...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001558
EISBN: 978-1-62708-217-4
... hydrogen main fuel control valve, which ruptured during testing of the rocket engine of which it was a part. The area where the crack initiated comprised a cut-out in the internal surface to accomodate a cam follower bearing which was part of the valve operating mechanism. A schematic of the longitudinal...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003558
EISBN: 978-1-62708-180-1
... Examples of wear showing loss of material, changes in dimension, and changes in appearance. (a) Erosion damage on a butterfly valve component. (b) Fretting damage on a friction band. (c) Sliding wear on a cam follower Fig. 4 Example of a log-log plot of wear data used to identify stable wear...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006789
EISBN: 978-1-62708-295-2
... joints, bolted flanges, shrink fits, all in the presence of vibrations; reciprocating arms; electrical contacts; wire ropes Rolling-sliding wear Rolling bearings; cam and follower; gears; wheel-rail system Abrasive wear by hard particles Ore-processing machinery; blades and buckets of earth...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001832
EISBN: 978-1-62708-241-9
... through a demister, a condenser, and a steam reheater. All vapors exhaust through an outlet HEPA filter, manual damper, and ventilation fan. A sample of the exhaust vapor is normally taken by a continuous air monitor (CAM) or by a portable air sampler if the CAM is out of commission. The purge...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001810
EISBN: 978-1-62708-241-9
... in Fig. 1 . Before picking, the torsion bar (9) is twisted via the cam (8), roller lever (6), and picking shaft (10) until the knee joint (5) tilts slightly beyond dead point. The front end of the torsion bar fits in the picking shaft, which is clamped on the picking lever (11) so that it performs...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c9001232
EISBN: 978-1-62708-233-4
... to searching for material faults. Several examples of notch-induced vibrational fractures are presented along with guidelines for investigating their cause. Axles Bending fatigue Bolts Cams Crankshafts St 37 Fatigue fracture Vibrational fractures are cracks formed during often repeated...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001814
EISBN: 978-1-62708-180-1
... are typical of tool and die failures and illustrate many of the features specific to such failures. Additional information can be found in the Selected References that follow this article. A basic approach can be followed for most tool and die failures that will maximize the likelihood of obtaining...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006818
EISBN: 978-1-62708-329-4
.... A crack followed the lower recessed contour of the large gear teeth and had an average depth of 1.6 mm ( 1 16 in.). Smaller cracks were also observed on the flat surfaces. (a) Actual size. (b) Etching the surface with 10% aqueous nitric acid revealed a white-etching appearance at the teeth...
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
... is that it is restricted to circumstances where a no-crack assumption can be applied. Nonetheless, some design guidelines for weldments (which inherently contain discontinuities) offer what amount to residual life and runout determinations for a variety of process and joint types that generally follow the safe-life...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001733
EISBN: 978-1-62708-225-9
... A fatigue fracture surface was typically flat, fibrous, and contained many secondary cracks. 19 A region of transverse ductile rupture showing evidence of microvold coalescence followed the fatigue fracture surface. Final failure occurred by longitudinal fracture due to overloading of remaining wire cross...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003516
EISBN: 978-1-62708-180-1
...Test results for a pressure vessel hatch cover (<xref rid="a0003516-s6-1-4" ref-type="sec">example 3</xref>) Table 5 Test results for a pressure vessel hatch cover ( example 3 ) Run No. Pressure Locking cams Hinge condition kPa psi 1 275.6 40 All attached Not intact 2...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006779
EISBN: 978-1-62708-295-2
... fluctuations. This article begins with an overview of fatigue properties and design life. This is followed by a description of the two approaches to fatigue, namely infinite-life criterion and finite-life criterion, along with information on damage tolerance criterion. The article then discusses...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c9001732
EISBN: 978-1-62708-218-1
... on the base of each pendulum. A striker was fixed to a test bench, and the lock engaged the striker as the pendulum dropped from an elevated position. The height of the pendulum was controlled by adjustable cams and set to produce impact loads at the striker equivalent to measured door slam loads. A schematic...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003571
EISBN: 978-1-62708-180-1
... gears and cams of various machines, tires, break pads, conveyors, hoppers, automobile body parts, aircraft, spacecrafts, hip/knee joint replacement, roller-skating wheels, and household appliances (washing machine, tubs, etc.). Wear of material parts is a very common cause of failure or low working life...
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
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006793
EISBN: 978-1-62708-295-2
... and chemical degradation and the existence of a stress threshold beyond which catastrophic wear occurs ( Ref 52 ). Two different types of test rigs have been developed for impact wear studies: ballistic impact testers and reciprocating hammer testers ( Ref 13 ). The following describes the features of each...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003524
EISBN: 978-1-62708-180-1
... is subject to variation depending on the nature of the failure and the availability of physical evidence or background information, there are stages that are common to all successful failure analyses. The combination of these stages comprises the total investigation and analysis. The following list includes...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003565
EISBN: 978-1-62708-180-1
... testers ( Ref 10 ). The following describes the features of each. A good correlation exists between increasing failure and the number of impacts. Increasing the number of impacts not only increases the number of cracks but also increases the wear at each crack before the coating eventually starts...