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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 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 systems...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c9001242
EISBN: 978-1-62708-223-5
... Abstract During dismantling of an eccentric camshaft of 340 mm diam that had worked for a total of 450,000 load reversals, it was found that it had cracked on both sides of the eccentric cam. The shaft was made of chromium-molybdenum alloy steel 34 Cr-Mo4 (Material No. 1.7220) according to DIN...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0048150
EISBN: 978-1-62708-235-8
... Abstract Grease-wiper springs for cams formed from stampings of 0.25-mm thick carbon spring steel (0.65 to 0.80% C) fractured at the 0.025 mm radius on the stamped 135 deg corner at a 90 deg bend after 5,000,000 cycles. Tool marks 2 to 2.3 mm from the center of the stamped bend were disclosed...
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 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 was conducted...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001804
EISBN: 978-1-62708-241-9
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
... 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 ventilation system is equipped with two outlet HEPA filters in parallel, with manual isolation valves allowing filter...
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 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
... shoe. The torsion bar can be adjusted to deliver the energy required to propel the projectile through the guide teeth to the shuttle brake [ 1 , 2 ]. The torsion bar mechanism is shown in Fig. 1 . Before picking, the torsion bar (9) is twisted via the cam (8), roller lever (6), and picking shaft...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c0047100
EISBN: 978-1-62708-233-4
... of the notch (arrow B) in some of these shafts. The ends of the plunger shafts (arrow C, Fig. 1a ) were significantly deformed by peening. The peening had been caused by the impact of the cam against the shaft end during service. Shaft hardness was found to be slightly lower than the minimum required...
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
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
... filaments of drive cable. Reduce axial tension on cables. Modify mechanical and/or chemical properties of drive cable to minimize fatigue sensitivity. Redesign drive assembly to eliminate drive cable—for example, use a cam system. ...
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
..., and gate valves were opened to reduce pressure. To increase the depressurization rate, several hatch covers were opened. These were opened by the workers kicking the locking cams or “dogs” with their feet. As a particular worker kicked the second locking cam open, the hatch cover failed with sufficient...
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
... 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 drawing of the door lock cycling fixture is shown in Fig. 2 , and a photograph of the test fixture in Fig. 3 . Fig. 2 Door lock...
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
... Wear processes and relevant tribosystems Wear process Examples of relevant tribosystems Sliding wear Sliding bearings; cam and tappets; guides; seals; piston rings; disc-pad braking system; forming dies; cutting tools Fretting wear Riveted joints, bolted flanges, shrink fits, all...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001486
EISBN: 978-1-62708-234-1
... firstly from the aspect of design, attention being given to methods of reducing the amplitude of the liner vibration. Piston slap can be reduced by minimizing the clearance, but attempts to reduce this too far could result in scuffing and increased wear. Other workers have suggested the use of a cam...
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
... thermoplastics surface damage thermosets wear PLASTICS (or polymers [1] ) are used in a variety of engineering and nonengineering applications where they are subjected to surface damage and wear. Examples of the tribological (involving sliding between two surfaces) use of plastics include gears and cams...
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
.... (a) Erosion damage on a butterfly valve component. (b) Fretting damage on a friction band. (c) Sliding wear on a cam follower The types of activities generally required for the resolutions of wear problems are: Examining and characterizing the tribosystem Characterizing and modeling the wear...
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
... of a recurrence. The failed part was the body or housing of a liquid 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...
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
... (arrow) that nucleated fracture. 6×. (c) Etch pits in surface. 100× Parts such as the one shown in Fig. 17(a) were used as grease-wiper springs for cams. The springs were formed from stampings of 0.25-mm (0.010-in.) thick carbon spring steel (0.65 to 0.80% C) and were hardened to HR15N 84...
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
.... A number of reciprocating hammer test rigs are in existence that use an impacter at the end of a lever arm moved up and down through a rotating cam ( Ref 36 , 52 , 53 , 54 ). A typical example is shown in Fig. 23 . Various mechanisms are employed to move the hammer up and down, including electromagnets...