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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c0090454
EISBN: 978-1-62708-220-4
...Abstract Abstract A chemical storage vessel failed while in service. The failure occurred as cracking through the vessel wall, resulting in leakage of the fluid. The tank had been molded from a high-density polyethylene (HDPE) resin. The material held within the vessel was an aromatic...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001629
EISBN: 978-1-62708-235-8
... Representative copper parts. Tinting is evident. Representative nondiscolored and discolored parts were evaluated to characterize any discernible differences and to determine the nature and cause of the discoloration. Several processing substances, including cutting fluid, two different coolants...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006795
EISBN: 978-1-62708-295-2
... into the characteristic (for given erosive conditions) material surface occurs, including removal of chemicals (e.g., lubricants and cutting fluids remaining after production), a change of topography (removal of grinding marks, etc.), removal of fragments weakened or damaged during the production stage, generation...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003549
EISBN: 978-1-62708-180-1
... of a deposit removed from a fracture surface that experienced stress corrosion may not reveal the corrodent that caused the SCC. Often the fracture surface is flushed with water or cleaned prior to testing. Liquid penetrants, cleaning fluids, cutting fluids, and solvents may alter the chemical composition...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003568
EISBN: 978-1-62708-180-1
... is the progressive loss of original material from a solid surface due to mechanical interaction between that surface and a fluid, a multicomponent fluid, an impinging liquid, or impinging solid particles ( Ref 1 ). Erosion is a rather broad term and can be further classified into a number of more specific terms...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006782
EISBN: 978-1-62708-295-2
... water systems to treat for MIC. Stirring a tank of fluid could be all that is required to avoid pitting corrosion. Following the analysis of corrosion failures, corrective actions are recommended to prevent or delay the recurrence of failures. Approaches to corrective and preventive actions include...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001798
EISBN: 978-1-62708-241-9
... from damage by shock, humidity, salt fog, mold, and so on [ 1 – 3 ]. The cured epoxy resin is usually very stable during service. However, an epoxy resin encapsulant on an electromagnetic valve coil has become soft, even turning into fluid after 14 years of storage. The failed encapsulant, including...
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
... (loose particles between surfaces) Stress level High stress or low stress Surface alteration Scratching, polishing, or gouging Presence of fluid Dry abrasion or slurry abrasion (particles in fluid) Relative hardness of particles to surface Surface harder or softer than particles...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.med.c9001664
EISBN: 978-1-62708-226-6
... of surface deposit which formed a typical “mud crack” pattern. Cleaning in acetone in an ultrasonic cleaner loosened some of this material, though most of it was very tenacious. It may be a corrosion product from reaction with body fluids, or a dried body fluid deposit. Fig. 5 Scanning electron...
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
... crew observed hydraulic fluid spraying from the top of the aircraft. The aircraft was then grounded for complete evaluation of hydraulic system integrity. Non-destructive inspection of main rotor head components revealed the presence of a through thickness crack along the leading edge of the grip...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003522
EISBN: 978-1-62708-180-1
.... This information needs to be recorded before any parts are cut from the component of interest. A considerable amount of information can be obtained from observation of the direction and sequence in which cracking has occurred. For example, where cracks meet, as illustrated in Fig. 1 , it is apparent that crack “B...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006757
EISBN: 978-1-62708-295-2
..., ceramics are wet-cut (water or a special cutting fluid) with a rotating diamond cutting wheel on a bench-type laboratory machine or on a precision cutting machine. The cutting speed (25 to 500 rpm for a low-speed cutting machine; 500 to 5000 rpm for a high-speed cutting machine) and the cutting pressure...
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
... in a laboratory, the requirements for on-site testing may involve the use of portable laboratories with metallographic equipment for grinding, mechanical polishing, and etching. Small specimens can be cut from a part on the site for preparation, examination, and photography immediately or upon return to a fully...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001314
EISBN: 978-1-62708-215-0
... of the horizontal axis coils. Visual examination of the inside of the tubing indicated the presence of a carbonaceous deposit resulting from decomposition of the heat-exchanging fluid. Subsequent metallographic examination and microhardness testing indicated that the steel was heated to a temperature above...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0048791
EISBN: 978-1-62708-234-1
... of the unused cross was visually inspected. It consisted of about a 180-mm (7-in.) square that had a maximum thickness of 60 mm (2.37 in.). It included a weld-preparation area that was about 16 mm (0.625 in.) thick. One side of the specimen had been flame cut, while the other had been sawed. The outside surface...
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
... important to highlight that engine syntetic lubricating fluid looses properties and begins to release carbon deposits in the range of 230 ÷ 250°C. Neither carboned deposits nor burnt oil film were detected during visual examination of the frozen components. On the other hand, thermal discoloration...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006785
EISBN: 978-1-62708-295-2
... of the component. Removal should be performed by mechanical cutting rather than through the use of heat (such as torch cutting), and care should be taken during the removal process so that the surface features of interest are not damaged and any corrosion product present is not contaminated with cutting fluid...
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
... processes and relevant tribosystems Table 1 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...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001634
EISBN: 978-1-62708-221-1
...Abstract Abstract The boom lift equalizer hose on an excavator failed and the resultant release of high-pressure hydraulic fluid damaged the operator cabin. The hose was a heavy duty, high-impulse, multiple-spiral wire-reinforced, rubber covered hydraulic hose equivalent to 100R13...
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...