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cumulative damage

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0048318
EISBN: 978-1-62708-234-1
... that water contained in the tube during shutdowns had accumulated and cumulative damage due to oxygen pitting resulted in perforation of one of the tubes. Filling the system with condensate or with treated boiler water was suggested as a corrective action. Alkalinity was suggested to be maintained at a pH...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001904
EISBN: 978-1-62708-217-4
... 10,000 h. Cumulative damage resulting from a previous accident could have occurred too. Because of this accident, inspectors were instructed to examine threaded zones of eyebolts by magnetic particle inspection after every 100 h in service. A maraging steel drive shaft of a helicopter also failed because...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001472
EISBN: 978-1-62708-221-1
... Abstract Severe damage to the jib of a dragline excavator resulted from failure of the shaft which carried the derricking sheaves at the apex of the "A" frame. Failure occurred within the hub of the center sheave of the group of three at the right-hand end of the shaft. The shaft...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001902
EISBN: 978-1-62708-217-4
... SAE 6150 spring steel, Canada's cold weather which may have had an embrittling effect on the steel, and cumulative fatigue damage from severe landing loads during service life. Replacement with heavier-duty spring legs will probably not eliminate this type of failure, but their use has reduced...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001363
EISBN: 978-1-62708-215-0
... in a bearing can cause the race to spall, which roughens the ball path and introduces debris into the bearing. This can eventually lead to smearing of the balls and to heat generation. An analysis was conducted to determine the cumulative fatigue damage that the bearing pair sustained over its operational life...
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
... of mean stress. Fig. 2 S-N curve for unnotched 2024-T4 aluminum alloy bar. Source: Ref 2 Variable-Amplitude Loading and Cumulative Damage While constant-amplitude loading is useful for defining fatigue properties and comparing test data, variable-amplitude loading, such as that shown...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001143
EISBN: 978-1-62708-229-7
... corrosion is the term given to corrosion that occurs in the presence of static stresses in which the damage exceeds the cumulative damage expected from the two mechanisms acting separately. Stress corrosion cracks may be either transgranular or intergranular [ 12 ]. The bulk of experimental evidence...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001754
EISBN: 978-1-62708-241-9
... to spalling and cumulative material transfer ( Fig. 7 ). Although the raceway was essentially obliterated, an attempt was made to examine a less-damaged spalled region with a scanning electron microscope (SEM). The high magnification observations did not provide remarkable results, confirming only what...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0090030
EISBN: 978-1-62708-217-4
... the bore emanating from a hard alpha (HA) defect. Such defects can result from occasional upsets during the vacuum melting of titanium. These nitrogen-rich alpha titanium anomalies are brittle and often have associated microcracks and microvoids. A probabilistic damage tolerance approach was recommended...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003569
EISBN: 978-1-62708-180-1
... damage may occur when surfaces in contact with fluid are subjected to vibrations (e.g., water-cooled diesel-engine cylinder liner). Sometimes, cavitation can initiate other types of wear such as adhesion or abrasion because of wear particles produced at the friction interface, making the failure analysis...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c0089572
EISBN: 978-1-62708-218-1
... that were formed before the castings were heat treated. Recommendations included the following changes in processing: better gating and risering in the foundry to achieve sounder castings; better shakeout practice to avoid mechanical damage; better inspection to detect imperfections; and normalizing...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001848
EISBN: 978-1-62708-241-9
... Abstract A forging die in a 250-ton press producing brass valves began to show signs of fatigue after a few thousand hits. By the time it reached 30,000 hits, the die was badly damaged and was submitted for analysis along with one of the last forgings produced. The investigation included visual...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c9001149
EISBN: 978-1-62708-232-7
... which converge into a single duct. The gases pass through the duct to a spark box, then through loop coolers to the baghouse. There, particulate material is removed from the gas which is then vented to the atmosphere. Fig. 1 North duct viewed from just north of baghouse. Damaged south duct can...
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
.... Vibrations, noises, uneven running, or even entire break-up of the equipment by spalling of materials may occur as a result of the cumulative effect of damage in the material due to repeated rolling contact loadings. In the previously published articles, rolling contact fatigue is classified into two...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001569
EISBN: 978-1-62708-229-7
... in maintenance. Nondestructive inspections by visual, magnetic particle, ultrasonic, and radiographic methods for detecting and monitoring damage are discussed. These failures are presented to provide hindsight that will help others in increasing the success rate for anticipating and analyzing the remaining life...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001636
EISBN: 978-1-62708-217-4
... in the M6 full-scale test ( Table 3 ); and it will be recalled that the choice of level 3 to represent S a,mfo is a key assumption for the method I estimate of service stresses for the M323 service failure. Using the well-known Palmgren-Miner cumulative damage hypothesis, also used in the original safe...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003545
EISBN: 978-1-62708-180-1
... cycles, reduced power operation, thermal gradients, and other factors result in variations in stresses and temperatures. Therefore, damage rule procedures are used to estimate cumulative damage under changing exposure conditions. In addition, creep behavior can depart from classical creep curves even...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003512
EISBN: 978-1-62708-180-1
... to exhaustion of life, thus leading to failure. Damage may be defined as a “progressive and cumulative change acting to degrade the structural performance of the load-bearing component or components which make up the plant” ( Ref 2 ). Life may be defined as the “period during which a component can perform its...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003517
EISBN: 978-1-62708-180-1
.... Damage may be defined as a “progressive and cumulative change acting to degrade the structural performance of the load-bearing component or components that make up the plant” ( Ref 1 ). Life may be defined as the “period during which a component can perform its intended function safely, reliably...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006802
EISBN: 978-1-62708-329-4
... of life, thus leading to failure. Damage may be defined as a “progressive and cumulative change acting to degrade the structural performance of the load-bearing component or components which make up the plant” ( Ref 2 ). Life may be defined as the “period during which a component can perform its intended...