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damage rate

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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
...Abstract Abstract This article describes three design-life methods or philosophies of fatigue, namely, infinite-life, finite-life, and damage tolerant. It outlines the three stages in the process of fatigue fracture: the initial fatigue damage leading to crack initiation, progressive cyclic...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001788
EISBN: 978-1-62708-241-9
...Abstract Abstract Several failed dies were analyzed and the results were used to evaluate fatigue damage models that have been developed to predict die life and aid in design and process optimization. The dies used in the investigation were made of H13 steels and fractured during the hot...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001013
EISBN: 978-1-62708-234-1
...Abstract Abstract A wall section of a carbon steel choke body in gas service at 4400 psig blew out three months after the use of a corrosion inhibitor was stopped. Corrosion damage occurred in ripples, leaving both smoothly polished and unattacked areas. The corrodent in condensate wells...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001810
EISBN: 978-1-62708-180-1
...Abstract Abstract Rolling-element bearings use rolling elements interposed between two raceways, and relative motion is permitted by the rotation of these elements. This article presents an overview of bearing materials, bearing-load ratings, and an examination of failed bearings. Rolling...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c9001438
EISBN: 978-1-62708-224-2
...Abstract Abstract A crane hook of 200T rated capacity failed suddenly at an indicated load of 143T, while the crane was undergoing a load test. Fracture took place through the intrados of the hook at the region of maximum stress. The jib and other portions suffered subsequent damage following...
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
..., and/or changes 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...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001723
EISBN: 978-1-62708-221-1
... of the jib (rated capacity 4 tons) was in the process of being slewed at the time of this failure. Inspection revealed that the collapse had resulted from the opening out of one eye of the rimming steel tie-bar of the main jib at the lower splice. This permitted the pin to pass through and allowed the jib...
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
... concentrated as the water evaporates under the influence of the dry region. The damage caused by the long term bombardment of liquid droplets does not typically proceed at a uniform rate even if the liquid impingement is uniform with time [ 17 ]. There is an initial phase during which there is usually some...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003570
EISBN: 978-1-62708-180-1
...-based fatigue ( Ref 10 ), damage rates in cavitation erosion and liquid-droplet erosion correlated very well with cyclic deformation properties ( Ref 8 ). The main determinant of erosion resistance is the fatigue strength coefficient, σ f ′ , which is a measure of cyclic stress resistance...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006804
EISBN: 978-1-62708-329-4
... and heat damage indicators. If anything is rated as damaged, further assessment is needed, as described in API 579-1/ASME FFS-1 ( Ref 4 ). Level 2 entails performing dimensional or metallurgical assessments. In many circumstances, it refers FFS practitioners to other parts of the standard. Level 3...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006794
EISBN: 978-1-62708-295-2
... heterogeneously strained regions. The strained and unstrained or less strained regions can cause a local galvanic effect and thus promote corrosion. Destroyed or damaged passive film also results in local anodic and cathodic regions, leading to a higher corrosion rate. Surface roughening assists corrosion...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006807
EISBN: 978-1-62708-329-4
... the assumption that creep damage results from an effective loss in material cross section due to internal voids and contains only one damage parameter, ω, defined as: (Eq 9) ω = 1 − A A 0 where A 0 is the original cross-sectional area, and A is the remaining effective area. The creep-rate...
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
... condition had not been included in the rotor hub design safe-life analysis. Accordingly, GKNW developed an MPOG load model to estimate the fatigue damage rate of the rotor hub owing to this load condition. 13 Several assumptions were made about operation of the RNLN Lynx helicopters. A notable...
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
... rates in other fluids. The amount of erosion damage to a specimen rises to a maximum as the distance between the specimen and the vibrating surface decreases. At a frequency of 20 kHz, the position that results in maximum erosion rates is approximately 0.5 mm (0.02 in.) from the vibrating surface...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006829
EISBN: 978-1-62708-295-2
... Fig. 1 Example of fretting and related visible imprint on the main bearing shell. Adapted from Ref 10 . Reprinted with permission from MAN Energy Solutions Fig. 2 Fatigue crack generated by fretting damage in a rivet hole and fastened assemblies. Bottom two images reprinted from...
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
... under constant-load testing (curve A) and constant-stress testing (curve B). (b) Relationship of strain rate, or creep rate, and time during a constant-load creep test. The minimum creep rate is attained during second-stage creep Fig. 1 Creep damage (bowing) of a cobalt-base alloy turbine vane...
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
... the rate of damage. Erosion by fly ash causes polishing, flat spots, wall thinning, and eventual tube rupture. Fly-ash erosion can be controlled by coating tube surfaces with refractory cements or other hard, wear-resistant materials, although this reduces the heat-transfer capability of the surface...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006780
EISBN: 978-1-62708-295-2
... turbine engines Oxide-dispersion-strengthened nickel-base alloys 1350–1400 0.55–0.65 Correlation of damage level and life fraction consumed Table 3 Correlation of damage level and life fraction consumed Damage level Consumed life fraction range X Remaining life factor (1/ X...
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
... increasing the rate of damage. Erosion by fly ash causes polishing, flat spots, wall thinning, and eventual tube rupture. Fly ash erosion can be controlled by coating tube surfaces with refractory cements and other hard, erosion-resistant materials, although this reduces the heat-transfer capability...
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
... rates of oxygen diffusion and could also promote local corrosion. Microscopical examination of sections cut from pitted regions of liners affected by cavitation damage show that the relatively mechanically weak phosphide eutectic is often left proud, in the pits. The examination of several pits...