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indentation-induced cohesive cracking

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Series: ASM Handbook
Volume: 12
Publisher: ASM International
Published: 01 January 1987
DOI: 10.31399/asm.hb.v12.a0001831
EISBN: 978-1-62708-181-8
... declining-load portion of the fatigue cycle. This results in a compressive stress at the crack tip due to the relaxation of the residual elastic tensile stresses induced in the uncracked portion of the material during the rising load cycle ( Fig. 23b ). The closing crack does not reweld, because the new...
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
... illustrates a typical indentation formed in a ceramic coating subjected to repetitive impacting by a hardened steel ball. A central zone of cohesive failure exists in which cracking and coating delamination occurs. An intermediate zone is found between the central and peripheral regions on the internal side...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006792
EISBN: 978-1-62708-295-2
... FATIGUE (RCF) is a common failure mode in components subjected to rolling or rolling-sliding contact (e.g., rolling-element bearings, railway tracks, gears). It is characterized by crack propagation caused by the near-surface alternating shear stress field, caused by rolling or rolling-sliding contact...
Series: ASM Handbook
Volume: 5A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v05a.9781627081719
EISBN: 978-1-62708-171-9
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001282
EISBN: 978-1-62708-170-2
... to 1175 °C (1850 to 2150 °F) fusing temperatures. Fusing temperatures may alter the heat-treated properties of some alloys. However, the coating will usually withstand additional heat treatment of the substrate. Slower cooling rates may be required to reduce cracking where greater thicknesses are...
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
... generate combined fretting wear (i.e., wear volume induced by debris formation and debris ejection) but also fretting fatigue (i.e., crack nucleation and crack propagation) ( Ref 10 , 15 – 18 ). Fortunately, new surface treatments combining shot and laser peening with a thick self-lubricant plasma coating...
Series: ASM Handbook
Volume: 5B
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v05b.a0006026
EISBN: 978-1-62708-172-6
... surface. In both of these cases, the adhesive strength of a coating (the bond of the layers to one another and to the substrate) is being assessed. The inner strength of each coating layer or the cohesive strength of a coating (the ability of each layer to hold itself together) is also assessed. The...
Series: ASM Handbook
Volume: 12
Publisher: ASM International
Published: 01 January 1987
DOI: 10.31399/asm.hb.v12.a0001834
EISBN: 978-1-62708-181-8
... fractures, and high-temperature fractures. brittle fracture cold cracking deep-field microscopy ductile fracture embrittlement etching fatigue fracture fracture replica light microscopy macroscopic examination quality control taper sectioning visual inspection THE VISUAL EXAMINATION of...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006457
EISBN: 978-1-62708-190-0
... stress raiser that may generate a metal crack during service. On the other hand, gouges are blunt linear indentations in the adherend surface. Deep gouges, like scratches, are generally unacceptable. The most prominent defects found or generated in honeycomb sandwich assemblies are summarized in...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.9781627081955
EISBN: 978-1-62708-195-5
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006791
EISBN: 978-1-62708-295-2
... , galling , scoring , and scuffing . Adhesive wear occurs because the adhesive bond is stronger than the cohesive bond within the weaker material of the contact pair ( Ref 5 ). Even though a contact surface may seem smooth, it actually consists of many valleys and asperities, so-called “high spots.” The...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001280
EISBN: 978-1-62708-170-2
.... Complex shapes can be coated by the fluidized-bed process. With special techniques, inside surfaces of long small-diameter closed-end tubes can be coated. However, coatings will form only on edges with a radius of 0.125 mm (0.005 in.) or more. Cracks around rivet heads and joints between sheets cannot...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001277
EISBN: 978-1-62708-170-2
..., paints are available that contain special pigments to provide conductivity suitable for grounding induced or static electricity. Paints have been developed to meet newer environmental regulations. The general terms “paint” and “organic coating” are essentially interchangeable and are used to...