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Fractography

About: Fractography is a research topic. Over the lifetime, 5043 publications have been published within this topic receiving 86068 citations.


Papers
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Journal ArticleDOI
TL;DR: In this paper, the results of selective laser melting (SLM) processing of in situ Ti-TiB composites from optimally milled titanium diboride (TiB 2 ) powder were presented.

455 citations

Journal ArticleDOI
TL;DR: In this paper, the micromechanics involved in increased crack growth resistance, due to the addition of TiB2 particulate in a SiC matrix was analyzed both experimentally and theoretically.
Abstract: The micromechanics involved in increased crack growth resistance, KR, due to the addition of TiB2 particulate in a SiC matrix was analyzed both experimentally and theoretically. The fractography evidence, in which, the advancing crack was attracted to adjacent particulates, was attributed to the tensile region surrounding a particulate. Countering this effect is the compressive thermal residual stress, which results in the toughening of the composite, in the matrix. This thermal residual stress field in a particulate-reinforced ceramic-matrix composite is induced by the mismatch in the coefficients of thermal expansion of the matrix and the particulate when the composite is cooled from the processing to room temperature. The increase in KR of the composite over the monolithic matrix, which was measured by using a hybrid experimental-numerical analysis, was 77%, and compared well with the analytically predicted increase of 52%. The increase in KR predicted by the crack deflection model was 14%. Dependence of KR on the volume fraction of particulates, fp, and of voids, fv, is also discussed.

441 citations

Journal ArticleDOI
TL;DR: In this article, the effect of adding carboxy-terminated butadiene-acrylonitrile (CTBN) elastomer to a piperidine/bisphenol A diglycidyl ether (A) resin was investigated.
Abstract: The fracture behavior of a piperidine/bisphenol A diglycidyl ether (A) resin has been determined in bulk and as an adhesive using the linear elastic fracture methods developed by Mostovoy1. The effect of adding carboxy-terminated butadiene–acrylonitrile (CTBN) elastomer to resin A was investigated. The opening-mode fracture energy () of resin A was 120 to 150 J/m2, and largely attributable to plastic deformation. Fractographic evidence was obtained for plastic flow at the crack tip during crack initiation. Propagation was unstable due to the rate dependence of the plasticity. There were no significant differences in the bulk and adhesive fracture behavior. Addition of 5–15% CTBN to resin A produced minute elastomer particles which increased to ∼4000J/m2 (at 15%). Further CTBN addition resulted in an elastomer–epoxy blend and a decrease in fracture energy. Fractography again indicated that crack initiation involved plastic deformation but that the elastomer had greatly increased the volume in which the deformation occurred. The adhesive fracture of the elastomer–epoxy was found to be strongly dependent on the crack-tip deformation zone size (ryc) in that was a maximum when bond thickness was equal to 2 ryc. At bond thicknesses less than 2 ryc, there was a restraint on the development of the plastic zone resulting in lower values.

440 citations

Journal ArticleDOI
TL;DR: In this paper, the relative importance of these mechanisms for different fracture modes and materials are discussed based on detailed fractographic observations and critical experiments, and the evidence supporting various hypotheses, such as those based on hydride formation, hydrogenenhanced decohesion, hydrogen-enhanced localised plasticity, adsorption-induced dislocation emission, and hydrogen-vacancy interactions, are summarised.
Abstract: Abstract Mechanisms of hydrogen embrittlement in steels and other materials are described, and the evidence supporting various hypotheses, such as those based on hydride formation, hydrogen-enhanced decohesion, hydrogen-enhanced localised plasticity, adsorption-induced dislocation emission, and hydrogen-vacancy interactions, are summarised. The relative importance of these mechanisms for different fracture modes and materials are discussed based on detailed fractographic observations and critical experiments.

439 citations

Book
01 Sep 1999
TL;DR: In this paper, the concepts used in the observation, measurement and interpretation of fracture surface topography have been discussed, including mirror, mist and hackle: surface roughness, crack velocity and dynamic stress intensity.
Abstract: 1. Introduction to the concepts used in the observation, measurement and interpretation of fracture surface topography 2. Observing, describing and measuring fracture surface topography: some basics using Ketton stone as an example 3. Tilting cracks 4. River line patterns 5. Mirror, mist and hackle: surface roughness, crack velocity and dynamic stress intensity 6. Cleavage of crystalline solids 7. Fracture at interfaces 8. Aspects of ductile fracture 9. Crack dynamic effects 10. Applications of fractography Appendix.

397 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023120
2022254
2021229
2020206
2019205
2018176