Topic
Fracture toughness
About: Fracture toughness is a research topic. Over the lifetime, 39642 publications have been published within this topic receiving 854338 citations.
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TL;DR: In this article, an amphiphilic poly(ethylene-altpropylene)-b-poly (ethylene oxide) block copolymer (BCP) was blended with a bisphenol A-based epoxy resin formulation and self-assembled into a wormlike micelle structure.
Abstract: An amphiphilic poly(ethylene-alt-propylene)-b-poly(ethylene oxide) (PEP-PEO) block copolymer (BCP) was blended with a bisphenol A-based epoxy resin formulation and self-assembled into a wormlike micelle structure. With an incorporation of 5 wt % of the BCP material, the fracture toughness was improved by >100% over the neat epoxy. The morphology and mechanical properties of this BCP-modified epoxy were investigated using transmission electron microscopy, dynamic mechanical analysis, tensile tests, and fracture toughness measurements. Toughening mechanisms from the wormlike micelle-modified material were investigated using the double-notch four-point-bending technique, and the results are compared with data obtained from the same epoxy thermoset formulation containing a BCP that self-assembled into spherical micelles. Elongated cylindrical micelles produce improved toughness, which is interpreted on the basis of a combination of mechanisms including crack tip blunting, cavitation, particle debonding, limit...
192 citations
TL;DR: A comprehensive review of the phase stability, point defects, and fracture toughness of AB 2 Laves phases, and on the alloy design of dual-phase alloys based on a soft Cr solid solution reinforced with hard X Cr 2 second phases (where X = Nb, Ta and Zr) is provided in this paper.
192 citations
TL;DR: In this article, the authors describe the mechanical properties of carbon nanotube-reinforced Al2O3 nanocomposites fabricated by hot-pressing and show that the fracture toughness, hardness and flexural strength of the nanocomposition were improved by 94%, 13% and 6.4% respectively, at 4-vol.% CNT additions.
Abstract: This paper describes the mechanical properties of carbon nanotube-reinforced Al2O3 nanocomposites fabricated by hot-pressing. The results showed that compared with monolithic Al2O3 the fracture toughness, hardness and flexural strength of the nanocomposites were improved by 94%, 13% and 6.4% respectively, at 4 vol.% CNT additions. For 10 vol.% CNT additions, with the exception of the fracture toughness, which was improved by 66%, a decrease in mechanical properties was observed when compared with those for monolithic Al2O3. The toughening mechanism is discussed, which is due to the uniform dispersion of CNTs within the matrix, adequate densification, and proper CNT/matrix interfacial connections.
192 citations
TL;DR: In this paper, the elastic and mechanical properties of Stoichiometric polycrystalline magnesium aluminum spinel have been studied from room temperature up to 1300deg;C. Elastic modulus, fracture toughness, and modulus of rupture measurements and observations of polished and fracture surfaces have been performed.
Abstract: The elastic and mechanical behavior, from room temperature up to 1300deg;C, of Stoichiometric polycrystalline magnesium aluminum spinel is studied. Elastic modulus, fracture toughness, and modulus of rupture measurements and observations of polished and fracture surfaces have been performed. Two well-differentiated regions of fracture behavior as a function of temperature have been found. In the low-temperature region, this material behaves elastically, whereas in the high-temperature (>800deg;C) region, plastic phenomena take place.
192 citations
192 citations