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      Effect of the Characteristic Size and Content of Graphene on the Crack Propagation Path of Alumina/Graphene Composite Ceramics

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          Abstract

          In this paper, the Voronoimosaic model and the cohesive element method were used to simulate crack propagation in the microstructure of alumina/graphene composite ceramic tool materials. The effects of graphene characteristic size and volume content on the crack propagation behavior of microstructure model of alumina/graphene composite ceramics under different interfacial bonding strength were studied. When the phase interface is weak, the average energy release rate is the highest as the short diameter of graphene is 10–50 nm and the long diameter is 1600–2000 nm. When the phase interface is strong, the average energy release rate is the highest as the short diameter of graphene is 50–100 nm and the long diameter is 800–1200 nm. When the volume content of graphene is 0.50 vol.%, the average energy release rate reaches the maximum. When the velocity load is 0.005 m s −1, the simulation result is convergent. It is proven that the simulation results are in good agreement with the experimental phenomena.

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          Most cited references36

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          Large-scale 3D random polycrystals for the finite element method: Generation, meshing and remeshing

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            Toughening in graphene ceramic composites.

            The majority of work in graphene nanocomposites has focused on polymer matrices. Here we report for the first time the use of graphene to enhance the toughness of bulk silicon nitride ceramics. Ceramics are ideally suited for high-temperature applications but suffer from poor toughness. Our approach uses graphene platelets (GPL) that are homogeneously dispersed with silicon nitride particles and densified, at ∼1650 °C, using spark plasma sintering. The sintering parameters are selected to enable the GPL to survive the harsh processing environment, as confirmed by Raman spectroscopy. We find that the ceramic's fracture toughness increases by up to ∼235% (from ∼2.8 to ∼6.6 MPa·m(1/2)) at ∼1.5% GPL volume fraction. Most interestingly, novel toughening mechanisms were observed that show GPL wrapping and anchoring themselves around individual ceramic grains to resist sheet pullout. The resulting cage-like graphene structures that encapsulate the individual grains were observed to deflect propagating cracks in not just two but three dimensions.
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              Graphene-based nanocomposites and their fabrication, mechanical properties and applications

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                Author and article information

                Contributors
                Role: Academic Editor
                Journal
                Materials (Basel)
                Materials (Basel)
                materials
                Materials
                MDPI
                1996-1944
                28 January 2021
                February 2021
                : 14
                : 3
                : 611
                Affiliations
                [1 ]School of Mechanical and Automotive Engineering, Qilu University of Technology (Shandong Academyof Sciences), Jinan 250353, China; benshuaichen@ 123456163.com (B.C.); new-raul@ 123456163.com (M.Y.); zjj@ 123456qlu.edu.cn (J.Z.); zhoutingting506@ 123456163.com (T.Z.); czq@ 123456qlu.edu.cn (Z.C.); researcher_cbs@ 123456163.com (Y.Z.); xch@ 123456qlu.edu.cn (C.X.)
                [2 ]Key Laboratory of Advanced Manufacturing and Measurement and Control Technology for Light Industry in Universities of Shandong, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China
                Author notes
                [* ]Correspondence: xgc@ 123456qlu.edu.cn
                Author information
                https://orcid.org/0000-0003-3380-3689
                https://orcid.org/0000-0001-6816-4325
                Article
                materials-14-00611
                10.3390/ma14030611
                7865948
                33525747
                4665b8ee-4908-4b08-9e75-d5adf22ecab2
                © 2021 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                : 04 January 2021
                : 25 January 2021
                Categories
                Article

                graphene,composite ceramic tool material,crack propagation,toughening mechanism

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