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      저자 : Shahedifar Vahideh (검색결과 2 건)
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        Finite element simulation of mechanical properties of TaC-based core/graphite shell fibrous monolithic ceramics

        Mollaabbaszadeh Vahideh,Kakroudi Mahdi Ghassemi,Shahedifar Vahideh,Vafa Nasser Pourmohammadie 한국탄소학회 2024 Carbon Letters Vol.34 No.1

        This work utilizes the commercial finite element software ABAQUS to investigate the factors influencing the mechanical behavior of tantalum carbide (TaC)-based/graphite fibrous monolithic ceramics (FMCs), such as core/shell volume ratio and fiber orientation. The good compliance between experimental and simulated results demonstrates the suitability of the finite element software ABAQUS for exploring mechanical properties in FMCs. According to the results, it was observed that the bending strength of TaC-based/graphite FMC decreased with the change in fiber orientation from 0° to 90°. The displacement amount in the core/shell volume ratio of 75/25 (C75S25) sample with a fiber orientation of 90° was maximum (with a value of 0.0524 mm), indicating that crack propagation occurred later. Therefore, the sample exhibited better resistance to failure. Generally, C75S25 specimens started to crack later than the core/shell volume ratio of 65/35 (C65S35) in both fiber orientations and released more energy during crack initiation. Additionally, when the 0°-fiber-oriented specimen failed, more energy was released than the [90°] sample with the same core/shell volume ratio.

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        Influence of graphite platelets with and without SiC on the densification and fracture toughness of ZrB2 ceramic sintered by SPS

        Savari Valid,Balak Zohre,Shahedifar Vahideh 한국탄소학회 2022 Carbon Letters Vol.32 No.6

        Few studies have been performed on ZrB2-graphite platelet composite made by spark plasma sintering (SPS) technique. In this research, the influence of adding graphite platelets (Gp) with and without SiC on the fracture toughness of ZrB2 ceramic was studied. The ZrB2-10Gp, ZrB2-15Gp, ZrB2-30SiC-10Gp, and ZrB2-30SiC-15Gp specimens were sintered by the SPS method at the temperature of 1850 °C for 8 min. The fracture toughness and work of fracture (WOF) were evaluated using the Single-Edge Notched Beam (SENB) technique. It was found that the fracture toughness and WOF were improved by the alone and combined addition of Gp and SiC to the monolithic ZrB2. The maximum fracture toughness of 4.8 ± 0.1 MPa m1/2 was obtained for the ZrB2-15Gp specimen. It seems that adding Gp alone was more effective in enhancing the fracture toughness of ZrB2 than the combined addition of Gp and SiC. While the addition of Gp and SiC simultaneously modified the densification behavior to reach full-densified samples.

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