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Experimental research on the mechanism of non-monotonic characteristic between curing temperature and mechanical behaviors of Kevlar/epoxy composite

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Science China(Technological Sciences) 2018年第7期61卷 1012-1020页

作者： LIU Li HU DeAn ZHANG YouMin HAN Xu State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Key Laboratory of Advanced Design and Simulation Technology for Special Equipments Ministry of Education Hunan University School of Mechanical Engineering Hebei University of Technology

An experimental procedure is conducted to investigate the mechanism of the non-monotonic characteristic between curing temperature and mechanical behaviors of the Kevlar/epoxy composite in macro and micro levels. Different specimens are fabricated at four different curing temperatures and tested with ±45° off-axis tensile loading on a universal test machine coupled with digital image correlation(DIC). Moreover, the environmental scanning electron microscope(sem) was used to obtain the micrographs and reveal their mechanism. The tested results show that the tensile mechanical behaviors are sensitive to the curing temperature and the relationship is non-monotonic. Also, as the temperature increases, the thicknesses of the specimens are significantly enlarged. By analyzing the sem micrographs of the matrix grooves in the damage zone and DIC strain contours, it is concluded that the non-monotonic relationship is dominated by the properties of the Kevlar/epoxy interfaces and deformation of the distorted fibers.

关键词： Kevlar/epoxy composite mechanical behavior digital image correlation sem micrograph non-monotonic character-istic distorted fiber

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Structural Features and Properties of the Vitreous Part of the System 50P2O5-25CaO-(25-x)Na2O-xCoO (with 0 ≤ x ≤ 25;mol%)

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Advances in Materials Physics and Chemistry 2021年第12期11卷 254-266页

作者： Brahim Bachachir Yassine Er-Rouissi Radouane Makhlouk Achraf Harrati Abdeslam El Bouari Said Aqdim Faculty of Sciences Ain Chock Laboratory of Materials Engineering for Environment and Valorization Hassan II University Casa-blanca Morocco Faculty of Sciences Ben-M’sik Laboratory Physical-Chemistry of Applied Materials Hassan II University Casablanca Morocco Department of Chemistry Faculty of Science Mineral Chemistry Laboratory Hassan II University Ain Chock Casablanca Morocco

The glass series 50P2O5-25CaO-(25-x)Na2O-xCoO (with (0 ≤ x ≤ 25;mol%), has been prepared by direct melting at 1080°C ± 20°C. The introduction of cobalt in calcium phosphate glasses is used to compare its effect with calcium in inhibition corrosion. The dissolution rate has been investigated. It indicated an improvement of chemical durability when the cobalt oxide increases in the network glass at the expense of Na2O content. Both, IR spectroscopy and X-ray diffraction have confirmed the structure changes when the CoO content increases in the glass. This change results in the disappeara

关键词： Chemical Durability Phosphate Glasses Cobalt Oxide Density DTA DRX IR sem micrograph

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