Advanced Materials Research Vols. 1004-1005

Abstract: This paper aims at studying the dynamic buckling characteristic of the fiber composite honeycomb under out-of-plane impact load. It was found that: with the increasing of the wall thickness, both the critical buckling load and the critical failure load of the composite honeycomb will decrease gradually. By increasing the wall aspect, the critical buckling load will decrease, while the critical failure load will increase. However, when the aspect reaches to 3.5,both the above two kinds of load are no longer sensitive to the variation of it.

Abstract: In this study, silvergrass (SV) reinforced high density polyethylene (HDPE) composites were prepared. The effects of slivergrass fibers (SV) content on the mechanical properties, crystalline properties of wood plastic composites (WPCs) before and after water absorption were investigated. It was found that compared with the untreated WPCs after immersed into water, the tensile strength of PMDI treated composites were higher. Silvergrass can be the nucleating agent with treated by PMDI. The X_c of PMDI treated WPCs after immersed into water was also increased. However, this improved X_c has negative effect on mechanical properties.

Abstract: Ti-Al alloy matrix self-lubricating composites were fabricated by the method of high temperature hot pressing sintering. The friction and wear performance of self-lubricating Ti-Al matrix composites were studied at high temperature. The study found that the friction coefficient decreased with the increase of solid lubricant, CaF2 and BaF2 had played good lubrication. when the lubricant BaF2-CaF2 mass fraction was 10%, the wear rate of composites to the lowest, it was 0.29×10⁻⁷ cm³N^-1m^-1 in 650°C high temperature.

Abstract: The XFEM was used to forecast the sub-interface crack propagation paths of carbon fiber reinforced composites, and the simulation results were compared with the SEM photos. The change of strain energy and damage dissipation energy in this process was also investigated. The results indicated that the existence of fiber had a certain influence on the crack propagation direction. And the structure energy changed along with the crack propagation.

Abstract: Introducing carbonyl nickel’s fine particles into a thermo-resistant polyamide phenylone can significantly improve thermo-physical characteristics of the CM and extend the operational temperature range of products made from these materials. Introducing carbonyl nickel in the amount of 5 – 20 mass %, thermo-resistance of phenylon C-1 increases by 10-30 degrees (most significantly in the case of a 20 % content), thermal conductivity grows by 38 %, and temperature conductivity of composite materials ranges from 1.75∙10-4 to 1.9∙10-4, which is 1.3 - 1.4 times as high as that of the initial phenylon.

Abstract: In this paper,the soybean protein / poly (ethylene terephthalate)PET composite fabric was obtained and its wearability was mainly studied. It is found that the moisture regain, water absorption, air permeability and moisture permeability of soybean protein PET composite fabric were improved greatly. In addition, the whiteness and elastic wrinkle recovery angle kept well, and the stiffness increased incredibly. Therefore, soybean protein being grafted on PET fabric surface not only improved the biocompatibility, but also the wearability.

Abstract: In order to select effective carbon black (CB) and matrix resin for fabricating semi-conductive shielding materials of XLPE insulated high voltage cable, the crosslinkable composites were prepared by melt blending different types of CB with three types of copolymer resin, and the crosslinking samples were compressed. The electrical conductivity, mechanical properties, thermal elongation properties and rheological properties of the crosslinkable semi-conductive composites were measured. The research results indicated that compared to EVA-based and EEA1-based composites, the EEA2-based composites have the lowest volume resistivity and the best rheological properties, and the CB content has less effect on their mechanical properties. The properties of the composites with CB1 were superior to that of the composites with CB2. The composites prepared with CB1 and EEA2 present the best overall properties. These composites are expected to be used in the manufacture of semi-conductive shielding layer for high voltage cable.

Abstract: Through a comprehensive analysis of a variety of new materials and new research status of the bridge structure，a new kind of lightweight emergency bridge structure is proposed, with CFRP cable-stayed cable, GFRP profiles tower, GFRP profiles girders and panels, assembled and erected section by section from one side to the other side. By optimizing design, the reasonable parameters of the new bridge structure structure was determined. From the perspective of the carrying capacity of the structure , the bridge feasibility is verified.

Abstract: Organic-inorganic hybrid block Poly (silane-b-arylacetylene) (PSbA) have been synthesized through condensation polymerization between chloro-terminated polysilane and diethynylbenzene Grignard reagent, and chloro-terminated polysilane was synthesized through condensation polymerization of dichloromethylvinylsilane in the presence of Mg metal and Lewis acid (ZnCl_2, LiCl). The structures of PSbAs were characterized by FTIR, ¹H, ¹³C, ²⁹Si NMR, and GPC. The PSbAs are orange viscous liquid and can be soluble in common organic solvents at room temperature. The thermal cure behavior of PSbAs was determined by DSC, and the thermal and oxidative stability of the cured PSbAs were investigated using TGA. The results showed that the cured PSbAs exhibit high thermal and thermooxidative stability. The degradation temperatures at 5% weight loss for the cured PSbAs are 470-533°C under N₂ and 378-456°C under air, and the residue yields at 1000°C are 77.9-82.8% under N₂ and 40.4-50.5% under air.

Abstract: In this paper, β''-alumina powders were prepared by solid-state synthesis method with different kinds of sodium compounds such as sodium carbonate, sodium bicarbonate, sodium oxalate, sodium acetate and sodium citrate. Each sodium compound was mixed with α-alumina by ball-milling, and then dried and calcined in muffle furnace, respectively. In order to confirm the superior condition for different sodium compound to prepare β''-alumina, original raw material with different powders molar ratio and calcination temperature were applied. The phase compositions of mixed powders after calcination were analyzed by X-ray diffraction (XRD). The results show that different kinds of sodium compounds which are just composed of sodium, carbon and oxygen all can be used as sodium source for preparing β''-alumina, but different sodium source compounds need different calcination temperature to form β''-alumina phase. And the molar ratio of sodium compound to α-alumina has an effect on the final content of β''-alumina.