Applied Mechanics and Materials Vols. 633-634

Abstract: Based on a certain type of aircraft structure repair adhesive was studied, the curing temperature of aircraft structure repair commonly used adhesive process of high, long curing time, curing thermal stress problem, with epoxy resin as basic material, by adding elastic toughening Ding Jin g rubber, curing agent and silane coupling agent modification on Toughening of epoxy resin. The mechanical properties of adhesive were analyzed through the cyclic loading test and tensile shear test, and the best ratio of modified epoxy resin adhesive. The adhesive prepared at 80 °C for 90 min after curing shear strength can reach 35MPa, which can meet the aircraft structure damage daily emergency repair requirements.

Abstract: According to the Hypersonic Vehicle harsh environment, impacts of temperature on the mechanical properties for functionally gradient materials are studied. A power-law distribution of material is applied between the two pure materials; a material property model of FGMs is built. Several temperature conditions are set up and the results are obtained in the end through numerical analysis. It can be shown that the material properties of FGMs plate are temperature-dependent and vary along the thickness in terms of volume fractions of constituents.

Abstract: High-calcium MgO-CaO refractories were prepared using light burned dolomite as the main starting material, high activity MgO powders from magnesite decomposition products as the additive, to study the influence of high activity MgO powders on the sintering behavior and hydration resistance of MgO-CaO refractories. Then the mineral phases were analyzed by X-ray diffraction (XRD) and the crystal bonding mechanism was analyzed by scanning electron microscopy (SEM). The results show that: 1) The sintering properties of MgO-CaO materials were effectively improved and the sintering temperature was reduced. 2) The high activity MgO powders formed coating layers on the surface of CaO grains, which can effectively reduce the hydration effect of CaO. Thus the hydration resistance of MgO-CaO refractories was improved.

Abstract: Multi-walled carbon nanotubes (MWCNTs) modified carbon fibers-reinforced polymer (CFRP) composites was prepared used the MWCNTs/CFs hybrid fibers as reinforcement, MWCNTs modified epoxy resin as matrix material. Subsequently, the MWCNTs modified CFRP were subjected to low-energy impact and directly compared with the unmodified ones to investigate the influence of adding MWCNTs on the impact and after-impact behavior of CFRP composites. In terms of the impact performance, MWCNTs modified CFRP composites was observed for a little higher energy absorb than the reference CFRP. The damage area of MWCNTs modified CFRP less than that of reference CFRP's, which means the addition of MWCNTs plays an important role in preventing crack spread. Moreover, the after-impact properties were improved for both the compression modulus and the compression strength.

Abstract: Science and technology are the products of human understanding and the remaking of nature. Technological innovation is an important way for a country or an industry to achieve better development. Nanotechnology, representative of new materials technology in general, has permeated every aspect of our lives, and plays an especially important role in competitive sports. With this rapid development of new technologies and materials foremost in mind, this paper describes the application of new technologies and new materials in the sports industry.Science and technology are primary productive forces. In modern society, technological innovation permeates every aspect of human life, and is closely related to the quality of life of modern people. In addition, spectator sports, competitive sports, sports science and technology, R&D (research and development) and innovation in general are also invariably affected, particularly by the rapid development of new technology materials.

Abstract: Abstract: A form of static coupon following the boat was developed to carry the natural aging test for CF3011/BA9916-II composite in marine environment, and the weather resistance of composite in marine climate was studied. The changes of the morphology of the composite were observed, the changes of the quality ,tensile strength and interlaminar shear strength for specimen were analyzed, and the aging regulation was studied combining with the mechanism of hygrothermal aging for carbon fiber epoxy composite. The test results showed that with the aging time increasing, the moisture absorption of the composite increased, the mechanical strength decreased , and the plastic behavior of the material was showed.

Abstract: Diatomite was treated by titanate coupling agent and blended with low-density polyethylene (LDPE) by the method of melt-mixing blend. The performance of the blends, such as thermal behavior, mechanical property and microstructure, were analyzed with differential scanning calorimetry, thermo-gravimetric analysis, tensile strength testing and scanning electron microscopy. The results showed that influenced the crystalline behavior of LDPE phase in the blends and made the crystallization rate of LDPE phase decreased. Moreover, the thermo-decomposing temperature of the blends increased with increasing the diatomite content, diatomite significantly improved the thermal stability of the blends. Tensile strengths of the blends firstly decreased and then increased. When the diatomite content was 30%wt, the tensile strength of the blend reached to 14.6MPa. SEM photographs showed the good dispersion and interaction.

Abstract: The compact MFI membrane supported on a mesoporous-layer-modified macroporous Al₂O₃ substrate has been prepared by the secondary growth method. SEM images indicate that the MFI membranes with the thickness of ca. 15 μm consist of highly intergrown crystals with remarkable integrity. The H₂ permeance of MFI membranes on mesoporous/macroporous substrate is 8-18 times larger than that on the macroporous substrate, and further the permselectivity of H₂/C₃H₈ maintains at the level of 20, which is 4 times higher than that of the corresponding Knudsen diffusion. More importantly, the real selectivity of the mixture of H₂/C₃H₈ on these membranes is 2-4 times higher than that of the corresponding Knudsen diffusion. The method is attractive for the practical application.

Abstract: TiAl based micro-laminated sheet was deposited by electron beam physical vapor deposition (EB-PVD) with dual-target in this work, and then the microstructure and phase analysis of as-deposited samples were studied by SEM, XRD and TEM. The results show that the difference of melting points between Ti and Al led to the distinctive structure: the Ti-Al layers were mainly constituted of equiaxed grains and Ti layers were constituted of column grains. Because of the deviation of saturated vapor pressure between Ti and Al element, the component showed a gradient change periodically along the normal direction of Ti-Al layers and results in several sub-layers. The Ti layers, Ti-Al layers and interfacial layers were constituted of α phase, γ+α₂ phase and α₂ phase respectively.

Abstract: Fumed silica /High density Polyethylene (HDPE) composites were prepared via melt mixing using a two –screw co-rotating extruder. To improve the dispersion degree of the fumed silica, the γ-aminopropyl triethoxy silane (KH-550) was used as silane coupling agent. The composites which obstained different fumed silica content were prepared by melt-mixing process. Next composites mechanical properties were measured by the crystal polarized light microscopy (PLM), Shore hardness, the tensile testing. The results indicate that fumed silica can enhance HDPE resin and the mechanical properties of composites are optimum when fumed silica content is 3.0 wt%.