Applied Mechanics and Materials Vols. 513-517

Abstract: The effect of Y addition on the hardness and wear properties of Ni-Mn-Ga magnetic shape memory alloys is researched by means of dry sliding test and Scanning Electron Microscope (SEM) in the paper. The results show that Y addition makes Ni-Mn-Ga alloys become harder, and the hardness of Ni-Mn-Ga shape memory alloys increases with Y content increasing. Adding Y improves the dry-gliding wear property of Ni-Mn-Ga alloy. Main abrasive wear mechanism is observed in Ni-MnGa-Y alloy.

Abstract: In this paper we analysed application status and reasons of recycled paper, researched physical properties, mechanical properties, optical properties, chemical properties and printing adaptability of recycled paper and tested the important indexes . The test data was compared with ordinary offset paper and there is little difference. The result shows recycled paper can be wildly used for offices, book, paper toys etc.

Abstract: A series of pseudo-static tests were conducted with 4 coupling beams whose span-depth ratio 1.2. Common reinforced concrete and PVA fiber reinforced concrete were used for different specimens. In each of the specimens, there were longitudinal reinforcement, constructional reinforcement and stirrup, one of the specimens had crossed reinforcing bars. The failure mode of the coupling beams were studied, as well as hysteretic behavior. The test result indicated that using PVA fiber reinforced concrete could improve coupling beams carrying capacity, and could also reduce the amount of stirrup needed for seismic calculation; PVA members ductility was also improved.

Abstract: Series sample were prepared with solvothermal method using ethylene-diomine as solvent, at 220°C for 24h. All samples are white powder and XRD proofs that all of them are single phases. Using the Laser granularity cryoscopy (rise 2008) to measure the samples size , and most samples sizes are from 150nm to 200nm. SEM photo shows that the Y2O2S:Eu3+ morphologies are spherical but have some aggregation. Emission spectrum of Y₂O₂S:Eu³⁺,M g ²⁺,Ti⁴⁺ shows that while co-doping M g ²⁺,Ti⁴⁺ions , the strongest peak dosent change . Prepared with high temperature solid insoluble samples compared to samples of this water-soluble luminous intensity is not high.

Abstract: In this study, a nanofibrous poly (L-lactic acid) (PLLA) scaffold reinforced by Hydroxyapatite (HAP) and β-tricalcium phosphate (β-TCP) was fabricated using the thermally induced phase separation method. The composite scaffold morphology showed a nanofibrous PLLA matrix and evenly distributed β-TCP/HAP particles. The composite scaffold had interconnective micropores and the pore size ranged 2-10 μm. Introducing β-TCP/HAP particles into PLLA matrix significantly improved the mechanical properties of the composite scaffold. In summary, the new composite scaffolds show a great deal promise for use in bone tissue engineering.

Abstract: Northeast of Larix was degreased by high temperature and pressure steam-vacuum, and study the best conditions of degreasing, different thickness and moisture content of specimens at temperature, time, and vacuum degreasing and drying, testing its degrease rate . The results showed that the degrease rate of wood treated with high temperature and pressure steam-vacuum treatment was significantly improved. The study dealing with conditions can make degrease rate of larch 63.05%.

Abstract: Japanese Sugi (Cryptomeria japonica D.Don) wood was dried by superheated steam under the temperature of 140,160,180°C and the relative humidity of 100% to make wood flooring. Moisture absorption and desorption characteristics, Fourier Transform Infrared Spectroscopy of treated wood were analyzed to investigate the dimensional stability at saturated and dry ambient condition. The results showed that the dimensional stability of wood treated with superheated steam under high temperature was significantly improved.

Abstract: According to analyzing the mechanism coal of spontaneous combustion,Concluded three ways for the prevention and control of coal spontaneous combustion: (1) the elimination of heat accumulation; (2) reduce the oxygen concentration; (3) the blocking free radical chain reaction; And based on the mechanism of flame retardant summarized the types of the inhibitor agent and the inhibitor agent resistance effect, this paper briefiy introduces the research status of the inhibitor agent, and points out the problems existing in the flame retardant materials, put forward material selection problens of a new flame retardant materials and research direction in the future.

Abstract: In the present investigation, carbon nanofibers (CNF) were dispersed in epoxy matrix to form CNF/glass fiber/epoxy composites. Before blending, CNF was oxidated to get more functional groups on CNF and improve the interface combination between resin and CNF, the infrared spectrum was used to test the efficiency. After that, tensile modulus tests were carried on for CNF/glass fiber/epoxy composites with different CNF fractions, the results indicated that there were slight improvements of tensile modulus when adding CNF. At 3.0 wt% of CNF, composites have the high improvement of tensile modulus, but the reinforcement of CNF decreased at 5.0 wt% of CNF. And the CNF reinforcement efficiency was analyzed using modified Coxs model and rule of mixture.

Abstract: A novel method for preparing oleophobic surface is presented. In this article, an oleophobic surface on X70 pipeline steel was prepared successfully by the combination of shot blasting, hydrochloric acid aqueous solution etching, and modified with low-energy material. The influences of the concentration of hydrochloric acid and chemical etching time on the oleophobicity were analyzed. And the optimal experimental parameters were determined. The surface morphology and chemical composition were observed by the field emission scanning electron microscopy (FESEM) and energy dispersive spectrometer (EDS), and the contact angle was measured by contact angle meter. The results showed that micro-nanocomposite structure on the substrate was formed after shot blasting and chemical etching of hydrochloric acid aqueous solution. After low-energy modified, the specimen obtained the better oleophobicity, and the maximum contact angle between the surface and peanut oil was 140°.