Advanced Materials Research Vols. 194-196

Abstract: In order to improve the compatibility between SiC particles and aluminum, the SiC/Cu composite powders were prepared by using chemical plating method to coat a Cu layer on the SiC particles surface. The obtained powders were made into preform and then put it into molten aluminium. SiC/Cu-Al composite were produced by using pressureless infiltration method under argon gas. By scanning electron microscopy (SEM), optical microscopy (OM), X-ray diffraction (XRD),the phase structure and microstructure of SiC/Cu composite powders and SiC/Cu-Al composite were analysed. Moreover, the temperature and soaking time on the effect of SiC/Cu-Al composite infiltration depth and effect were studied. The results show that: Cu coating on the SiC particles surface distributed uniformly; SiC/Cu-Al composite prepared at the condition of 800°C and 2 hours soaking time has a densification microstructure, SiC particles uniformly distributed in the aluminum matrix and there is no Al4C3 brittle phase formation; at 700°C～900°C infiltration, as the temperature growing, infiltration depth increases at first and then decreases; the microstructure of SiC/Cu-Al composite which infiltrated 2 hours is more compact than that 1 hour; Cu coating effectively improved the wettability between SiC particles and molten aluminum, and inhibited the formation of harmful interfacial reaction.

Abstract: This study have used three different montmorillonite by anionic, nonionic and ammonium chloride modifier to prepare polyethylene / montmorillonite (MMT) nanocomposites. The kneading process doped modified MMT to polyethylene, according with ASTM D638 to proceed hot-press works, and ASTM D256 to determine the izod pendulum impact resistance of plastics specimen. Prepared nanocomposites continue proceed in tensile and impact testing, finally, we observed low-density polyethylene layered silicate nanocomposites properties were improved, also found that anion modified montmorillonite had significant reinforcement effect in tensile and impact testing.

Abstract: An investigation is reported in which four three-dimensional angle-interlock architectural fabrics were designed and woven. Composite panels were manufactured by impregnating the fabrics with resin.The related experiments included tension, compression and bending. All those tests were performed to measure the Young's moduli and strengths in the 0°(warp direction), 30°, 45°, 60°, 90° (weft direction). The experimental methods, preforms parameters were also described in this paper. The results show that, mechanical properties of four three-dimensional angle-interlock architectural composites behaved in-plane anisotropic , two peak values along the warp and weft direction respectively appeared in any one graph , and the yarn-stuffer played a key role in determining mechanical properties of three-dimensional angle-interlock architectural composites, especially contributed intensifier in corresponding direction obviously.

Abstract: The accumulative damage model in which the material’s plastic strain is defined as variable and the energy dissipation is also considered is applied to the combined welded heavy steel plates. And the reliability of the model is confirmed by comparing the computed results in finite element project ABAQUS to tested results from previous researcher. On that basis, a series of steel plate components are computed to analyze their hysteretic curves and ductility factors. The influences of steel plate thickness, web’s height-thickness ratio and flange’s width-thickness ratio on hysteretic behavior are studied.

Abstract: Industrial design is a design practical activity based on innovation. TRIZ is a method and tool about systematic innovation. The invention principles of TRIZ are suitable for finding a new path of industrial design. This paper analyses the basic principle of TRIZ theory, and discusses the application of the principle of TRIZ in industrial design field. On the basis of the theory of TRIZ, two new products are designed. The corresponding result shows the combination of industrial design and innovation methods will promote industrial design.

Abstract: Remodeling is also an environmentally-friendly approach that reduces the amount of waste in construction site. Specifically, there are many attempts to make house more wide according to the merging of two old houses in apartment buildings. For making two houses into single housing area, openings shoud be needed or walls should be removed. However, removing shearwalls are very dangerous attempt because of reducing of lateral load capacity of buildings. Therefore many engineers prefer to leave shearwalls. However, there are insufficient studies about partial damage, that is, openings. In these cases the damaged shear walls need to be retrofitted by additional materials or members. In this research, four specimens were tested to investigate the capacity of the damaged wall and the retrofitted wall. The artificially damaged wall was prestressed by tendons to improve the shear capacity of the wall, and the other walls were retrofitted by adding steel plate at the surface for the same purpose. Consequently, these retrofitted walls had improved capacity and stiffness in both shear and flexure. Especially, the wall with steel plate showed ductile behavior after ultimate load and the prestressed wall had greater stiffness than the unstrengthened prototype wall.

Abstract: The installation of new opening is necessary for remodeling project, house merging type. Current structural design code cannot provide the deterministic way for designing the shear walls with openings. So many engineers prefer to retrofit the perforated wall area for the structural safety. For the safe design of retroftitting, for the perforated structural walls, we carried out nonlinear finite element analysis to find the coupling effect of remaing walls. Specifically, many types of shapes were considered and various area of rectangular openings were analyzed. For the effective retrofitting, door shape and such area about 20% of wall is appropriate for retrofitting of reinforced concrete shearwalls.

Abstract: This paper studies the earthquake performance of strengthening unreinforced masonry structures with CFRP. Using CFRP reinforced masonry structures can substantially increase the ultimate flexural strength and resisted deformations of the walls and columns ,at the same time can also effectively dispersed the distribution of crack width of cracks and constraints.

Abstract: The scattering of SH-wave caused by the subsurface circular cavities in an elastic half-space covered with an elastic layer was discussed, which was based on the complex function method and wave functions expansion method. The solution of scattering of SH-wave was given by using circular boundary of large radius to approximate straight boundary of surface elastic layer. According to boundary conditions, we needed to solve the infinite linear algebraic equations with unknown coefficients in wave functions. Finally, the dynamic stress concentration factors around circular cavities were discussed in numerical examples.

Abstract: The kinetics of corrosion process on Ni-Cr-Mo-Cu alloys designed by formula APF=4Cr/(2Mo+Cu) in H₂SO₄ solution have been investigated from the concentration of 0.002mol/cm³ to 0.012mol/cm³ at 20 . Analytical expressions for cathodic reaction were developed for the reduction of H+ and the reduction of oxygen. It is discussed that the corrosion resistance to H2SO4 solution depend on the APF in regular way.