Applied Mechanics and Materials Vols. 457-458

Abstract: Al-2.8wt.%Mg alloy samples were subjected to equal channel angular pressing (ECAP) with different number of passes, and the corrosion resistance of as-cast and ECAP-processed samples was investigated by immersion tests and electrochemical impedance spectroscopy measurements. The results show that the corrosion resistance of the alloy is improved with increasing ECAP passes.

Abstract: Based on the experiments did by B.K.Parida and T.Nicholas [1], the fatigue crack propagation rate of TiAl alloy under different stress ratios had been tested in order to find out the role of stress ratio and to derive an improved fatigue crack propagation formula for region II(the expansion region) according to Paris formula and to calculate the specific values of the constants in the formula. The experimental results reveal that stress ratio has a significant influence on fatigue crack growth rate.

Abstract: In order to know the corrosion behavior of 16MnR in the circulating water system and determine the influential sequence of factors, such as chloride ion concentration, temperature of circulating water, pH value and calcium ions concentration, to the corrosion of 16MnR. In this article, the electrochemical impedance test of 16MnR was conducted with electrochemical test system of CS310. The orthogonal test is adopted and the influential sequence of each factor to the corrosion of 16MnR is obtained by range analysis. The result shows that the impedance spectroscopy of 16MnR in the circulating water is a single capacitive reactance arc; the parameter which controls the corrosion process is the solution resistance R_P and with the increasing of R_P, the impedance value increases thus slowing down the corrosion velocity of 16MnR; the greatest impact on the corrosion of 16MnR are chloride ion and the temperature.

Abstract: This study provide several straightforward ways to fabricate nanoporous fibers with diameters in the rang from nanometers to several micrometers.The PAN nanoporous fibrous materials are unique in their ultrahigh specific surface and porous geometry and have the potential to meet emerging needs in advanced technical applications. PAN nanoporous fibers were electrospun in a single process by varying solvent compositions. Polyacrylonitrile (PAN) and Polylactide (PLA) bicomponent electrospun fibers, upon removal of the PLA by CF solvent extraction, became nanoporous. The surface morphology of the electrospun PAN fiber are investigated by a Scanning Electron Microscope (SEM).

Abstract: For the shorting of fracture mechanism from the point of high temperature condition, so a new method of illustration, which is carried out under the condition of high temperature, for fracture mechanism will be adopted in this paper. And a more accuracy and more understandability result can be got by this new method. Besides, the performance of TiAl alloys can be improved by making grains refined to decrease the slip plane spacing, which can be got from the mechanics analysis.

Abstract: The models of the multi-bundled conductors are constructed by finite element method in this paper. The numerical results are given by using the 4th order Runge-Kutta method considering aerodynamic parameter of sub-conductor. The simulation results are obtained on galloping of quad bundle conductors with the different span. Thus some effective numerical results of quad twin bundle conductor can provide a useful reference for anti-galloping design.

Abstract: To study functionality of coffee yarn knitted clothing fabrics, use five different proportion of coffee yarn: 70% viscose/30% coffee yarn; 67.5% viscose/32.5% coffee yarn; 65% viscose/35% coffee yarn; 62.5% viscose/37.5% coffee yarn; 60% viscose/40% coffee yarn, knit five kinds of fabrics on computerized flat knitting machine.Test and analysis odor removal performance, hygroscopic, heat accumulation function of trial fabrics. The results show that: to coffee yarn and viscose blended knitted fabrics, along with coffee yarn content increases, the odor removal rate of the fabric has increased significantly, the fabric hygroscopic enhance, better performance of heat accumulation. 40% coffee yarn content of the fabric has a good heat accumulation.

Abstract: It is a worldwide difficulty to preserve earth monument in wet area. To solve this problem, Physical Chemistry Institute of Zhejiang University in China developed a consolidation agent named RTV (organopolysiloxanes+tetraethylorthosilicate). But the study on this consolidation agent is still in its initial stage at present for most of its experimental researches are limited to east china and no research reports aimed at wet area in southwest China were found so far. To check out the efficiency of this consolidation agent for earth in wet area, southwest China, a consolidating experiment was conducted by applying this consolidation agent to soil samples from kiln Qionglai earthen monuments located in outskirt of Chengdu city, the capital of Sichuan province. In this experiment, the changes of weight, permeating speed and depth and compressive strength of specimens after consolidating were investigated and compared with those for northwest area. The study shows that RTV consolidation agent developed by Physical Chemistry Institute of Zhejiang University is also effective to a certain degree for the earth monument in wet area, southwest China.

Abstract: Material science is an interdisciplinary field applying the properties of matter to various areas of science and engineering. In this work, we study construction and properties of orthogonal two-direction vector-valued wavelet with poly-scale. Firstly, the concepts concerning two-direct-ional vector-valued waelets and wavelet wraps with multi-scale are provided. Secondly, we prop ose a construction algorim for compactly supported orthogonal two-directional vector-valued wave lets. Lastly, properties of a sort of orthogonal two-directional vector-valued wavelet wraps are char acterized by virtue of the matrix theory and the time-frequency analysis method.