Applied Mechanics and Materials Vols. 271-272

Abstract: The theoretical prediction of main strengthening elements, final hot rolling， coiling and intercritical annealing soaking temperature were conducted by thermodynamic calculations, which agreed with the experimental results. The good formability and bake-hardening-index property gained from the experimental procedure according to the calculations show that, n (tensile strain hardenability value), r (plastic strain ratio) and BH2 (bake-hardening-index) represent maximum value when soaking temperatures were set from 800 to 820°C, the maximum value of n is 0.21, r is 1.39, BH2 is 44 MPa.

Abstract: Coupled steel bars is a kind of cold working steels, It was processed by two parallel cold-drawn that’s they are longitudinal reinforcement wedding with short and band cold-drawn that’s low-carbon steel are transverse reinforcement. So, study on its mechanical and technology properties, get suggestion model calculating formulas of crack width and stiffness are presented. The advantages of cooperating between coupled steel bars and concrete have been primarily accepted.

Abstract: Ceramic fiber is a kind of fibrous lightweight refractory with many advantages of light weight, thermostability, good heat stability, low thermal conductivity, small specific heat, and resistance to mechanical vibration and so on. As a result of them, it has been used widely in lots of fields, such as machinery, metallurgy, chemical industry, oil, ceramics, glass and electron. From the aspect of the ceramic fiber development, in this essay, the types and preparation methods of ceramic fiber have been listed one by one, and the author focused on analyzing the development trend of ceramic fiber and the application in papermaking industry.

Abstract: This paper discussed fabrication of TiO2 and BaTiO3 nanotubes by sol-gel method and used anodic aluminum oxide (AAO) as template. The mechanical properties of TiO2 or BaTiO3 NTs are not great, so a longer tube can crack easily, leading to the peeling off of the NTs film from the Ti substrate. Therefore, we propose to use AAO as a template, followed by deposition of TiO2 and BaTiO3 NT inside AAO to make a working electrode for further electronic devices.

Abstract: An electron beam pumped rare gas excimer lamp (EBEL) was utilized to emit the intensive vacuum ultraviolet (VUV) radiation at 126 nm for soft single photon ionization (SPI) of polycyclic aromatic hydrocarbons (PAHs) in a soil sample. The VUV light source was coupled to a compact and mobile time-of-flight mass spectrometer (TOFMS) for the on-line measurement of PAHs. The moderate desorption temperature was set at 300 °C to guarantee the rapid evaporation of the PAHs in the soil sample and without decomposition from the larger molecules. With the thermal treatment, sample extraction and cleanup steps were not needed. The system developed herein was found to perform sufficiently well to evaluate the PAHs in the environmental soil sample at ppm level.

Abstract: It has an great significance for making heat treatment technology by researching the law of temperature variations of ductile iron in austempering. Based on the three-dimensional finite element method (FEM), the temperature variations of low alloyed bainite ductile iron in austempering are studied in this paper. The temperature relativity of the thermal physical parameters is considered during building the model. The simulation result demonstrates that during the stage of rapid cooling, the cooling speed of the surface is faster than that of the center, and the whole cooling speed increases firstly, then decreases. During the stage of isotherm, the surface temperature of the sample increases to the isothermal temperature directly, while the center temperature decreases firstly, then increases, until to the isothermal temperature.

Abstract: The micro-emulsified ethanol-diesel blended fuel is an ideal alternative oxygenous fuel for diesel engines due to its physical and chemical properties and excellent combustion characteristics. Fueled with this fuel, a diesel engine can give off remarkably lower harmful emissions,especially particulate. It is necessary to take into account instantaneous variations of the thermophysical parameters of blended fuels with temperature and pressure. For these reasons, this paper use the empirical formulas calculates the thermophysical parameters of this blended fuel，including the specific heat capacity, viscosity, thermal conductivity and diffusion coefficient. And the effects of the temperature, pressure and ethanol content on the initial blended fuel’s condition are investigated. The results show that the addition of some ethanol to the diesel oil can contribute to the evaporation of the micro-emulsified ethanol-diesel blended fuel, and these empirical formulas are able to be employed to calculate the thermophysical parameters of this blended fuel.

Abstract: This study is a 3-year national research project. The objective of this study is to examine the influence of formaldehyde and VOC emissions with different application ratios of ultra-low emission (ULE) green building materials(GBMs), and their impact on human health in indoor environments. The testing methods for aldehyde and ketone substances, and VOC substances used in this study are referenced from the ASTM D6670-01 regulations by full size chamber test method, and the ISO 16000-3 and ISO 16000-6 regulated aldehyde and ketone substance, and VOC sampling and analysis methods. Experiments are conducted at 0%, 30%, 50%, 80% and 100% (5 groups) ratios of ultra-low emission (ULE) green building material used, and the emissions are analyzed. The results show that the higher the utility rate of ULE green building material, the more the interior concentration of TVOC can be effectively lowered. Using at least 30% ULE green building material can achieve indoor air quality that is less than the TVOC value standard of 3 ppm set by the Environmental Protection Administration of Executive Yuan, Taiwan. However, under the standard of 300 ug/m3, set by the World Health Organization and the GreenGuard children’s standard of 220 ug/m3, our research shows that the experiment groups using 30%, and not using (0%) ULE green building material, present a health risk, based on the above standards. However using more than 50% ULE green building material can effectively lower the VOC emission level, indicating that by increasing the use of ULE green building material, the IEH can be maintained.

Abstract: Referring to the ultrasonic vibration effect on casting, welding and laser cladding, the paper demonstrates the feasibility that it can be also used in Laser Metal Deposition(LMD)of titanium alloy to protect the defects such as crack,pore and oxidation and refine the grain size and improve the distribution uniformity of solidified structure.So the paper applies ultrasonic vibration system to fabricate the functionally graded materials(FGMs) samples and analyses its effect on the specimen microstructure and mechanical property by experiments.The results show that ultrasonic vibration can suppress the formation of pore、refine the grain and make the TiC hard phase more homogeneous in the FGMs parts, which is also indicated by the microhardness tests

Abstract: Through the equipped with spiral reinforcement of the prestressed anchorage performance test, verify the spiral reinforcement for anchoring system the function and necessity. And using finite element analysis software of prestressed member was compared and analyzed, analyses the influence of the spiral reinforcement of concrete and the spiral reinforcement stress distribution.