Applied Mechanics and Materials Vol. 459

Abstract: A new prediction model of material chemical character effects on biofouling mass was built based on Support Vector Machine (SVM), in which there were four input vectors, which were carbon content, hydrogen content and oxygen content of the solid materials and flow rate, and one output vectors, which was the average amount of biofouling formed on the solid surface. Firstly, creating the sample database and normalizing all samples. Secondly, training the model based on the training samples to obtain the optimal prediction model, then, predicting the training samples. Comparing with experimental results, the accuracy of the SVM model is 95.5%. Besides, the model was tested by poly (ethylene terephthalate), and the predicted and actual results are consistent. Thus, the construction of the predictive model is reasonable and feasible.

Abstract: Gigacycle fatigue properties with interior-induced failure of three high strength steels under different loading conditions were investigated, and an experimental-theoretical method is proposed to quantitatively evaluate the threshold condition of interior crack growth. The entire growth process consists of small crack growth within fine granular area (FGA), stable long crack growth outside of FGA within fish-eye and unstable crack growth outside of fish-eye. Based on the comparison between evaluated and experimental results, the validity of method is verified.

Abstract: Maintenance of electrical leads to a deterioration of the dielectric properties of high-voltage isolation and failure, so the role of preventive methods of monitoring of electrical insulation condition increases.To determine the remaining life of the cable and effectively determine the location of damage to the cable line (CL) on the need to use non-destructive test method. Relevance of the work is to develop a method for the continuous monitoring of electrical insulation with sufficient technical and economic efficiency. The purpose of the investigation is to improve the reliability of the electrical insulation of power equipment.

Abstract: This paper introduced a research work on the development of a Broadband Smart Skin Antenna Structure (BSSAS). This structure possessed the load-bearing, shape maintaining and communication capabilities at the same time. A frequency-independent planar log-spiral antenna suitable for electromagnetic communication from 0.8GHz to 8GHz was embedded in a composites sandwich panel. Numerical models have been generated to analyze the effect of geometric parameters and material properties changing on the electromagnetic performance of BSSAS. The numerical results showed that both VSWR and the maximum gain of BSSAS at 1.2GHz and 1.6GHz were not sensitive to the geometric parameters and material properties of the packaging structure.

Abstract: China is a big country of production of fly ash, in this paper, the development status of China's coal ash and its comprehensive application situation, has analyzed the importance and the economy of the comprehensive utilization of fly ash.To provide reliable data for the comprehensive utilization of fly ash.

Abstract: High performancesteels (HPS) require low yield ratio, high uniform elongation and high low temperature impact toughness in addition to higher strength. In this paper,experimental steelswere produced by controlled rolling and tempering to meet high performance requirements. Itwasconcluded that experimental steels by controlled rolling and tempering had similar performance with quenched and tempered steel (QT).

Abstract: This paper reports on experimental comparisons of coefficient of performance (COP) of a thermoelectric coolingsystem which cooled the hot side of the TEC by water (wc), ethylene glycol (egc) and nanofluids (nfc) The nanofluids is composed of ethylene glycol with silver nano(35 nm).The TEC was composed of the TE cooling modules, heat exchanger, and the air cooled heat sink at the cold side of the TE modules.Experiments were conducted with various current input 1 - 4.5 A to find out the optimum current input condition. To consideration of cooling capacity and COP of system was measured the hot and cold side temperature of TEC. Results shown that, the cooling capacity was increased with current input. The maximum cooling capacity of nfc, egc and wc are about 72, 62 and 41 W, respectively. Considered with highest COP found that the optimum current input is approximately 2.5 A. The maximum COP of nfc, egc and wc are about 2.01, 1.7 and 1.12, respectively. Therefore, the proposed TEC-nfc concept is expected to contribute to wider applications of the TE cooling system.

Abstract: For the bulging of sheet metals under hydraulic pressure on concave surface, constitutive relation, static equilibrium conditions, and approximate geometrical relation were discussed about the source of calculation error. Dimensionless deflection at the center of sheet was used as the intermediate variable, and a simple but efficient nomographic algorithm addressed for strain limit is presented in this paper. The results of the calculation were compared with that of the uniaxial tensile test, the bulge test, and the Finite Element Analysis (FEA). This method has the potential for industrial applications such as pressure forming, bulge test, and rupture disc manufacturing.

Abstract: The paper presents a variant analysis of the structure of SOEC systems. The main parameters of such systems are indicated and commented. The comparison of various configurations is shown in terms of efficiency obtained. High efficiency (70%) hydrogen generation seems possible with systems like these.

Abstract: This article presents the bender element technique to determine the stiffness of Bangkok clay mixed with the Portland cement type 1 and the fly ash type F by means of shear wave velocity. The Bangkok clay was mixed with 20% by weigh of Portland cement type 1 and varied the amount of fly ash (0, 10, 15, 20, 25 and 30% by weight). The soil-cement samples were cured for 3, 7, 14, 28 and 90 days. Then, these samples were performed the bender element test. The results reported that the optimum of replacement fly ash was about 15-20% and showed that the stiffness of soil-cement-fly ash mixing was increased with increasing the curing time. However, the shear wave velocity results were higher than the result of 0% replacement of fly ash which was the long term behaviour of cement mixed with fly ash.