The increasing needs from industry for efficient and economic manufacturing lead to the emergence and rapid development of integrated computational materials engineering (ICME) that integrates manufacturing simulation...
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ISBN:
(纸本)9780470943199
The increasing needs from industry for efficient and economic manufacturing lead to the emergence and rapid development of integrated computational materials engineering (ICME) that integrates manufacturing simulation, advancedmaterials models and component performance analysis into a whole comprehensive framework, which can be used to optimize the manufacturing process, materials selection and product design. Modeling and simulation of process-structure- property is one of the primary themes of ICME. The present paper presents some latest research and development of modeling and simulation of magnesium (Mg) alloy castings at different length scales for predicting the microstructure and mechanical properties of the casting components, where macro-scale simulation of mold filling and solidification, micro-scale model of microstructure evolution during solidification, and mechanical property model based on structure information are demonstrated. The macro-scale simulation of the casting process took the process parameters as initial inputs and provided thermal history of the whole casting for micro-scale modeling. In the micro-scale modeling, the dendritic structure of primary phase was simulated in both two dimensions (2D) and three dimensions (3D) using a modified cellular automaton (MCA) model that takes heterogeneous nucleation, solute diffusion, interface curvature, and growth anisotropy into account. In the mechanical property modeling, main strengthening mechanisms of Mg-Al series cast Mg alloy were considered. Using the current model the yield strength distribution of Mg alloy wheel casting for automobile was predicted. Material property tests were carried out and the capability of the model was evaluated.
Consumable DE-GMAW is a novel GMAW process with higher greater productivity. However, the consumable DE-GMAW process can hardly maintain stable without a proper control. Aiming at this problem, a rapid prototyping con...
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Research work of wire extension control with Dual freedom PID controller in pulsed MIG welding process of aluminum alloy. In the condition of optimum parameters, the simulations were firstly completed by separately us...
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A real-time synchronous acquisition and control system was designed to meet the requirements of measurement and control for pulsed MIG welding process of aluminum alloy using virtual instrument design software LabVIEW...
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Both in-phase and anti-phase two-soliton bound states were observed in a carbonnanotube based mode-locked fiber laser. This paper also reports preliminary results of bound states with graphene as the saturable absorbe...
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Silver nanoparticles were prepared by pulsed wire discharge (PWD) using silver wire in deionized water at various relative energy (K) from 10 to 98, which is ratio of the charged energy of the capacitor in the electri...
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Silver nanoparticles were prepared by pulsed wire discharge (PWD) using silver wire in deionized water at various relative energy (K) from 10 to 98, which is ratio of the charged energy of the capacitor in the electrical circuit to the vaporization energy of the wire. From energy deposition calculated by the measured voltage and current waveforms, deposited energy of the wire was increased with increasing K. From X-ray diffraction (XRD) analysis, prepared nanoparticles were phase identified as silver. From transmission electron microscopy observations, the shape of prepared silver nanoparticles were spherical and the median particle diameter (D50) and the geometric standard deviation (σg) were calculated from the particle distribution. D50 was decreased from 34 to 19 nm with increasing K. The particle size in prepared by PWD in liquid media can be controlled by K.
Highly oriented titanate nanotube (TNT) film was successfully synthesized by a simple electrophoretic deposition (EPD) method without any hard templates and surfactants. This oriented films adequately utilized the exc...
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Highly oriented titanate nanotube (TNT) film was successfully synthesized by a simple electrophoretic deposition (EPD) method without any hard templates and surfactants. This oriented films adequately utilized the excellent properties of ID nanomaterials such as single crystal semiconductor architectures, large surface area, and superior charge transport, which lead to higher photocatalytic activity. We believe that this versatile method can be extent to fabricate other ordered ID nanomaterials films. [ABSTRACT FROM AUTHOR]
Recently, indoor positioning technology based on received signal strength in wireless networks are becoming more and more attractive. In this paper, we firstly introduced the experimental testbed in a typical office b...
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Recently, indoor positioning technology based on received signal strength in wireless networks are becoming more and more attractive. In this paper, we firstly introduced the experimental testbed in a typical office building. Then, we proposed the mechanism to improve the positioning accuracy by using five different filtering methods because of harsh multi-path environment and all kinds of disturbance in indoor areas. Thirdly, the experimental parameters of five filtering methods, called Limit Filter, Threshold Filter, Max Filter, MA Filter and Kalman Filter, were optimized and analyzed. Finally, we summarized the five filtering methods, and compared the performance of Limit Filter, Threshold Filter and Max Filter in detail. Experimental results demonstrated that the proposed Limit Filter andThreshold Filter can increase the accuracy in 3 meters of 91% to 98%.
A novel method based on radio frequency magnetron sputtering tailored to the deposition of low residual stress and adherent c-BN thin films on silicon substrates was developed. In this study, the effect of noble gas (...
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A novel method based on radio frequency magnetron sputtering tailored to the deposition of low residual stress and adherent c-BN thin films on silicon substrates was developed. In this study, the effect of noble gas (Kr, Ar, Ne and He) added in Ar gas during sputtering on the residual stress and the c-BN content has been investigated. As a result, it was found that the residual stress of c-BN thin film decreased with increasing the helium gas flow rate within argon gas.
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