Emerging Systems for Materials, Mechanics and Manufacturing

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Authors: Yu Zhi Jiang, Li Li Zhang, Yan Bo Li
Abstract: The magnesium hydroxide (MH) whiskers / ABS composites were prepared by melt-extrusion with modified whiskers as filler. The mechanical performances, including the tensile strength, elongation at break and elastic modulus, were tested by electronic universal testing machine. The results showed that with the increasing of the whisker dosage, the tensile strength and elongation at break reduced gradually, and the elastic modulus get maximum when it is 25%.The morphology on fracture of composites was analyzed by SEM. The conclusions are the whiskers of surface modifications can be evenly distributed in the composites and bond partly with ABS. that it is necessary to enhance the combine strength of interface on excellence performances of composites.
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Authors: Xiong Xin Hu
Abstract: As an excellent material, Magnesium (Mg) alloy was widely used in automobile, IT product and aerospace industries. The magnesium alloy heater needs a robust controller to advance on the high accuracy, the static and dynamic stable characters, and the heater’s time delay. Firstly the magnesium alloy furnace mechanical model based on multi-layer equivalent thermal network for a radiant tube is introduced. The numeric model in one dimension steady heat transfer was developed. And a series of linear systemic characters were developed via experimental research. Secondly the furnace control system model was developed, which was built on the PID and Smith predictor in detail. And its kernel algorithm was simulated and applied in the furnace equipment system. Comparison of the Smith predictor and the conventional PID controller demonstrated that the former could eliminate the static error, reduce overshoot, shorten regulating time, and improve control precision and running stability. Finally an example which was a whole process experiment of the Mg alloy melting was given. It should be drawn that Smith predictor control system was superior to the conventional PID controller in the heater.
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Authors: Peng Peng Huang, Hai Wen Liu
Abstract: Considering the practical problems in the threshing and redrying production, in order to improve the manufacturing process quality, by using twice hot-air tobacco embellishing as the critical process in production flow and applying SPC technology, through the online data collection, this paper analyzed the causes of quality defects in the course of production and made adjustments. The conclusion is that SPC technology ensures the quality stability of the tobacco processing progress, and also strongly improves the process capability, which achieves the 3σ Control of product quality.
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Authors: Ying Hua Ye, Wen Peng Liu, Bo Diao
Abstract: Industry Foundation Class, which is an international standard Building Information Model (BIM) is adopted to archive and manage RC structure life cycle durability information. An IFC-compatible durability controlling system (IFC-CDCS) for RC structure is developed, which can retrieve, resolve, create, and analyze IFC files at the level of source code. The framework of IFC-CDCS is demonstrated, and the essential module of IFC interface is elaborated by specifying the data type mapping mechanism, IFC resolving toolkit, IFC data extending methodology. An IFC project created with Autodesk Revit is loaded into the system to testify that the information from IFC file can be correctly and efficiently extracted and processed by IFC-CDCS.
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Authors: Yu Jing Lan, Yu De Liu, Yi Jian Sheng, Wen Tian Shi, Yuan Zhang, Yang Liu
Abstract: Food waste is rich in nutrients. It can be disposed safely by biotechnology, which can make a contribution to environment, and avoid wasting resources. The bio-reactive food waste disposal processor basing on aerobic composting technology is designed in the research. The miniaturization and practical of it can be realized by studying its integrated form and structural components.
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Authors: Jin Hua Chen, Xiang Dong Huang
Abstract: To improve the lower leg impact performance of the vehicle bumper in the collision of vehicle to pedestrian, the finite element (FE) model of a vehicle front structure was developed, and correlated with the test results. The lower legform impactor FE model was used to investigate the performance of the vehicle bumper at different structure conditions. It was finally determined that vehicle to lower legform impact performance can be improved by reducing the energy absorbing foam stiffness and modifying the bumper bracket structure to enlarge the collapse space.
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Authors: Ming Jin Yang, Xi Wen Li, Tie Lin Shi
Abstract: Fluid flowing of mixing is mathematically expressed as mapping. The Smale horseshoe map is a typical model for cohesive mixing, and has a tremendously positive influence on mixing. Based on Smale Horseshoe Mapping Model, a method of defining move parameters of the mixing system of a planetary mixer was presented in this paper. The fluid flowing of the mixing system obtained shows good performance of ergodicity and mixing.
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Authors: Hyung Joon Bang, Soo Hyun Kim
Abstract: This paper introduces a FBG (fiber Bragg grating) based AE (acoustic emission) sensing system for use in health monitoring of composite wind turbine blades. In this study, a multiplexing high speed FBG sensor system was developed with a spectrometer-type demodulator based on a linear photo detector. Pencil break test was performed using an FBG sensor and the results were compared with the results of piezo-based AE sensor. For the performance test of fracture sensing in composite materials, a down-scaled wind turbine blade was fabricated and drop impact tests were performed. Arrayed 4 FBG sensors were installed in the skin of wind turbine blade and impacts of 15 J energy were applied by a drop weight. The frequency characteristics of impact induced AE signals were examined with short-time Fourier transform focused on the leading waves. Finally, the onset of fractures in composite structure was successfully assessed using arrayed FBG sensors.
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Authors: Soo Hyun Kim, Hyung Joon Bang
Abstract: This paper provides an overview of the failure mode estimation result with 3D finite element (FE) analysis model of wind turbine blade. In order to predict the realistic behavior in the whole blade region, fiber failure (FF) and inter-fiber failure (IFF) analysis were applied to account delamination or matrix failure on composite materials. The Puck’s fracture criteria were used for the IFF evaluation. For the comparison of FE analysis result with the measured data of static test, a 3.5m down-scaled wind turbine blade was designed and fabricated using glass fiber epoxy composite materials. A nonlinear static structural analysis was performed and then the failure mode and the location were estimated with the FF and IFF analysis.
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Authors: Xiao Feng Tian, Wei Ke Zhang
Abstract: A fast and facile wet chemistry method has been developed for preparing monodispersed silver coated copper composite particles. Copper powder is coated using a solution containing [Ag (NH3)] +. The effect of the copper particle size distribution, the concentrations of [Ag (NH3)] + on composite particles conductivity were investigated. The composite particle with electric conductivity of 0.8×10-3 Ω•cm is obtained at 0.8 mol/L of Ag+ and1.0 g/L of dispersing agent. Copper powder loaded with silver particles morphologies range from individual particles to small islands, to the continuous multi-layers structure with Ag+ concentration increases.
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