Advanced Materials Research Vols. 488-489

Abstract: In this paper, the use of waste and recycled materials that is coconut coir fibres and recycled tyre particles, as fillers filled in flexible polyurethane (PU) foams were studied and analyzed. The composites developed were aimed to use in cushioning applications. There are five different types of free-rise filled-foams were produced by one-shot method. The thermal analysis indicated that it is possible to added coir fibre and recycled tyre to PU formation since they have high thermal stability; 250°C for organic compounds in coir and 350°C for rubber elements in tyre. Through many trials in production, the filled-foams were decided to fabricate with 2.5wt% filler content. The low loading fraction was found causes by effect of fillers to foaming ability as well as foaming rate due to the viscosity created. Besides, the results of morphology studied revealed that filled-foams having cellular structures of possess smaller cell sizes and higher cell densities. The mean cell size of flexible PU filled with 2.5wt% (80P20F) is 23.785% lower than the pure foam

Abstract: The mechanical properties of flexible PU foams filled with coconut coir fibres and recycled tyre were investigated. The densities of foam composites are slightly increase as 2.5 wt% filler loading to foams. Among all, the highest density value is 54.048 kg/m³ as compared with pure foam which is 52.69kg/m3. In compression test, the compressive response of foam composites was presented in three different regions which are elastic, plateau, and densification. The compressive results show the foams filled with 2.5wt% (50F50P) offered the greatest properties. It shows an increment of 10.784% for compressive modulus whereas an increment of 9.329% for compressive strength as compared with pure PU foam. This result may attribute to its varying cellular structure. The compressive results also indicated that there was no any contribution from tyre particles to the foam’s compressive properties unless it is added as the composition described above. Nevertheless, the results of energy analysis show added fillers can enhanced the foam’s energy absorption characteristic. The energy absorbability is found increased on composite which having good compressive properties as well as having cellular structure of possess smaller cell size.

Abstract: In the stir casting process, homogeneous dispersion of reinforcing particles within the matrix material is one such major problem, which influences on the properties of composites. In this research, an attempt has been made to study the influence of fly ash wt.% (10 ,15 and 20), ratio of the impeller outer dia to crucible inner dia (0.7,0.5 and 0.3) and processing method (liquid state stirring, two step stirring and modified two step stirring) on the mechanical properties and the distribution of fly ash particles in the Al matrix.Optimum parameters were identified for attaining the maximum mechanical properties such as hardness and tensile strength of composites by the application of Taguchi method, Analysis of Variance (ANOVA) and the results were validated by confirmation test.The present work could provide a guide for the industrial preparation of composites.

Abstract: This paper proposes a novel architecture of the three-layer cloud. And a practical industrial management system based on virtualization and cloud computing is presented. Since the current industry involves the utilization of various control systems and desktop systems, cloud computing provides us dynamic flexible infrastructure and QoS guaranteed services. With the development of virtualization and cloud computing, how to make the system flexibility and security is very important to industry. The presented system can be used for measuring the consumption of material and energy, monitoring the real-time state of the working environments and optimizing the process parameters.

Abstract: A great number of Eco-industrial demonstration parks (EIDPs) have been built across China in order to set examples for the full implementation of circular economy and eco-industry. However, a series of problems appear, such as confusing definitions on the two concepts of Eco-industrial parks (EIPs) and EIDPs, disorderly macro layout of EIDPs, lacking a regional network system of EIDPs, etc.. The article holds that EIDPs, besides the basic characteristics of EIPs, should highlight the exemplary role. The location and amount of EIDPs in those regions should be decided through macro layout and amount optimization of EIDPs. In light of this view, a case study in Jinlin Province is applied. The net of EIDPS can set examples for the construction of EIPs across the province, and also avoid redundant construction as well as cut the cost of demonstration.

Abstract: In this work, an opportunistic beamforming method combined with OFDM technology is proposed to solve the mismatchment of channel beam-forming matrix and vector-matrix in sparse network. Firstly, introduce a two-stage framework, as scheduling and ultimately beamforming, propose beam power control techniques that do not change the direction of the second-stage beams. Then we adapt this scheme to the multi-carrier scenario, such as OFDM systems, in order to improve the whole system’s performance. Simulation results show that this two-stage OBF adjoined to beam power control techniques scheme can improve the total throughput in sparse network system.

Abstract: Plastic moulded parts should have good mechanical properties and free from defects. Tensile behaviour of plastics plays an important role in defining the quality of injection-moulded products. In this study, numerical simulation (Cadmould) was employed to investigate the influence of gate sizes as well as the injection moulding parameters towards the occurrences of weld lines at Acrylonitrile Butadiene Styrene (ABS) specimens. This research begins from the simulation, fabrication of mould, practical injection process and tensile test. The double gates mould was used to present the weld line defects. The result shows that the smaller gate size produces less weld line in plastic parts, which was verified through simulation process. The optimal parameter setting that produced good tensile strength specimens was also validated experimentally in this research

Abstract: Body armor is a material to protect body from injury of various kind of high speed projectile impact velocity in combat or other dangerous situation. Researchers were found to actively research and exploring new body armor technology due to the invention of new firearms. Furthermore, they were also competing in developing ballistic panel which is lighter in weight, more flexible and comfort in use, cheaper in cost and manufacturability. This paper reviews the body armor commercial and current development materials, structure and construction techniques involved and related works on enhancing ballistic energy absorption.

Abstract: The helical cutting tools have complex geometries. A rack cutter is the most economical tool that has been used for manufacturing helical cutting tool. In this paper, the computer program has been designed to evaluate the manufacture abilities following design concept and analyze the technical parameters of helical cutting tool. The program can simulate the sections of helical cutting tool and the rack cutter, analyze the clearance angle, relief angle, and width top of the helical cutting tool, and modify the rack cutter profile to show the helical cutting tool profile suitably. This program can predict the differences during manufacture process and give the best solution for economical consideration.

Abstract: Five-axis milling is used in the machining of complex shaped surfaces in a wide range of industries. In five-axis milling, one can adjust inclination angle to adapt such machining condition, e.g. to give high material removal and/or to avoid gouging. Choosing an appropriate inclination angle is difficult especially for complex parts with varying surface curvature. On the one hand, a small inclination angle is recommended to have good surface roughness and small scallop height. On the other hand, some regions may need much larger minimum inclination angle compared to the others to avoid gouging. The trade off for this is to have, in practice, a varying minimum (which is considered to be optimal) inclination angle along the tool path, so that while machining, the tool is dynamically adapted to be as close as possible to the surface without gouging. However, applying inclination angle change over some distances influences the quality of machined surface. This paper presented a method to control such inclination angle change to improve part accuracy. Some experimental were conducted to see the results and compared with the one when inclination angle change is not controled. The propose method effectively reduces the surface deviation thus improve part accuracy. More details about this study are presented in the paper.