Advanced Materials Research Vol. 1016

Abstract: This paper aims to implement an OMM (on-machine measurement) system using a touch trigger probe installed on the spindle of the milling machine with Fanuc 0i-mc CNC system. The CNC used in the milling machine is Fanuc 0i-mc system. The hardware system configuration for OMM and its software were both presented. The software is composed of several modules, and the most significant one is for generating measurement program based on CAD model of workpiece. This paper mainly presents the specific construction of the measurement macro for Fanuc system.

Abstract: New optimized aerospace structures use composite materials for critical components and subsystems which make essential the knowledge of their fatigue properties. In the present work, the conventional methodology based on linear damage accumulation rules, applied to determine the fatigue life of structures subjected to spectral loads was evaluated for an aeronautical Carbon Fiber Reinforced Epoxy composite material. A test program has been performed to obtain the classical S-N curves at different stress ratios. Constant life diagrams, CLDs, where determined by means of Artificial Neural Networks due to the absence of consistent models for composites. A series of coupons have been tested until failure with a modified version of the standard FALSTAFF load sequence and were compared to the theoretical damage index calculated based on the conventional linear damage accumulation rule. The obtained results show non-conservative predictions.

Abstract: Based on air cushion belt conveyor, a new type of belt conveyor named water cushion belt conveyor is proposed. It has a wide scope of applications for its features such as stability and reliability, capability of full load start-up, and environment-friendliness. This paper studies the working mechanism and lubricating mechanism of the water cushion belt conveyor. The basic lubrication equation of the water cushion is deduced from the universal form of the Reynolds equation used to study the pressure film properties of the water cushion. The design of the key part of the water cushion device is described in details. The research can be taken as a reference in practical applications.

Abstract: As one of the new models of service of integrated manufacturing system, Cloud manufacturing (CM) is a service oriented, customer centric, demand driven manufacturing model.Application providers offer manufacturing services through the network, to make the cooperation among the participants of CM more effective. The behaviors of participants have great effect to the development of CM, especially in the beginning of its application.In this paper, we make analysis on interaction among all the participants of CM based on game theory, and give some suggestions to promote the application of CM.

Abstract: This paper study the effect of the calcium carbonate (CaCO₃) nanoparticleson mechanical and physical properties of virgin and waste polypropylene (pp_.). 3, 5, 7 and 10 (wt. %) of CaCO₃nanoparticles are mixed with each of virgin and waste pp_. These mixture are blended in co-rotating twin screw extruder at 190 °Cand different screw speed (25 and 50 rpm). Different mechanical and physical technique are used to evaluate the characteristics of polymer nanocomposites ex: Tensile strength , elastic modulus , impact strength , hardness and density. The results of virgin pp./(CaCO₃) showed that The tensile strength decreasing with nano(CaCO₃) concentration for virgin pp. , while for waste increasing at 5% and then decreasing gradually. The impact strength increasing with nanoCaCO₃concentration increasing. The hardness and density increasing with the increasing of the nanoCaCO₃concentration for two type of pp.Nearly all the mechanical properties were found to increase with the processing speed of 25 rpm. In this studies, it was seen that the highest processing speed of 50 rpm does not give the material performance enhancements due to higher shear intensity which causes defect points in the structure. Also the time is smaller at high screw speeds, so there is not enough time for good dispersion to occur.

Abstract: V-band clamps offer an efficient clamping solution in diverse applications including process equipment, exhaust systems and air handling. This paper studies the distribution of interface contact pressure between the V-band and flange when the coupling is established. The determination of the contact area and pressure distribution in a joint is essential information, as it determines the integrity of the coupling. A three dimensional finite element model has been developed for this purpose. Contrary to the previous assumption in developing axisymmetric models, the 3D results showed that the contact pressure is non-uniform around the circumference of V-band with maximum contact pressure near the T-bolt area. This is in agreement with the theory in the literature. The presence and magnitude of friction has a noticeable influence on the form of the interface pressure distribution curve. It is also shown that the diameter of the band interacts with the effect of friction.

Abstract: Multi-criteria optimization problems are known to give rise to a set of Pareto optimal solutions where one solution cannot be regarded as being superior to another. It is often stated that the selection of a particular solution from this set should be based on additional criteria. In this paper a methodology has been proposed that allows a robust design to be selected from the Pareto optimal set. This methodology has been used to determine a robust geometry for a welded joint. It has been shown that the robust geometry is dependent on the variability of the geometric parameters.

Abstract: The purpose of this paper is to describe the computational procedure developed to apply the Bond-based Peridynamic Theory to nanocomposite materials. The goal is to predict the Young’s modulus as a function of the filling fraction of different nanocomposite materials with an accuracy better than that of other methods (like Halpin-Tsai, Mori-Tanaka, FEA models). A displacement control method is adopted here in order to simulate the incremental application of an external load. The constitutive law considered is linear and thus the problem can be seen as a static-linear problem. A description of the model and of the “multiscale approach” is given, supported by a comparison between experimental data and simulation results for different nanocomposites.

Abstract: Surface roughness on machined part is a key performance index of surface quality for metal machining industry. Machining condition is a way to reduce surface roughness of the machined part. This study aimed to determine the significant factors affecting surface roughness and to obtain the optimal machining operation in turning process. The Shainin design of experiment method was used to investigate the effect of five machining factors on surface roughness in turning process of carbon steel. Furthermore, analysis of variance and multiple comparisons were used to determine the optimal machining condition of the significant factors. The results showed that set of the cutting tool angle was the only significant factor affecting the average surface roughness with the optimal operating condition of 120 degree used for reducing surface roughness of the machined part.