Applied Mechanics and Materials Vol. 197

Abstract: The table-manipulation method plays a important role in optimizing resource scheduling, scientifically location chosen, task assignment, investment distribution and so on. Most literatures introduction the table-manipulation method used to single thought pattern, for example, the algebra thought model, the shape thought model, or Computer software method, which cruse it is difficult to understand and apply. Therefore, a novel table-manipulation integration approach is proposed by combining the thought of algebra-shape-computer. This builds convenient access among the abstraction, modeling, solving on the practical optimizing problems discussed above.

Abstract: The peanut shell(PS)/phenolic formaldehyde(PF) resin biocomposites were prepared by condensation polymerization.Phenol and formaldehyde respectively dissolved in water in which peanut shell powder is suspended , were copolymerized at 90～950C with H2SO4 as catalyst , resulting in PS/PF biocomposites. It was observed that peanuts shell powder were uniformly dispersed in the biocomposites. Compressive strength of the biocomposites can reach 37.9 MPa, increased significantly comparing with that of phenolic resin obtained in the same conditions.SEM were used to characterize the morphology of the biocomposites.The results of SEM showed that there was less two-phase separation in the biocomposites by controling reaction conditions. It is suggested that the chemical reaction between phenolic resin and PS may be the main reason for the formation of the biocomposites..

Abstract: Thin metal sheets are increasingly used for different purposes in automotive and aerospace industry. These sheets are prone to wrinkling during forming which is a major defect. Wrinkles are formed due to non uniform compressive stresses resulting from multi axial stretching of materials. Its initiation may be due to material properties, geometric constraints and stress applied. This research is focused on FEA of steel ASTM A36 sheets to predict their wrinkling initiation and growth.

Abstract: Wrinkling is one of the most undesirable effects during forming of thin sheet metal plates. It deforms the surfaces and either hampers further assembly or creates stress concentration regions which may fail during operations. Yoshida wrinkling test is considered as one good tool to analyse the wrinkling properties of sheet metals. Alluminium alloys are most commonly used in aviation industry where wrinkling initiation and its propagation is considered an even serious defect. Present research was therefore focussed on Finite Element simulations of Allumium Alloy-5456-H116 metal sheets specimens of the standard shape of Yoshida specimen. During simulations the applied load values were equal to Yield strength, yield strength +10%, and Yield strength -10%. Wrinkling initiation and propagation was observed as deformations along X,Y and Z axis on a predefined path of the specimen and stress values at this path were also evaluated. Findings have been established through an overview of deformation along each axis corresponding to stress values at that location on the path.

Abstract: Aluminum is one of the most popular metal in a wide variety of applications in manufacturing of components for airplanes, automobiles, house hold etc. A wide variety of parts are manufactured using aluminum sheet of different alloy composition. Wrinkling of sheet metal is the most undesirable phenomenon in sheet metal forming, drawing, punching and other similar manufacturing processes. Current research is focused on Finite Element Analysis of Aluminum 6061-T6 sheet to simulate onset and growth of wrinkles of various thicknesses using ANSYS. Based on the results a comparison was drawn between the wrinkling behaviors at varying load values.

Abstract: A spectral based low-dimensional spatio-temporal modeling approach is proposed for thermal crown of work rolling in aluminium alloy rolling processes. Firstly，the Karhunen-Loève (KL) decomposition is used for dimension reduction and time/space separation. The neural networks are used for dynamic modeling. The simulations have demonstrated the effectiveness of the proposed spatio-temporal modeling approach..

Abstract: Molecularly imprinted polymers of bisphenol A were synthesized with a sol-gel process on the supporter of silica nanospheres. The BPA-imprinted silica nanospheres were characterized by scanning electron microscope, dynamic adsorption, static adsorption tests and molecular selectivity tests. Scatchard analysis revealed that two classes of binding sites were formed in the imprinted polymers, the equilibrium association constant and the apparent maximum number of binding sites were estimated to be 0.20 μmol•ml-1 and 137.55 μmol•g-1, respectively. Bisphenol A and three analogues, tetrabromobisphenol A (TBBPA), bisphenol C (BPC) and nonylphenol (NP) were employed for selectivity tests. The results indicated that the imprinted polymers exhibited excellent selectivity and specificity toward bisphenol A.

Abstract: In this paper, we focus on the possibility for Oil Palm Empty Fruit Bunch (OPEFB) Biomass Utilization by experimenting with chemi-refiner mechanical pulping (CRMP). To understand the process of CRMP, a short description of five comparable experiments and effects of refiner plate dam on coarse pulp properties is given. Plate dams offer a chance to utilize different alternatives needed to defibrate OPEFB and develop fiber in a more efficient way. From the experimental results, we also assume the possibility of a refining mechanism of defibration by friction of fiber to fiber interaction occurring mainly at the primary stage high consistency refining; the second stage is for fiber properties development by fibrillation at medium consistency. The effect of the undammed refiner plates is cutting more than fibrillation at high consistency, and fibrillation more than cutting at mid-consistency; The effect of the dammed plates is more friction than cutting at high consistency and more fiber fracture at medium consistency.

Abstract: The effects of chemical reaction and thermal-diffusion mixed convection heat and mass transfer for Hiemenz flow through porous media has been studied. The plate is embedded in a uniform porous medium in order to allow for possible fluid wall suction or blowing and has a power-law variation of both the wall temperature and concentration. We used similarity solution to transform the system of partial differential equations, into a boundary value problem of coupled ordinary differential equations. We then solve these ordinary differential equations by a MATLAB routine bvp4c. We conducted a parametric study of all involved parameters and the results represented graphically.

Abstract: The adhesion strength of Diamond-like carbon (DLC) deposited onto silicon substrates using an arc-pulse sputtering technique was studied by experiments and numerical simulations. A scratch test was used to detect the adhesion strength of the DLC coating, which was simplified by two processes of tearing and peeling for FEA. The numerical simulations were performed by ABAQUS to calculate the two processes and integrate the result. The FEM simulation results fit with the scratch test. It is concluded that the simulation method is effusive and can be adopted to calculate the adhesion strength of DLC coating on the silicon substrate structure in other cases.