Applied Mechanics and Materials Vol. 680

Abstract: The paper deals with the properties of a special mortar using a Waste Paper Sludge Ash (WPSA) from Waste Paper Recycling Industry and Bottom Ash (BA) from Coal Electric Power Stations. Special mortar with some advantages is proposed to give a significant impact for replacing of normal cement mortar. The advantages are approached due to the problem that occurred from collecting raw material such as pollution problems and environmental impact issues. Besides, the raw material sources of cement and sand is limited and this issue engages with the ideas to produce new material in mortar and masonry engineering. A total 72 cubes mortar is cast and determined their properties of chemical and mechanical. The properties of special mortar are compared with other special mortar made of other waste material. The compression strength of special mortar is conducted at the age 3, 7, 28 and 40 days of curing. From the result of chemical properties, it showed that the special mortar created the high compression strength value for all mixes. The compression strength of special mortar is increased by increasing the percentage sand replacement by BA. But, the compression strength is decreased when WPSA is increased. Finally, the special mortar with 100 % BA and 10 % WPSA showed the appropriate proportion for producing special mortar.

Abstract: Composite patch adhesively bonded repair is an advanced repairing method for damaged metallic structure, and in patch designing, it is important to choose appropriate geometrical parameters, which decides mechanical properties of repaired structure. Based on 3D FEM, the model of aluminum plate with a central through crack adhesively bonded repaired with carbon/epoxy composite patch was established, which can take into account residual thermal stress and bending deformation caused by differences of thermal expansion coefficient. SIF was calculated using virtual crack closure technology and compared to evaluate effects of patch geometrical parameters on mechanical properties of repaired structure. The results show that there is optimal patch length and thickness which can make best repairing effect and an effective patch width can reduce SIF significantly, beyond which it is helpless.

Abstract: The industrial revolution has significantly increase the discharge of wastewater into water bodies with heavy metals. In this study, watermelon rind was used as a biosorbent. Wastewater from mosaic industry was characterized by using flame AAS and zinc was found to have concentration range of 350mg/L to 450mg/L. Watermelon rind was characterized by using XRF and SEM. The results from XRF before biosorption shows the presence of Si to enhance biosorption. Zinc present after biosorption. The optimum pH, biosorbent amount, zinc concentration and contact time were found to be pH8, 1.5g, 400mg/L, and 30minutes respectively. The watermelon rind was proven as an effective biosorbent for zinc removal from aqueous solution

Abstract: Heavy metals pollution in wastewater from agriculture and industrial waste has been a great concern due to their toxic condition and adverse effect to the environment and human life. One of the treatment of heavy metals through biosorption. In this study, zinc is the highest concentration heavy metal in mosaics wastewater with 350 - 450 mg/L and thus, it has been selected for further study for heavy metals removal. Honeydew rind was used as biosorbent material to remove zinc in the wastewater. Characterization and optimization study were carried out. The optimum condition for pH, biosorbent amount, concentration of wastewater and contact time are at pH 6, 1.5g adsorbent, 400 mg/L zinc and 30 minutes contact time respectively 63% zic removal. This finding indicates that honeydew rind is effectively acted as biosorbent in biosorption process for removing zinc from wastewater.

Abstract: A new de-icing method is proposed based on the traveling wave piezoelectric theory, which is to remove residual ice on the fix points of the aircrafts. Testing equipment is designed as the following steps. Firstly, without piezoelectric ceramics, modal analysis of the testing skin which the dimension is 270×90×1.5 mm is completed to confirm the position of the piezoelectric ceramics. The piezoelectric ceramics are adhered to the testing skin with the maximum strain of the bending modes which the frequencies along X and Y direction are close to each other based on the above modal analysis. Then, the harmonic response analysis of the testing skin with ceramics is carried out to study the available excitation frequency in which the skin can travel looply. Finally, the equipments are fabricated to verify the numerical simulations. It is obtained that the excitation frequency to form the traveling wave is from 5099 to 5121 Hz. The input voltage passes 400 V can de-ice when the adhesive strength is set as 2 MPa in von Mises yield criterion. If the refrigerated ice is similar to the aerial ice, it is easily removed by the experimental equipments. However, it is required to further the research because this de-icing technique is still in its infancy.

Abstract: The designing of composite structures for modern and precision application is complicated due to its anisotropic and inhomogeneous material behaviour. Therefore, reliable methodology for fully predicting the performance of composite structures must be developed. Hence, analytical and numerical solution will be implemented in order to perform failure analysis of composite laminates under biaxial loading. There are many approaches developed in order to study the failure behaviour of composites materials. This paper reviews and proposes a research framework that employs analytical method, numerical method using MATLAB programming and finite element method using ANSYS 14.0 to investigate the failure behaviour of composite structures. The First Ply Failure (FPF) and Last Ply Failure (LPF) analysis will be performed to determine the failure curves. Finally, the failure curves obtained from both analytical and finite element simulation will be compared with results published from previous experiments.

Abstract: According to the existing specifications, design shallow embedded column foot of 500kV self-supporting partially prestressed reactive powder concrete pole, and perform numerical simulation of column foot stress under actual working condition by using finite element analysis software ANSYS WORKBENCH. The main research is capitals load-displacement curve, changes in stress along the height, plane section, the change in cross section of the stress problems between adjacent. The results show that shallow embedded column foot has good mechanical properties. It can well transmit larger axial pressure, pulling resistance and horizontal force generated by top load of RPC pole. Shallow embedded column foot in operation conditions higher safety level, can be used in 500kV transmission line.

Abstract: The effects of large-span truss geometry of the double-plane stable orthogonal design. The use of finite element analysis software Midas double space truss were linear buckling analysis and nonlinear buckling analysis, research process and through its buckling load - examine issues outside of the structure of the plane stable displacement curve. For double truss draw some outside reference plane stability study conclusions.

Abstract: According to the existing specifications, devise door type double pole of 500kV centrifugal concrete filled thin-wall steel tubular structures, and use the finite element analysis software ANSYS to simulate the pole.The results show that the mechanical performance of door type double pole is fine, can bear the maximum bending moment of roots of the pole well.The safety degree in the long term effect under the load is high,can be used in the 500kV transmission lines. In the technical and economic aspect, construction of centrifugal concrete filled thin-wall steel tubular structures pole is convenient,cover an area of an area small,economic and reasonable.

Abstract: This paper points out the characteristics of composite shear walls with double steel plates and filled concrete and composite structure force mechanism. This paper briefly expounds the present situation of the research on the seismic behavior of composite shear walls with double steel plates and filled concrete from four aspects including structural experiments, calculating method , calculating theory and local stability, and analyzes the shortcomings in the research. After comparing many achievements, this paper puts forward several key problems in the research of seismic behavior of composite shear walls with double steel plates and filled concrete. Finally, the development of the seismic behavior of composite shear walls with double steel plates and filled concrete is prospected.