Electrical Discharge Machining, External Magnetic Field, Tools Ultrasonic Vibrations, Machined Surface Integrity

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NAZARI ALI; Malekzade Fard Keramat; NADERI ALI ASGHAR

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Journal Paper

Paper Information

Journal: Modares Mechanical Engineering Year:2018 | Volume:18 | Issue:7 Page(s): 108-118

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Information Journal Paper

Title

Electrical Discharge Machining, External Magnetic Field, Tools Ultrasonic Vibrations, Machined Surface Integrity

Author(s)

NAZARI ALI | Malekzade Fard Keramat | NADERI ALI ASGHAR | Issue Writer Certificate

Keywords

Free vibrationQ2

fiber metal laminated shellQ1

fracture criterionQ2

fiber orientationQ1

Abstract

The big deformation of composite structures under dynamic loads is one of the most disadvantages of these structures that cause to loss of stiffness of them. The using of fiber metal laminated shell that named FML in abbreviation is one of the ways to decrease the adverse effect of dynamic load. In this study the optimum fiber orientation of composite layers of the FML circular cylindrical shells are determined to more decrease the adverse effect of dynamic loads. For this purpose the fiber orientation of composite layers of the FML circular cylindrical shells are changed frequently and each cases being subjected to axial compressive load and with use of ABAQUS program the tension of all composite layers are calculated for all cases. Then with use of MATLAB program the fiber orientation that cause to maximum stiffness based on maximum tension fracture criterion is selected. The Free vibration analysis is used for determination the accuracy and performance of design process. The results of Free vibration analyses show that determination of the optimum fiber orientation cause to improvement of the FML shell natural frequency. Energy method and high order shear deformation theory is used to define the equation of motion. Full Calculus method is used for optimization in order to apply the exact result.

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