Transient Vibration Analysis of An Optimized FML Cylindrical Shell Based on Maximum Reliability

Subject Areas : Mechanical Engineering

Alireza Pourmoayed ^{1 *} , Keramat Malekzadeh Fard ² , ali nazari ³

1 - Department of Mechanical Engineering, University of Khatamul-Anbiya Air Defense, Iran
2 - Department of Structural Analysis and Simulation, Aerospace Research Institute, University of Malek Ashtar, Iran
3 - Department of Aerospace Engineering, Aerospace Research Institute, Iran

Received: 2024-09-26 Accepted : 2025-01-01 Published : 2025-04-27

Keywords: Fiber Orientation, FML Shell, Layup, Reliability, Transient Vibration,

Abstract :

The transient vibration analyses of optimised Fibre Metal Laminates Cylindrical shells were examined in this paper. One of the most innovative aspects of this study is identifying an applied trend for optimizing the FML cylindrical shell construction to achieve maximum reliability. The FML shell reliability is determined using the First Order Reliability Method (FORM) and the Hashin failure criteria. To achieve this objective, the Shell is constantly subjected to a static load, and the resulting tensions within the FML layers of the shell are measured. The maximum tension is determined using the Hashin method, and the stability of the shell is subsequently estimated.  Next, the amounts of reliability are certified according to shell stability. To maximize the FML shell reliability, the sequence of the composite-metal layers and fibre orientation are often modified, and for each case, the sample reliability is calculated. The second section of this study examines the effect of the optimized structure of the FML shells on the acceleration and displacement of these shells under dynamic loading.  The energy approach is used to obtain the Equations of motion, whereas the mode superposition method is employed for transient vibration analysis.

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