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Multiwall Rectangular Plates under Transverse Pressure-A Non-Linear Experimental and Numerical Study.
Gilad Hakim1, Haim Abramovich1
1Faculty of Aerospace Engineering, Technion-Israel Institute of Technology (I.I.T.), Haifa 32000, Israel.
This study simplifies large plate deflection analysis using a polynomial approximation. The method accurately predicts plate behavior under pressure using material properties and dimensions.
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Area of Science:
- Mechanical Engineering
- Solid Mechanics
- Materials Science
Background:
- Large deflection of rectangular plates under transverse pressure is complex, with Föppl-von Kármán equations offering only approximate solutions.
- A common approximation involves separating plate behavior into small deflection and thin membrane components, often using polynomial expressions.
Purpose of the Study:
- To derive analytical expressions for the coefficients of a third-order polynomial approximation for large plate deflections.
- To validate the derived analytical expressions through experimental testing and finite element analysis.
- To establish a predictive method for plate deflections based on elastic properties and dimensions.
Main Methods:
- Derivation of analytical expressions for polynomial coefficients based on plate elastic properties and dimensions.
- Experimental validation using a vacuum chamber loading test to measure lateral displacement of multiwall plates.
- Numerical validation through finite element analysis (FEA) of plate behavior under pressure.
Main Results:
- The third-order polynomial expression was found to fairly describe the non-linear relationship between pressure and lateral displacement.
- Experimental measurements and FEA results demonstrated good agreement with the predictions from the analytical expressions.
- The study successfully validated the polynomial approximation for predicting large plate deflections.
Conclusions:
- The developed analytical method provides accurate expressions for predicting large plate deflections under transverse pressure.
- This approach simplifies the analysis of plate behavior, requiring only known elastic properties and dimensions.
- The findings offer a practical tool for engineers to estimate plate deflections efficiently.