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Ultimate strength estimation of composite plates under combined in-plane and lateral pressure loads using two different numerical methods

  • Ghannadpour, S.A.M. (Aerospace Engineering Department, Faculty of New Technologies and Engineering, Shahid Beheshti University) ;
  • Shakeri, M. (Aerospace Engineering Department, Faculty of New Technologies and Engineering, Shahid Beheshti University) ;
  • Barvaj, A. Kurkaani (Aerospace Engineering Department, Faculty of New Technologies and Engineering, Shahid Beheshti University)
  • Received : 2018.09.19
  • Accepted : 2018.12.31
  • Published : 2018.12.25

Abstract

In this paper, two different computational methods, called Rayleigh-Ritz and collocation are developed to estimate the ultimate strength of composite plates. Progressive damage behavior of moderately thick composite laminated plates is studied under in-plane compressive load and uniform lateral pressure. The formulations of both methods are based on the concept of the principle of minimum potential energy. First order shear deformation theory and the assumption of large deflections are used to develop the equilibrium equations of laminated plates. Therefore, Newton-Raphson technique will be used to solve the obtained system of nonlinear algebraic equations. In Rayleigh-Ritz method, two degradation models called complete and region degradation models are used to estimate the degradation zone around the failure location. In the second method, a new energy based collocation technique is introduced in which the domain of the plate is discretized into the Legendre-Gauss-Lobatto points. In this new method, in addition to the two previous models, the new model named node degradation model will also be used in which the material properties of the area just around the failed node are reduced. To predict the failure location, Hashin failure criteria have been used and the corresponding material properties of the failed zone are reduced instantaneously. Approximation of the displacement fields is performed by suitable harmonic functions in the Rayleigh-Ritz method and by Legendre basis functions (LBFs) in the second method. Finally, the results will be calculated and discussions will be conducted on the methods.

Keywords

ultimate strength;Hashin failure criteria;collocation;Rayleigh-Ritz;composite plate;Legendre-Gauss-Lobatto nodes;geometric nonlinear analysis

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