Numerical Flexural Strength Analysis of Thermally Stressed Delaminated Composite Structure under Sinusoidal Loading

7th National Conference on Processing and Characterization of Materials

Hirwani, C.K.^1 ; Biswash, S.^1 ; Mehar, K.^1 ; Panda, S.K.^1

Department of Mechanical Engineering, National Institute of Technology Rourkela, Rourkela Odisha, India^1

关键词: Continuity conditions;    Delaminated composite structures;    Governing equations;    In-plane direction;    Shear correction factors;    Sinusoidal loading;    Thickness direction;    Variational principles;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/338/1/012019/pdf
DOI  :  10.1088/1757-899X/338/1/012019

来源: IOP

【 摘 要 】

In this article, we investigate the thermomechanical deflection characteristics of the debonded composite plate structure using an isoparametric type of higher-order finite element model. The current formulation is derived using higher-order kinematic theory and the displacement variables described as constant along the thickness direction whereas varying nonlinearly for the in-plane directions. The present mid-plane kinematic model mainly obsoletes the use of shear correction factor as in the other lower-order theories. The separation between the adjacent layers is modeled via the sub-laminate technique and the intermittent continuity conditions imposed to avoid the mathematical ill conditions. The governing equation of equilibrium of the damaged plate structure under the combined state of loading are obtained using the variational principle and solved numerically to compute the deflection values. Further, the convergence test has been performed by refining the numbers of elements and validated through comparing the present results with available published values. The usefulness of the proposed formulation has been discussed by solving the different kind of numerical examples including the size, location and position of delamination.