Improved zigzag theories for laminated composite and sandwich plates with interlaminar shear stress continuity

2016 ◽  
Vol 52 ◽  
pp. 243-255 ◽  
Author(s):  
Suganyadevi Sarangan ◽  
B.N. Singh
Keyword(s):  
Shear Stress ◽  
Laminated Composite ◽  
Sandwich Plates ◽  
Interlaminar Shear Stress ◽  
Interlaminar Shear

An Interlaminar Shear Stress Continuity Theory for Both Thin and Thick Composite Laminates

1992 ◽  
Vol 59 (3) ◽  
pp. 502-509 ◽  
Author(s):  
Xianqiang Lu ◽  
Dahsin Liu
Keyword(s):  
Shear Stress ◽  
Composite Laminates ◽  
Present Theory ◽  
Transverse Shear Deformation ◽  
Elasticity Analysis ◽  
Equilibrium Equations ◽  
Composite Interface ◽  
Laminate Theory ◽  
Interlaminar Shear Stress ◽  
Interlaminar Shear

The interlaminar shear stress plays a very important role in the damage of composite laminates. With higher interlaminar shear stress, delamination can easily occur on the composite interface. In order to calculate the interlaminar shear stress, a laminate theory, which accounts for both the interlaminar shear stress continuity and the transverse shear deformation, was presented in this study. Verification of the theory was performed by comparing the present theory with Pagano’s elasticity analysis. It was found that the present theory was able to give excellent results for both stresses and displacements. More importantly, the interlaminar shear stress can be presented directly from the constitutive equations instead of being recovered from the equilibrium equations.

Influence of openings and additional mass on vibration of laminated sandwich rhombic plates using IHSDT

2018 ◽  
Vol 33 (1) ◽  
pp. 3-34 ◽  
Author(s):  
Anish ◽  
Ajay Kumar ◽  
Anupam Chakrabarti
Keyword(s):  
Shear Stress ◽  
Free Vibration ◽  
Shear Deformation Theory ◽  
Laminated Composite ◽  
Free Vibration Analysis ◽  
Mode Shapes ◽  
Fe Model ◽  
Additional Mass ◽  
Interlaminar Shear ◽  
Piecewise Parabolic

In this article, investigations on the influence of openings and additional mass on free vibration analysis of laminated composite sandwich skew plates using improved higher order shear deformation theory (IHSDT) have been done. The IHSDT model satisfies the interlaminar shear stress continuity at the layer interfaces and also ensures zero transverse shear stress conditions at the top and bottom of the plate. The piecewise parabolic shear stress variation across the thickness of each layer is considered. No shear correction factors are required. The 2-D C0 finite element (FE) model has been developed by authors based on IHSDT. FE model based on IHSDT has been coded in FORTRAN. The problem of C1 continuity requirement associated with the IHSDT is overcome using an appropriate C0 FE formulation. The free vibration frequencies of laminated composite and sandwich plates obtained using the present 2-D FE model are in good agreement with the 3-D elasticity results. The influence of the side-to-thickness ratio, skew angles, boundary conditions, and mode shapes is taken into consideration for the present study.

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