Abstract
This paper presents the determination of the interlaminar stresses close to the free edges of general cross-ply composite laminates based on higher order equivalent single-layer theory (HESL). The laminates with finite dimensions were subjected to a bending moment, an axial force, and/or a torque for investigation. Full three-dimensional stresses in the interior and the boundary-layer regions were determined. The computed results were compared with those obtained from Reddy’s layerwise theory. It was found that HESL theory predicts precisely the interlaminar stresses near the free edges of laminates. Besides, high efficiency in terms of computational time is obtainable when HESL theory is used as compared with layerwise theory. Finally, various numerical results were presented for the cross-ply laminates. Also design guidelines were proposed to minimize the edge-effect problems in composite laminates.
Highlights
Laminated composite materials are being used in several industries due to their high strength-to-weight ratio and stiffness-to-weight ratio
The higher order shear deformation plate theory (HSDT) is introduced in the present method to remove the shear correction factors and improve the accuracy of transverse shear stresses
The used mechanical and physical properties of the layers are presented in Table 1 [24]
Summary
Laminated composite materials are being used in several industries due to their high strength-to-weight ratio and stiffness-to-weight ratio. The first numerical method to solve the 2D governing elasticity equations is given by Pipes and Pagano [1] They utilized a finite-difference technique to establish the interlaminar stresses in a long symmetric laminate under uniform axial strain. HESL theory is used to analytically study the interlaminar stresses in both finite and long cross-ply laminates subjected to a bending moment, an axial force, and/or a torque. General cross-ply laminates are subjected to the bending moment, the axial force, and/or the torque in order to accurately determine the interlaminar stresses. The purpose of the present section is to show the HESL theory with infinity number of terms which provides sufficiently accurate results for the interlaminar stresses in composite laminate. The details of the steps involved are displayed in Appendix A
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