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

Abstract

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.

Multi-model finite element scheme for static and free vibration analyses of composite laminated beams

“…The results for S = 4 and 10 are compared in Table 2. Exact elasticity solution by Pagano (1969), and FE results obtained by Desai and Ramtekkar (2002), Liou and Sun (1987), Lu and Liu (1992), Manjunatha and Kant (1993b), and Shimpi and Ghugal (1999) have been presented for proper comparison. Results from the present analysis have been found to be in agreement with the established results.…”

Two-noded zigzag beam element accounting for shear effects based on an extended Euler Bernoulli theory

“…The strain- where k u ε a respectivel Assuming axes corre expressed i (7) and (9) ain and str that the ma esponding t in term of th …”

“…These theories assume that the axial displacement is the superposition of a linear piecewise zigzag distribution and a linear [6,7], quadratic [8,9] or cubic [10][11][12][13] in-plane displacement field. In the most of early zigzag theories the zigzag function is obtained by enforcing the continuity of the transverse shear stresses across the laminate thickness.…”

First-Order Displacement-Based Zigzag Theories for Composite Laminates and Sandwich Structures: A Review

“…Contrary to the ESL models, Layer-wise (LW) models [3,29,30,31,32,33,34,35,36] make a-priori assumptions on the distribution of the displacement and stress fields within each layer. Limiting the discussion to the displacement-based approach, LW models postulates a C 0 -continuous kinematics, that is a distribution of displacements (first of all, in-plane displacements) continuous along the thickness with first derivative showing a jump at layer interfaces (the reason of this discontinuity will be explained hereinafter).…”