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Theoretical framework for DOUBLE-DOUBLE composite plates under bending loads
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DOI：10.4025/actascitechnol.v48i1.74255.png)
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Abstract
En 中文
This paper provides an insightful comparative analysis of laminated composite plates, focusing on two main stacking sequence groups: the traditional QUAD and the more recent DOUBLE-DOUBLE (DD) proposed by Professor Stephen Tsai. The investigation thoroughly explores the extensional, coupling, and bending stiffness matrices of each group, analyzing their implications for the bending behavior of laminated composite plates according to Kirchhoff's Laminate Theory under cylindrical bending conditions. The study highlights that, under this theory, increasing the repetitions of the 4-layer sub-laminates [+/-Phi/+/-psi] leads to a much greater increase in bending than in coupling stiffness, and simultaneously promotes a decrease in extension-bending (A16, A26) and bending-torsion (D16, D26) components. The finite element simulations indicate that, as the number of repetitions increases from two to eight, the reduction in out-of-plane displacement exceeds that of the corresponding QUAD configuration, making the DD configuration a promising option. Moreover, the choice of angles significantly influences the overall bending behavior, particularly affecting three key components of the bending stiffness matrix: D11, D16, and D26. Among the configurations examined, the [+/- 0/+/- 50]8 configuration emerges as the optimal DD configuration for bending applications. This specific angle combination for the [+/- 0/+/- 50] sub-laminate yields high values of D11 and near-zero values for D16 and D26, enhancing bending stiffness while minimizing coupling twist-bending. In conclusion, the findings suggest that DD configurations offer a valuable option for applications involving thick composite bending.
Keywords:
Double-double
QUAD
Kirchhoff's laminate theory
numerical simulations
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0.6
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Citations:
563
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