This lesson covers the in-depth understanding of Classical Lamination Theory (CLT) and its application in analyzing laminates. It explains the significance of each term in the ABBD matrix, which defines the characteristics of a laminate. The lesson further elaborates on the extensional stiffness matrix [A], the bending stiffness matrix [D], and the bending-extension coupling matrix [B]. It also discusses how these matrices relate to the in-plane forces, moment resultants, and curvatures of a laminate. The lesson concludes with a brief discussion on how CLT is used to determine the safety or failure of each layer in a laminate by applying appropriate failure theories.

- The ABBD matrix in Classical Lamination Theory defines the characteristics of a laminate, including its extensional stiffness, bending stiffness, and bending-extension coupling.
- The extensional stiffness matrix [A] relates the in-plane force resultant to the in-plane mid-surface strains.
- The bending stiffness matrix [D] is responsible for producing curvatures due to the resultant moment.
- The bending-extension coupling matrix [B] couples the in-plane forces to curvatures and moments to the in-plane strains.
- Classical Lamination Theory can be used to analyze laminates and determine the safety or failure of each layer by applying appropriate failure theories.

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