EML 4230 Introduction to Composite Materials Chapter 2
- Slides: 43
EML 4230 Introduction to Composite Materials Chapter 2 Macromechanical Analysis of a Lamina 3 D Stiffness and Compliance Matrices Dr. Autar Kaw Department of Mechanical Engineering University of South Florida, Tampa, FL 33620 Courtesy of the Textbook Mechanics of Composite Materials by Kaw
Lamina and Laminate FIGURE 2. 1 Typical laminate made of three laminas
Compliance Matrix [S] for General Material
Stiffness Matrix [C] for General Material Stiffness matrix [C] has 36 constants
Compliance Matrix [S] for Isotropic Materials
Stiffness Matrix [C] for Isotropic Materials
Compliance Matrix [S] for Isotropic Materials
Stiffness Matrix [C] for Isotropic Materials
Compliance Matrix [S] for Anisotropic Material
Stiffness Matrix [C] for Anisotropic Material Stiffness matrix [C] has 36 constants
Compliance Matrix [S] for Anisotropic Material
Stiffness Matrix [C] for Anisotropic Material
Monoclinic Materials FIGURE 2. 11 Transformation of coordinate axes for 1 -2 plane of symmetry for a monoclinic material
Monoclinic Materials FIGURE 2. 12 Deformation of a cubic element made of monoclinic material
Monoclinic Materials FIGURE 2. 13 A unidirectional lamina as a monoclinic material with fibers arranged in a rectangular array
Compliance Matrix [S] for Monoclinic Materials
Stiffness Matrix [C] for Monoclinic Materials
Compliance Matrix [S] for Monoclinic Materials
Stiffness Matrix [C] for Monoclinic Materials
Orthotropic Materials FIGURE 2. 14 Deformation of a cubic element made of orthotropic material
Compliance Matrix [S] for Orthotropic Materials
Stiffness Matrix [C] for Orthotropic Materials
Compliance Matrix [S] for Orthotropic Materials
Stiffness Matrix [C] for Orthotropic Materials
Transversely Isotropic Materials FIGURE 2. 15 A unidirectional lamina as a transversely isotropic material with fibers arranged in a rectangular array
Compliance Matrix [S] for Transversely Isotropic Materials
Stiffness Matrix [C] for Transversely Isotropic Materials
Compliance Matrix [S] for Transversely Isotropic Materials
Stiffness Matrix [C] for Transversely Isotropic Materials
Compliance Matrix [S] for Isotropic Materials
Stiffness Matrix [C] for Isotropic Materials
Compliance Matrix [S] for Isotropic Materials
Stiffness Matrix [C] for Isotropic Materials
Independent Elastic Constants Material Type Independent Elastic Constants Anisotropic 21 Monoclinic 13 Orthotropic 9 Transversely Isotropic 5 Isotropic 2
Plane Stress Assumption Upper and lower surfaces are free from external loads FIGURE 2. 17 Plane stress conditions for a thin plate
Reduction of Compliance Matrix in 3 D to 2 D for Orthotropic Materials Compliance Matrix
Reduction of Stiffness Matrix in 3 D to 2 D for Orthotropic Materials
END
15 unknowns
15 equations EQUILIBRIUM
15 equations STRESS-STRAIN
15 equations COMPATIBILITY
END
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