This lesson covers the mechanics of fiber-reinforced polymer composite structures. It delves into the concepts of micromechanics and macromechanics, explaining how these composites are anisotropic. The lesson further discusses the concept of anisotropic elasticity and the need for 21 independent elastic constants to understand the stress-strain relationship. The lesson also explains the concept of planes of material property symmetry and how it leads to a reduction in the number of independent elastic constants required. The lesson then moves on to the macromechanics of lamina, discussing Hooke's law for 2-dimensional unidirectional lamina and the development of the stiffness and compliance matrix for a lamina. The lesson concludes by discussing the influence of fiber angles on the behavior of a lamina.

- Fiber-reinforced polymer composites are anisotropic, meaning their properties are direction-dependent.
- Understanding the stress-strain relationship in these composites requires 21 independent elastic constants.
- The existence of planes of material property symmetry can reduce the number of independent elastic constants required.
- The macromechanics of lamina involves understanding the Hooke's law for 2-dimensional unidirectional lamina and developing the stiffness and compliance matrix for a lamina.
- The fiber angles in a lamina can influence its behavior.

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