Ply Mechanics

Ply Mechanics is the main page for chapter 5, where all the coordinate transformations can be computed. Here you can look at stiffness and compliance of a lamina in any coordinate system (CS), i.e., lamina, ply, layer, laminate, or your own defined CS. This applies to 2D plane stress equations and 3D orthotropic equations. Lamina analysis uses the lamina material properties calculated with micromechanics to build the threedimensional (3D) stiffness and compliance matrices. From them, it builds the two dimensional (2D) reduced stiffness and compliance matrices, in lamina coordinate system (cs). Lamina analysis also is able to transform these matrices to any other coordinate system. This is necessary since laminated composites are often manufactured using several orientations. Lamina analysis uses the lamina material properties calculated with micromechanics to build the three dimensional (3D) stiffness and compliance matrices. From them, it builds the two dimensional (2D) ''reduced'' stiffness and compliance matrices, in lamina coordinate system (cs). Lamina analysis is able to transform these matrices to any other coordinate system. This is necessary since laminated composites are often manufactured using several orientations. Lamina types include:

• Unidirectional. The lamina properties are calculated using micromechanics
• Random, continuous/chopped strand mat. The lamina properties are calculated using micromechanics
• Fabric/textile. The lamina properties are calculated using micromechanics
• Experimental. The lamina properties are given by the user, based on testing or material supplier data

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