L6 - Quick Review Last class Poissons ratio...

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Quick Review Last class: - Poisson’s ratio, multi-dimensional effects due to axial loading, multi-axial loading - Bulk modulus, dilatation - Shear strain, Shear modulus Today: -Composite Materials - Stress concentration -Plastic deformation -Residual stress
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Composite Materials Fiber-reinforced composite materials are formed from lamina of fibers of graphite, glass, or polymers embedded in a resin matrix. z z z y y y x x x E E E ε σ ε σ ε σ = = = directionally dependent moduli of elasticity x z xz x y xy ε ε ν ε ε ν = = directionally dependent values of Poisson’s ratio Materials with directionally dependent mechanical properties are anisotropic .
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Saint-Venant’s Principle Loads transmitted through rigid plates -> uniform distribution of stress and strain.
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Saint-Venant’s Principle: Stress distribution may be assumed independent of the mode of load application except in the immediate vicinity of load application points.
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