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Plane stress

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Plane stress. z components of stress are zero . Thin plates We use plane stress for analyzing stresses in the skins of wings. But they are subject to pressure loads, hence . How come?. It is not plane strain!. The strain in the z direction is not zero. We had . So - PowerPoint PPT Presentation

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Plane stress • z components of stress are zero . Thin plates • We use plane stress for analyzing stresses in the skins of wings. But they are subject to pressure loads, hence . How come? 0 0 yx x xy y x y x y

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Plane stress

Plane stress

It is not plane strain!

Hookes law

Single isotropic layerUniaxial loading

Stress and strain

Symmetrically laminated layers

A matrixSubstituting from Hookes law get

For isotropic layers

Effective moduli

Example 2.2.1

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