m20_ps14_fall03 - b What are the in-plane principal...

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Problem M20 A 45° strain gauge rosette attached to the surface of an aluminum alloy wing skin panel measures the following strains: e a = -0.0025, e b =0.0020, e c =-0.0040 The orientation of the gauges is shown below a b c a) What are the extensional stresses in the a, b and c directions?
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Unformatted text preview: b) What are the in-plane principal stresses? The Young's modulus of the aluminum alloy is 70 GPa, the Poisson's ratio is 0.33 (note. the a, b, and c directions are numbered in the counterclockwise direction)...
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