Problem M20
A 45° strain gauge rosette attached to the surface of an aluminum alloy wing skin
panel measures the following strains:
ea = -0.0025, eb=0.0020, ec=-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?
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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