Q: A 60 strain rosette measures the following strain at a point on the aluminum skin of an airplane. 0 = 160 10-6 m/m, 60

Q: A 60˚ strain rosette measures the following strain at a point on the aluminum skin of an airplane. ϵ0 = 160 ×10-6 m/m, ϵ60 = -220 ×10-6 m/m and ϵ120 = 360 ×10-6 m/m. Using E = 10 ×106 psi and v = 0.3, Determine the principle stresses and the maximum in-plane shear stress.