Determine the maximum shear stress acting in the fiberglass beam at the critical section 200 lb/ft 150 lb/ft 6 ft 6 ft 2 ft 0.8 in. 0.75 in. 6 in. 4 in. 0.75 in.

A 200 MPa shear stress is applied on along CD. Calculate diagonal strain along AC. Given modulus of elasticity is 120 GPa and Poisson's ratio is 0.2. 200 MPa A B Diagonal strain will be in the form of k x 10-3 Find 'k'

H.W 3 Two aluminum alloy plates (2) are attached to the sides of a wooden beam (1) as shown in Figure 3. mensions of the composite cross section are b1 = 80 mm, d¡ = 240 mm, b2 = 10 mm, d2 = b2 The di- |di 120 mm, and a = 60 mm. Deter- (2) (2) %3D mine the maximum bending (1) a stresses produced in both the wooden beam and the aluminum b1 plates if a bending moment FIGURE 3 +6,000 N m is applied M2 %3D about the z axis. Assume that Ej = 12.5 GPa and E2 = 70 GPa.