Question 2 Calculate the bending stress at the bottom edge of the following composite beam subject to a bending moment of M= 1500 Nm. The lower section is made from steel (F= 200 GPa) and the upper section is made from aluminium (F= 70 GPa). All dimensions are in mm. 100 YA 100 Z 10

= 12 mm. The The following figure depicts an aluminum I beam of height h = 0.25 m, width b = 0.2 m, flange thickness ta = 16 mm, and web thickness tw beam is reinforced by two layers of unidirectional composite material of thickness to = 5 mm. The section is subjected to an axial force N₁ = 500 kN. The Young's moduli for the aluminum and unidirectional composite are Ea 73 GPa and Ec 140 GPa, respectively. = (a) Compute the axial stiffness for this structure. (b) Compute the maximum axial stress in both the aluminum and composite layers. CS Scanned with CamScanner 1₁ I h t₂ I b po

Bar A-B-C is made from a fully bonded composite of two materials as shown in the cross section below. Find the Z displacement at point C. A C 1.10 m 20 kN B 1.25 m 50 kN с Y I cross section c-c Uz = 5 mm, material 1 5 mm, material 2 5 mm, material 1 25 mm Material 1 E = 240 (GPa) Material 2 E = 180 (GPa) mm (at C)