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Question: a figure 3a shows a castiron beam is acted upon...

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(a) Figure 3a shows a cast-iron beam is acted upon by a 3 kN.m couple. Knowing that the modulus of elasticity, E for cast iron is 165 GPa and neglect the effects of fillets, determine: 8 Marks 4 Marks (i) the maximum tensile and compressive stresses in the beam. (i) the stress at point Q 40 mm 15 mm d = 30 mm 20 mm Figure 3a (b) Figure 3b shows a beam having the cross section shown has been made by securely bonded brass and aluminum Based on the data given in Table 1, determine the largest bending moment when the composite bar is bent about a horizontal axis. 8 Marks Table 1 Modulus of Elasticity. E Allowable stress.o Aluminum 70 GPa 100 MPa Brass 105 GPa 160 MPa Brass 6 mm Aluminum 30 6 1 30 Figure 3b

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