5. You need to design a beam cross-section to minimize weight. The beam is loaded as shown and cannot deflect more than 4 mm. Based on the operating conditions, you

have already select Ti64 (E= 100 GPa) as your material and have identified the minimum web thickness as 5 mm. What is the minimum weight of your beam? Other material properties are: o, = 980 MPa, Tmax = 480 MPa, p =4.42 g/cc. Hint: QNA = A*YNA: (10pts)