1)Two aluminum alloy plates are clamped together in a bolted assembly with 9 bolts. The first plate has a thickness of 18mm and the second plate has 16mm thickness. The bolt specification is M10x1.5 ISO 9.8 (Metric series, ISO 9.8 is material class). Bolt material is steel and the bolt length is 48 mm. The joint is subject to occasional disassembly for maintenance and should be preloaded accordingly. The applied external load is equally distributed to all bolts. Calculate the maximum external load Pmax that can be applied to the entire joint without exceeding the proof strength of the bolts. (30 Points) Given Data: Proof strength for ISO 9.8 grade steel bolt is 650 MPa, Tensile stress area for bolt is 58 mm Elasticity modulus of steel is 207 GPa, Elasticity modulus of aluminum alloy is 120 GPa