There are three types of materials with the properties shown below: Material #1 oy = 400...

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There are three types of materials with the properties shown below: Material #1 oy = 400 MPa E = 70 GPa p = 2.7 ton/m Material #2 oy = 750 MPa E = 210 GPa p = 7.8 ton/m Material #3 oy = 920 MPa E = 110 GPa p = 4.4 ton/m a) If an application where minimum mass and maximum bending plate strength is important, choose the most appropriate material from these three materials. The selected material of Q2a is then employed to manufacture spars and top-hat stringer reinforced panels (function of the material =160). These spars and stringer reinforced panels are then assembled to a single cell wing box which has a width of 1.8 m, an unsupported length of 0.6 m and an average depth of h=0.4m. The stringers cross-section area is assumed as the 50% of the skin panel cross-section area. b) If the applied compressive load is 150 kN and the ultimate bending moment is 180 kN. m, then determine the allowable bending stress and minimum skin thickness to according to the ultimate bending moment. c) If the ultimate torque is 200 kNm and the allowable shear stress os is 40% of the yield strength oy, then determine the minimum skin thickness t.according to the ultimate torque. There are three types of materials with the properties shown below: Material #1 oy = 400 MPa E = 70 GPa p = 2.7 ton/m Material #2 oy = 750 MPa E = 210 GPa p = 7.8 ton/m Material #3 oy = 920 MPa E = 110 GPa p = 4.4 ton/m a) If an application where minimum mass and maximum bending plate strength is important, choose the most appropriate material from these three materials. The selected material of Q2a is then employed to manufacture spars and top-hat stringer reinforced panels (function of the material =160). These spars and stringer reinforced panels are then assembled to a single cell wing box which has a width of 1.8 m, an unsupported length of 0.6 m and an average depth of h=0.4m. The stringers cross-section area is assumed as the 50% of the skin panel cross-section area. b) If the applied compressive load is 150 kN and the ultimate bending moment is 180 kN. m, then determine the allowable bending stress and minimum skin thickness to according to the ultimate bending moment. c) If the ultimate torque is 200 kNm and the allowable shear stress os is 40% of the yield strength oy, then determine the minimum skin thickness t.according to the ultimate torque.

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