3. The bell crank shown in Figue 3, which is equilibrium under the forces shown in the figure, is supported by a 20-mm diameter pin at D that is in double shear. a. Determine the required diameter of the connecting rod AB, given that its tensile working stress is 100 MPa. b. Determine the shear stress in the pin. A B 200mm 240mm D 60° 30 KN FIGURE 3

Part 2,3,4

The wide-flange pinned-end column shown in the figure carries two loads, a force acting at the centroid P₁ = 450kN and a force P₂ = 270kN acting at distance s = 100 mm, from the centroid. The column is an HE 240B shape with L = 4.2m, E = 200 GPa, and Oy = 290 MPa. (a) What is the maximum compressive stress in the column?

W A L Test beam Strain gauge (a) Unsymmetrical cantilever beam with weight applied at the free end and at the "shear centre", so that there is no torsion induced. Section A-A Strain gauge 1 b Strain gauge 3 Strain gauge 2 B (b) Location of Huggenberger strain gauges a Referring to the above figure, calculate the location of the centroid, the second moments and product of area for the cross-section if; • D = 67 mm B = 41 mm t = 2.41 mm. From these, calculate the position and orientation of neutral axis for pure bending in the vertical plane (i.e. bending about a horizontal axis). Also calculate the directions of the principal second moments of area. Next, graph as scale diagram of the cross-section and plot the neutral axis on that diagram in the correct location and indicate the direction of deflection for the same conditions