3. The steel pipe AB has a 72 mm outer diameter and a 5 mm wall thickness. Link CDE is rigidly attached to the pipe. Point K is at the top of the pipe, at 150 mm from point D. Neglect the stress...

Extracted text: 3. The steel pipe AB has a 72 mm outer diameter and a 5 mm wall thickness. Link CDE is rigidly attached to the pipe. Point K is at the top of the pipe, at 150 mm from point D. Neglect the stress concentrations. Material is Hot Rolled Steel, with E = 207 x 10° Pa, G = 79 × 10° Pa, Sy = 200 MPa, Su = 414 MPa. The force at E is steady, with FE = 9 kN (down). The force at C is steady, with Fc = 3 kN (up). Section Properties for bar OD: IOD = 594 × 10³ mm = 594 × 10-9 m*; JoD = 1188 × 10³ mm4 = 1188 × 10-9 mª; %3D Section for bar DE: IDE 50 × 10-9 mª Determine the principal stresses at point K using Mohr circle. A 3 kN K 120 mm 9 kN 150 mm E 120 mm