Name the three pure modes of fracture and sketch diagrams to describe their loading and cracking directions. b) Figure Q5 shows column BE with both ends pinned to rigid members ABC and DEF, and column FG which is pinned at F and fixed at G. Both columns have a square cross sectional area of 2020 mm. Column BE is made of bronze (E = 100 GPa and d = 150 MPa) and column FG is made of aluminium (E = 70 GPa and Gyid 80 MPa). A load P is applied at C. yield 1) By using Euler's buckling theory, determine the maximum allowable load P that can be applied without causing buckling if the factor of safety against buckling is 1.5. i) Verify that the stress in each column has not exceeded the respective yield strength when the load P in (1) is applied Ao Do 500 + BOT Ed 500 + 600 500 1000 Fo All dimensions in mm Figure Q5 (3 marks) 1000 A. P (7 marks)