Question 2/18 marks] 1) Draw a conventional stress-strain curve for mild steel and indicate yield strength, ultimate strength. and fracture strength on the curve 2) What is the main difference between ductile and brittle materials? [3] [3] 3) The rigid lever arm is supported by two A-36 steel wires having the same diameter of 6 mm. If a force of P=4 kN is applied to the handle as shown. (a) Determine the force developed in both wires and [12] (b) Determine the tilt angle (in degree) of ACE. Consider A-36 steel as an elastic-perfectly plastic material (E-200 GPa). 300 mm 450 mm 150 mm 150 mm 30 E B. D