Brittle fracture is normally analysed using Linear Elastic Fracture Mechanics (LEFM). List down the parameters which are used in the analysis. (2 marks) (b) A truss frame consists of members AB, BC and AC which are made of 25 mm diameter rods. All the joints are pinned. The joint A is pinned to a wall and the joint B is set into a roller which is free to move vertically. The frame supports a point load, P, which is applied at C, as shown in Figure Q5. If the modulus of elasticity of all structures is 210 GPa, yield stress is 200 MPa and factor of safety against buckling is 2.5; (i) Determine the allowable load P that can be supported without causing buckling. Use the Euler buckling theory in your analysis. (7 marks) (ii) If the material, type of joint and lengths of the members cannot be modified, suggest a method to strengthen the critical member against buckling. (1 mark) P 1.5 m Figure Q5 A B # 1.5 m 0.5 m