The tensile stress-strain curve of a certain material is best represented by a saturation model, = − exp(−. a) derive an expression for the true strain at maximum load in terms of the constants a and . b) in a tension test, the maximum load occurred at an engineering strain of = 21% and the tensile strength was 350 mpa. determine the values of the constants a and for the material. [remember that the tensile strength is the maximum engineering stress.]

Afour cylinder four-stroke in-line engine has a stroke of 160mm, connecting rod length of 150mm, a reciprocating mass of 3kg and its firing order is 1-3-4-2. the spacing between cylinders is 100mm. i. show that the engine is in balance with regard to the primary inertia forces and primary 3. a and secondary inertia couples. li determine the out of balance secondary inertia force ii. propose ways of balancing this out of balance force and discuss the challenges that will arise