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.]

Ajournal bearing has a journal diameter of 3.250 in with a unilateral tolerance of 20.003 in. the bushing bore has a diameter of 3.256 in and a unilateral tolerance of 0.004 in. the bushing is 2.8 in long and supports a 700-lbf load. the journal speed is 900 rev/min. find the minimum oil film thickness and the maximum film pressure for both sae 20 and sae 20w-30 lubricants, for the tightest assembly if the operating film temperature is 160°f. a computer code is appropriate for solving this problem.