ME 2733 Chapter : 2016 Quiz 5
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Instructions: all responses must be legible (clearly written), print your name, student # and your answers. If you do not know your student #, leave the space blank: for each question, select and record the best answer. The correct answer for 2 is e; however, a was also accepted. 1 thickness 0f foil = x diffusivity (d) 2 (c(x) - c0)/(cs - c0) = 1 - erf((z) erf(z) = 1 - (c(x) - c0)/(cs - c0) 2016-09-28 z = x /( 2 x (d x t)1/2. L at yield = (0. 2% / 100) x gage length. 2016-09-28: the diffusion coefficient (d) for hydrogen in bcc iron at 650 c is 7x10-4 cm2/sec. In order to meet the design specifications, the carbon content of the steel must reach a concentration of 0. 30 wt% at a position of 5 mm below the surface of the gear.
