Answer Happy

D1. You plan to produce a 0.1 inch-diameter copper wire having a minimum yield strength of 65,000 psi and a minimum elongation of 5%. The drawing will start with a fully annealed 0.3-inch-diameter rod following the steps of (cold) drawing, annealing, and then (cold) drawing. The wire must be drawn by two passes. Answer the following questions to examine the feasibility. 1) What is the %CW for the first and last passes, respectively, to reach the required properties? 2) Calculate the draw force for the last pass and check if the wire would rupture. 3) Calculate the draw force for the first pass and check if the wire would rupture. 4) Based on your analysis, is this drawing design feasible? Tensile strength Strength (psi) 100,000 90,000 80,000 70,000 60,000 50,000 40,000 30,000 20,000 10,000 Yield strength 100 90 80 70 60 50 40 30 20 10 % Elongation % Elongation 0 100 20 40 60 80 Percent cold work