The following data were collected from a test specimen of cold-rolled and annealed brass. The specimen had an initial gage length l0 of 35 mm and an initial cross sectional area A0 of 10.5 mm2?

(a) Plot the engineering stress-strain curve and the true stress-strain curve. Since the instantaneous cross-sectional area of the specimen is unknown past the point of necking, truncate the true stress-true strain data at the point that corresponds to the ultimate tensile strength. Use of a software graphing package is recommended.
(b) Comment on the relative values of true stress-strain and engineering stress - strain during the elastic loading and prior to necking.
(c) If the true stress-strain data were known past the point of necking, what might the curve look like?
(d) Calculate the 0.2% offset yield strength.
(e) Calculate the tensile strength.
(f) Calculate the elastic modulus using a linear fit to the appropriate data.

Transcribed Image Text:

Load 327 462 797 1350 1720 2220 2690 2410 A1 (mm 0.0000 0.0112 0.0157 0.0199 0.0240 1.72 5.55 8.15 13.07 22.77 (maximum load) 25.25 (fracture