Aspecimen of steel having an initial diameter of 0.503 in was tested in tension using a gauge length of 2 in. the following data were obtained for the elastic and plastic states 2-6 plastic state elastic state area a in? load p ibf elongation in load p ibf 0.1984 8 800 0.0004 1000 0.1978 9 200 0.0006 2000 0.1963 9 100 0.0010 3 000 0.1924 13 200 0.0013 4 000 0.1875 15 200 0.0023 7 000 0.1563 17 000 0.0028 8 400 0.1307 16 400 0.0036 8 800 0.1077 14 800 0.0089 9 200 note that there is some overlap in the data. (a) plot the engineering or nominal stress-strain diagram using two scales for the unit strain e, one scale from zero to about 0.02 in/in and the other scale from zero to maximum strain (b) from this diagram find the modulus of clasticity, the 0.2 percent offset yield strength, the ulti- mate strength, and the percent reduction in area. (c) characterize the material as ductile or brittle. explain your reasoning (d) identify a material specification from table a-20 that has a reasonable match to the data compute the true stress and the logarithmic strain using the data of prob. 2-6 and plot the results on log-log paper. then find the plastic strength coefficient oo and the strain-strengthening exponent m. find also the yield strength and the ultimate strength after the specimen has had 20 percent cold work.