From Equation 8.19, if the logarithm of s is plotted versus the logarithm of , then a

Question:

From Equation 8.19, if the logarithm of εÝs is plotted versus the logarithm of σ, then a straight line should result, the slope of which is the stress exponent n. Using Figure 8.31, determine the value of n for the S-590 alloy at 925°C, and for the initial (i.e., lower temperature) straight line segments at each of 650°C, 730°C, and 815°C.