Consider the tensile stress-strain diagrams in Figure 6-28 labeled 1 and 2 and answer the following questions. These diagrams are typical of metals. Consider each part as a separate question that has no relationship to previous parts of the question?

Figure 6 - 28 Stress - strain curves for Problem 6 - 36.
(a)Samples 1 and 2 are identical except for the grain size. Which sample has the smaller grains? How d o you know?
(b) Samples 1 and 2 are identical except that they were tested at different temperatures. Which was tested at the lower temperature? How do you know?
(c) Samples 1 and 2 are different materials. Which sample is tougher? Explain.
(d) Samples 1 and 2 are identical except that one of them is a pure metal and the other has a s mall percentage alloying addition. Which sample has been alloyed? How do you know?
(e) Given the stress-strain curves for materials 1 and 2, which material has the lower hardness value on the Brinell hardness scale? How do you know?
(f) Are the stress-strain curves shown true stress-strain or engineering stress- strain curves? How do you know?
(g) Which of the two materials represented by samples 1 and 2 would exhibit a higher shear yield strength? How do you know?

Transcribed Image Text:

2 0 Strain