# Solve questions from stress-strain curve

civil engineering multi-part question and need the explanation and answer to help me learn.

Find the Modulus of elasticity, Yield stress, Yield strain, Ultimate stress, Fracture stress, Fracture strain from two given stress-strain curves

Requirements: Answer all questions

Figure 1

The stress–strain diagram for a steel alloy having an original diameter of 0.5 in. and a gage length of 2 in. is given in the figure.

Figure description

A sigma-epsilon diagram. The diagram’s vertical sigma-axis is in kilo pounds per square inch and ranges from 0 to 105 in increments of 15. The diagram’s horizontal epsilon-axis is in inches per inch and ranges from 0 to 0.35 in increments of 0.05. The epsilon-axis also ranges from 0 to 0.007 in increments of 0.001. The diagram shows two curves tracing scatter plots. Graphed using the range of larger epsilon-values, the first graph is concave down as it rises from (0, 63) through (0.05, 90) to a peak at (0.20, 101) and then falls to (0.31, 80). Graphed using the range of smaller epsilon-values, the second curve rises in a straight line from (0, 0) to (0.002, 60) before becoming concave down and rising through (0.0064, 65). All points are estimated.

Figure 2

Questions

Based on each of these stress-strain curves, calculate or identify the following items:

Modulus of elasticity

Yield stress

Yield strain

Ultimate stress

Fracture stress

Fracture strain