Yield Strength  
scene 7 of 10
The graph plots stress in p s i versus strain in inch per inch. The horizontal axis ranges from 0 to 0.1 and the vertical axis ranges from 0 to 80,000. The graph starts at the bottom left of the viewing window at the origin, goes up and to the right with constant steepness till the point (0.050, 50,000). The graph then goes up and to the right with a reduced positive slope till (0.1, 60,000). A straight line is drawn passing through (0, 0) and (0.040, 43,700) and it overlaps the linear portion of the curve. Another straight line is drawn between the points (0.02, 0) and (0.074, 56,000). A horizontal line through the point (0.074, 56,000) intersects the vertical axis at (0, 56,000). The interval from the origin to the point (0.02, 0) is marked 0.2 percent.

The stress indicated by the intersection of the offset line and the stress-strain diagram is the yield strength.

Begin on the strain axis at the specified permanent set. Construct a line parallel to the initial elastic modulus line.