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Chapter 3: Mechanical Properties of Materials
M3.1: The Tension Test
Unload/Reload Behavior
State the Problem
Table of Contents
Tension Test Setup
Measurements
Conducting the Test
Unload/Reload Behavior
Stress-Strain Curve From Load-Deformation Curve
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The figure on the right shows a test specimen fixed between upper and lower grips. The knife edges of an extensometer contact the specimen at two points. The load on the specimen is 13,230 pounds and the elongation is 0.0924 inches. A graph is shown on the left and a caption above the graph reads: Let’s pause here to unload the specimen. Note that the load at this point is 13,230 pounds. Click the forward button to proceed. The graph plots the load in pounds versus the deformation in inches. The vertical axis ranges from 0 to 16,000 pounds and the horizontal axis ranges from 0 to 0.5 inches. The graph starts from the bottom left at the origin, goes up and to the right with very high steepness till the point (0.025, 12,000). The graph then goes up and to the right with constant steepness till (0.0924, 13,230).
