Question

Suppose that you have a metal paper clip that you bend over and over in the same spot. Draw a stress-strain plot for this experiment and label each part of the curve with its rheological phase or property. Describe what happens during the experiment in terms of stress you apply, strain achieved, and what the metal is doing internally to heal itself during the process. Name the term for this process and describe how it is used historically and today to forge metal.

Answer 1

here is the graph below. the different parts of the graph are like that

proportional limit

From the origin O to the point called proportional limit, the stress-strain curve is a straight line ,within the proportional limit, the stress is directly proportional to strain .

Elastic Limit
The elastic limit is the limit beyond which the material will no longer go back to its original shape when the load is removed, or it is the maximum stress that may e developed such that there is no permanent or residual deformation when the load is entirely removed.

Yield Point
Yield point is the point at which the material will have an appreciable elongation or yielding without any increase in load.
Ultimate Strength
The maximum ordinate in the stress-strain diagram is the ultimate strength or tensile strength.

Rapture Strength
Rapture strength is the strength of the material at rupture. This is also known as the breaking strength.