Stress Strain Curves Explained

Most stress strain curves are determined by testing coupon material in axial loading, hence stress strain curves are sometimes describe as "axial stress strain curves" because this better represents what is tested. Understanding the relation between stress and strain is one of the foundation for every stress engineer. one example of stress strain curve is shown below. the source of this figure is from Wikipedia.

the "flat top" (i.e: strain beyond point 2) is a plastic zone in which the strain is not linearly proportional to the stress.

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