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The yield strength of a metal is the load at which the metal transits from being elastic to plastic. This load is reached at a point called yield point, however it also transits and peaks at one point, where metal exhibits total plasticity and YIELDS to the applied load. Both these points are shown in the Figure 2.1 above.

Note that there is a line at 0.2 percent offset, this value of the yield is often the engineering yield value that is used for design calculations.