So the derivative of this curve right over here, or the function represented by this curve is gonna start off reasonably positive right over there. At this point, the derivative is gonna cross zero, 'cause our derivative is zero there, slope of the ta

The true-stress-true-strain curve of metals such as austenitic stainless steel, which deviate markedly from Eq. (10) at low strains, can be expressed by where e K is approximately equal to the proportional limit and n1 is the slope of the deviation of str

A typical stress-strain curve is shown in Figure 1. If we begin from the origin and follow the graph a number of points are indicated. Figure 1: A typical stress-strain curve Point A: At origin, there is no initial stress or strain in the test piece. Up t