Figure S2 from Raw material optimization and stone tool engineering in the Early Stone Age of Olduvai Gorge (Tanzania)

An example load displacement (stress - strain) curve identifying the area used to calculate work (J) during a cut. The load displacement curve is depicted in dark blue, while the idealised triangle is depicted in red. The light teal shaded area is the area used to calculate work, with its peak defined by the point of cut initiation (i.e. max force).