These are nonlinear elastic materials for which the slope of the stress-strain curve, (ds/de) e, is the strain dependent ... after which the material plastically deforms. A brittle material fractures ...

Did you know that the typical stress-strain curve obtained from a uniaxial tensile test is just an approximation? It doesn't ...

In brittle materials the ultimate tensile strength is close ... test and recording the engineering stress versus strain. The highest point of the stress–strain curve is the ultimate tensile strength ...