Plastic Behaviour of Material

Abstract

A property of various metals that describes their ability to undergo permanent stains is called plasticity. The uniaxial tension test is a convenient method to indicate plastic behaviours of a material. A curve for typical material — soft steel in the system nominal stress-Cauchy strain presented in Fig. 6.1 indicates the following characteristic points: 1: proportional limit; 2: elastic limit; 3: yield point; 3–4: platform of ideal plasticity; 4–5: plastic hardening; 5: necking point; 6: rupture point. The typical curve shown does not describe the character of stress-strain curves for other materials.