Project ForgeWhich one of the following types of stress-strain relationship best describes the behaviour of brittle materials, such as ceramics and thermosetting plastics, (σ=stress and ε=strain)? (A) linear rise then a long constant-stress plateau; (B) linear rise, a kink, then a shallower continued rise; (C) a flat constant-stress line with no initial rise; (D) a short, steep, nearly-linear rise ending abruptly with no plateau.
- Alinear rise then a long constant-stress plateau (ductile, perfectly-plastic style)
- Blinear rise, a kink, then a shallower continued rise (strain-hardening ductile style)
- Ca flat constant-stress line with no initial rise
- a short, steep, nearly-linear rise ending abruptly with no plateau
Explanation
Brittle materials like ceramics and thermosetting plastics fracture suddenly at small strain with essentially no yielding or plastic plateau — a short, steep, nearly-linear stress-strain curve that ends abruptly at fracture, unlike ductile materials which show yielding/plateau or strain-hardening behavior.
Source: GATE ME 2015 (Session 1) (2015)
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