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Materials 1

Stress–Strain / Mechanical Properties

QuestionAnswer
What does the slope of the elastic region on a stress–strain curve represent? Young’s modulus (E), i.e., stiffness.
What point on the stress–strain curve is the UTS? The maximum (peak) engineering stress.
The maximum (peak) engineering stress. The stress where plastic deformation begins (often found by the 0.2% offset method).
What does “yield strength” mean? Modulus of resilience (elastic energy per unit volume).
What does the area under the elastic region represent? Modulus of toughness (total energy absorbed per unit volume before fracture).
What does the total area under the stress–strain curve to fracture represent? Hardness.
What is ductility commonly measured as in tensile testing? % elongation (or fracture strain).
What is the difference between elastic strain and plastic strain? Elastic strain is recoverable; plastic strain is permanent.
When does necking begin in an engineering stress–strain curve? At the UTS (maximum engineering stress).
What two properties together largely determine toughness? Strength + ductility.
Created by: user-2027475
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