Stress-strain curves of two material specimens, A and B are shown below Indicate

Question

Stress-strain curves of two material specimens, A and B are shown below Indicate which material has higher Young's Modulus, fracture toughness, yield strength, ultimate tensile strength ductility, resilience, plastic strain (amount of permanent damage) at necking. Which is more likely to be a metal? Which is more likely to be a ceramic? If A and B were the same material with the same composition, what factors could alter their stress-strain behavior as seen above. List at least two factors. (a) (b) (c)

Explanation / Answer

(a) Youngs Modulus A (Slope of curve)

Fracture toughness B (area under the curve)

Yield strength A ( point where the yielding start)

Ultimate tensile strength A (point where necking start)

Ductilty B ( having tendency to deform plastically)

Resilence A ( area under the curve in elastic region)

Plastic Strain B ( having plastic deformation)

(b) B will be more likely to be a metal because generally metals are ductile in nature which has tendency to deform after yield point.

(c) Carbon content will differ the behaviour of curve. Higher the carbon content, more will be slope of graph and more will be brittleness nature.

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