A-LevelPhysicsDeformation of solids9702/12 · May/June 2019 · Q221 Mark
The stress-strain graphs for loading and unloading four different materials are shown. Which material exhibits purely elastic behaviour?
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A[Graph A shows a loading curve that is initially linear then curves, with a different unloading curve ending at a permanent strain]
B[Graph B shows a linear loading curve that retraces perfectly on unloading, ending at zero strain]
C[Graph C shows a loading curve that is initially linear then curves, with a different unloading curve ending at a larger permanent strain]
D[Graph D shows a linear loading curve that retraces on unloading, but ends at a permanent strain (hysteresis loop)]
✓ Correct answer
B: [Graph B shows a linear loading curve that retraces perfectly on unloading, ending at zero strain]
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