Materials show elastic deformation up to their elastic limit, and plastic deformation beyond it.
Deformation = elastic - material returns to original shape.
Material is put under tension - atoms of material are pulled apart from one another. Atoms can move slightly relative to their equilibrium positions without changing position. Load is removed - atoms return to their equilibrium distance apart.
Deformation = plastic - material is permanently stretched.
Some atoms move position relative to one another. Load is removed - atoms don’t return to original postitions.
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