Secondary III • 3yr.
How do we distinguish between elastic deformation, plastic deformation and rupture?
How do we distinguish between elastic deformation, plastic deformation and rupture?
Explanation from Alloprof
This Explanation was submitted by a member of the Alloprof team.
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These three concepts are all three effects of constraints, that is, the consequences of the effects of forces.
First, when an object is deformed, it changes shape or size, but is not broken. There are two types of deformation:
• Elastic, or temporary, deformation is a temporary change in the shape or dimensions of an object. For example, a balloon that is inflated and deflated will return to its initial dimensions after its expansion.
• Plastic, or permanent, deformation is a permanent change in the shape or dimensions of an object. For example, a spring that is stretched too much will remain a little more stretched than before, without breaking.
Then, when an object is broken, it is called a rupture. One distinguishes the rupture of the plastic deformation with the rupture threshold: beyond this limit, it acts of a rupture, whereas below this limit, it acts of a permanent deformation.
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