what changes in the structure of an object that allows something to permanently bend (i.e folding paper)

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what changes in the structure of an object that allows something to permanently bend (i.e folding paper)

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Plastic deformation of material. where external forces cause permanent deformation.
Elastic deformation is when the external forces aren’t above the yeild strength of the material. So the material goes back to it’s original shape without deformation.

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