When deciding what materials to use in building something, determining how those materials respond to stress and strain is often the first task. A material's macroscopic, or bulk, properties in this area--whether it can spring back into shape, for example--is generally the product of what is happening on a microscopic scale. When stress causes a material's constituent molecules to rearrange in a way such that they can't go back to their original positions, it is known as "plastic deformation."
When deciding what materials to use in building something, determining how those materials respond to stress and strain is often the first task. A material's macroscopic, or bulk, properties in this area--whether it can spring back into shape, for example--is generally the product of what is happening on a microscopic scale. When stress causes a material's constituent molecules to rearrange in a way such that they can't go back to their original positions, it is known as "plastic deformation."
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