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Deformation (engineering)
In materials science, deformation refers to any changes in the shape or size of an object due to-
  • an applied force (the deformation energy in this case is transferred through work) or
  • a change in temperature (the deformation energy in this case is transferred through heat).
The first case can be a result of tensile (pulling) forces, compressive (pushing) forces, shearbending or torsion (twisting).

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