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As with stresses, strains may also be classified as 'normal strain' and 'shear strain' (i.e. acting perpendicular to or along the face of an element respectively). Strains are caused by relative displacements. Rigid body motions don't produce strains.
Additional recommended knowledge
Normal strains produce dilations without a shape-change as such.
The 'stretch' of an element over its original element length is thus:
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Normal_strain". A list of authors is available in Wikipedia.|