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Elongation at break

In materials science, the elongation at break characterises the deformation capacity of a material in the plastic range up to when it breaks. The elongation at break describes the permanent change in length when a sample rod breaks and is therefore defined as the quotient resulting from the sample extension at the time of the break and the initial length. In order to obtain comparable values, proportional bars are used of which the length is in a fixed ratio to the cross section. The elongation at break is generally determined using a tensile test in accordance with DIN EN ISO 6892. Since the elastic part of the elongation decreases immediately after the break, the elongation at break is made up of uniform elongation and so-called necking.

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