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The strain identified by this test is defined by elongation with respect to a reference length. For example, a length of abbr=on 80 is used for the standardized uniaxial test of flat specimens, pursuant to EN 10002. Deformation is homogeneous up to uniform elongation. Strain subsequently localizes until fracture occurs. Fracture strain is not an engineering strain since distribution of the deformation is inhomogeneous within the reference length. Fracture strain is nevertheless a rough indicator of the formability

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