![]() Necking is the localised concentration of strain in a small region of the material, causing a reduction in cross sectional area at this point. ![]() Engineering stress assumes that the area a force is acting upon remains constant, true stress takes into account the variation in the cross sectional area as a result of the stress induced deformation (strain) of a material.įor example a steel bar in tension once it's yield point or stress is reached will start to "neck".
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