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::Necking (engineering)

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A polyethylene sample with a stable neck.

Necking, in engineering or materials science, is a mode of tensile deformation where relatively large amounts of strain localize disproportionately in a small region of the material.<ref name="bridgman">P.W. Bridgman, Large Plastic Flow and Fracture, McGraw-Hill, (1952)</ref> The resulting prominent decrease in local cross-sectional area provides the basis for the name "neck". Because the local strains in the neck are large, necking is often closely associated with yielding, a form of plastic deformation associated with ductile materials, often metals or polymers.<ref name="polymer_yield">A.J. Kinloch and R.J. Young, Fracture Behaviour of Polymers, Chapman & Hall (1995) p108</ref>


Necking (engineering) sections
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