This is a feature that occurs when a material is deformed in tension. If you take a Steel bar and pull it by both ends, oh, and are Superman, then there will be a region where the Deformation does not remain uniform. This results in the forming of a neck, where the Cross-sectional area decreases by a greater amount than the rest of the material.

This process is known as Necking.

Neck"ing, n.

Same as Neckmold.

 

© Webster 1913.

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