plastic anisotropy

Plastic anisotropy in metallurgy refers to the property of a metal exhibiting different values when measured along axes in different directions, specifically concerning its plastic deformation. This is distinct from isotropy, where properties are uniform regardless of direction.1

In metalworking, plastic anisotropy is particularly relevant in sheet metal forming. When a sheet is stretched, its thickness and width decrease. In an isotropic sheet, these decreases are equal. However, if the metal's grains are oriented correctly, the thickness may shrink less than the width. This phenomenon, known as plastic anisotropy, improves deep-drawing properties by delaying fracture, which is often initiated by thinning.2

The crystal structure of metals influences their ductility and thus their ability to undergo plastic deformation. Face-centered cubic metals (like copper and aluminum) are generally more ductile than body-centered cubic metals, requiring processes that emphasize compressive over tensile stresses to avoid premature fracture.2