süvaplastne deformatsiooniprotsess/-operatsioon, mille korral rakendatakse suuri surve- ning samaaegselt väändejõude õhukesele (paksus tavaliselt kuni 1 mm) metallkettale (vt süvaplastne deformatsioon), process of severe plastic deformation (SPD) in which a thin disc of the material to be strained is placed between two anvils; a large compressive stress is applied while one anvil is rotated to create a torsion force (see: severe plastic deformation)