For 10 points, name this type of deformation in which the material is deformed permanently, the opposite of elastic deformation.
The Ludwig-Hollomon equation describes how much a material can harden due to this process. The equivalent stress is used in the Prandtl-Reuss flow rule for one type of material undergoing it. At least five independent slip systems are required for this process to occur according to the von Mises criterion. This process is often a result of crystallographic slip processes. The simplistic (*) Tresca criterion states that it occurs when shear stress achieves a minimum value. During this process, the stress-strain curve is no longer linear, and it is described by distortion energy theory. This process occurs before the material ruptures and after the yield point. For 10 points, name this type of deformation in which the material is deformed permanently, the opposite of elastic deformation.
The Ludwig-Hollomon equation describes how much a material can harden due to this process.
plastic deformation or flow [accept plasticity; accept word forms]