The stiffness matrix term (“beta damping”) can, however, be interpreted as being directly proportional to the strain rate. Actually, a pure beta damping corresponds to a viscous damping with whereKandGare the elastic bulk and shear moduli, respectively. Beta damping, just as viscous damping, ...
If you just do the onloading part, it is not possible to discriminate between elastic and plastic behavior. By unloading, you can distinguish plastic from elastic behavior, but until the specimen is in a state of significant compression, it is not possible to determine whether an isotropic...
The default nodes for Solid Mechanics are: a Linear Elastic Material model, Free boundary conditions that allow all boundaries to move freely without a constraint or load, and Initial Values for specifying initial displacement and velocity values for a nonlinear or transient analysis (not applicable ...