When migrating input files or using internal switching from Explicit to Implicit solution type, the influence of strain-rate effects, if defined for the materials used, should always be considered. If the problem is intended to be static or quasi-static during the implicit solution, it is recommended that strain-rate effects be ignored. LS-DYNA now offers a convenient way to achieve this by setting the parameter IRATE=1 in *CONTROL_IMPLICIT_DYNAMICS which works for all implicit solution types.
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