Hi, everyone,
I am struggling with some tough problem so come here seeking help. I am writing a self developed explicit dynamic solver (central difference method)code. it is based on the previous static procedure, so basically i didnot change much on the element formulations(Keep them fully integration). when i run cases to validate, just figure out that for some cases it is not stable or need a really small step camparing the typical defined dt=L/c (c: sound speed in the medium). Like, the case in high temperature. The element i m using is a traditional beam-column element, and all the material-based integration(stress,strain,ect.) has been proved working well in previous static procedure.
so can any one help me to identify the reason of this instability and cause of the over-tiny step? or is it not compatible to use full integration in explicit integration solver? or there is something i missed?
Thanksssss