Hi,<\/p>\n
I am trying to impose a rotation of the deformable part around an arbitrary axis for prepositioning before an impact.<\/p>\n
I know that this can be done using *BOUNDARY_PRESCRIBED_MOTION_RIGID_ID if I switch the part to rigid and then manually force its CG to be at the desired centre of rotation by using *PART_INERTIA. However, I need the part to stay deformable for the simulating an impact after the initial prepositioning.<\/p>\n
My potential workaround is to create a *CONSTRAINED_NODAL_RIGID_BODY_INERTIA using the nodes of the deformable part that I want to rotate so that I can leave the original underlying part deformable and impose the an arbitrary CG location of the overlaid CNRB. Based on the LS-DYNA manual, a rotation imposed to this CNRB through *BOUNDARY_PRESCRIBED_MOTION_RIGID_ID will occur around the CG defined through the manual inertia assignment to the CNRB.<\/p>\n
<\/p>\n
However, the rotation imposed to this CNRB still occurs around the original CG of the CNRB and not the node used to manually impose its new inertia properties.<\/p>\n
Is this due because LS-DYNA gives priority to the inertial properties of the underlying deformable parts? Or is it a bug in the code?<\/p>\n
Any suggestion to make it work would be helpful.<\/p>\n","protected":false},"template":"","class_list":["post-311345","topic","type-topic","status-closed","hentry","topic-tag-boundary-conditions","topic-tag-ls-dyna"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t