When a local coordinate system (CSYS) is added in Abaqus/standard a corotational formulation will be used. Without a local coordinate system (CSYS) the fixed global coordinate system is used. Thus, with a local coordinate system (CSYS) the response predicted is wrong since the subroutine for Abaqus/Standard assumes a fixed global coordinate system. The subroutine should determine if a local CSYS is defined or not an take action accordingly so that the user falls in the pit of success.
When a local coordinate system (CSYS) is added in Abaqus/standard a corotational formulation will be used. Without a local coordinate system (CSYS) the fixed global coordinate system is used. Thus, with a local coordinate system (CSYS) the response predicted is wrong since the subroutine for Abaqus/Standard assumes a fixed global coordinate system. The subroutine should determine if a local CSYS is defined or not an take action accordingly so that the user falls in the pit of success.