Introduction
The FE Part is a wholly Adams-native modeling object with inertia properties and is accurate for very large deformation cases (that is, geometric nonlinearity) of beam-like structures. The FE Part differs from the linear flexible body option within Adams Flex in two significant ways: 1) it has the ability to accurately represent large deformations which the linear modes approach cannot and 2) its modeling does not require an FEA-produced file like the modal neutral file (MNF). The FE Part also differs from the beam force element in that it possesses inertia properties. The inertia properties are specified using symmetric, consistent mass matrix which remains constant. For a more detailed comparison with other methods of modeling geometric nonlinearity within Adams click
here. The FE Part has below formulation options:
■3D Beam: A three-dimensional fully geometrically nonlinear representation useful for beam-like structures. Accounts for stretching, shearing, bending, and torsion.
■2D Beam (XY, YZ, or ZX): A two-dimensional geometrically nonlinear representation useful for beam-like structures whereby the centerline of the beam can be assumed constrained to a plane parallel to the model's global XY, YZ or ZX plane. The 2D Beam can stretch or bend in plane. The 2D Beam will solve faster than the 3D Beam.
These formulation options are based on an MSC-authored adaptation of Absolute Nodal Coordinate Formulation (ANCF). The Adams FE Part implementation differs from pure ANCF primarily in that it is more like a hybrid between ANCF and geometrically exact beam theory to overcome the limitations of the conventional ANCF formulation. In this way, the new formulation doesn't suffer from the notorious "shear locking" phenomena.
The name "FE Part" is appropriate for this entity since this formulation is rooted in finite element modeling and its implementation within Adams shares the finite element modeling concept of nodes (see below).
The FE Part does not support material nonlinearity. Also, currently the FE Part is recommended to be applied only to modeling beam-like structures. Other shapes like plates/shells or solids are not currently directly supported. System linear modes analysis via Adams Linear is not currently supported for models including FE Parts nor are Adams2Nastran exports or analyses using Adams Controls.
Notes: | FE_PART contact with hollow sections is not supported. ■There is no problem if the geometry belongs to a any other PART or FLEX_BODY, only if the geometry belongs to an FE_PART and there is contact on that FE_PART then we do not support it. |