XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX''"> Introduction to Modification
The purpose of modification is to change one or more attributes of nodes, elements, and or MPCs which have been created, using one of the Create options in the Finite Element application.
Node modify options can affect the ID numbering, location, or the associated analysis and reference coordinate frames of an individual node or a group of nodes.
Element modify options can affect ID numbering, element topology (linear or higher order), or nodal connectivity (manual assignment or reversal of current connectivity).
Bar modify can split a bar element in two.
Tria modify can split a tria element into a pattern of two to four elements.
Quad modify can split a quad element into a pattern of two or four elements or NxM quad elements.
The MPC modify option can be used to add, modify, or delete terms of a currently existing MPC. Attributes of a term that can be modified include the sequence, coefficients, nodes, and the degrees-of-freedom.
Mesh modify, mesh smoothing is an iterative algorithm that can be used to optimize the shape of elements in an existing finite element mesh. Two principle uses for this feature are:
1. To more mesh nodes to the locations of “hard points” and then smooth the modified mesh. Hard points might be the locations of attachments or boundaries of holes.
2. Alter the default setting of a mesh smoothing parameter and then re-smooth the mesh. (Any transition mesh is smoothed automatically when originally created. In most cases, the default parameters yield an acceptable mesh.)
Mesh Seed modify allows the user to modify mesh control from one type to another without having to delete the old one and create a new one in place of the old one. This feature is particularly useful when user needs a node at a certain location when the edge has already been seeded with a certain type.