GeomTran_TriMemb

Purpose

kinematic matrices and local displacements for a triangular membrane element

Synopsis

[ag,ab,xl0,ul,Dul,DDul] = GeomTran_TriMemb (option,xyz,u,Du,DDu)

Description

GEOMTRAN_TRIMEMB kinematic matrices and local displacements for a triangular membrane element
  [AG,AB,XL0,UL,DUL,DDUL] = GEOMTRAN_TRIMEMB (OPTION,XYZ,U,DU,DDU)
  the function determines the kinematic matrix AG from the global to the basic reference system,
  and the kinematic matrix AB from the global to the local reference system
  as well as the local coordinates XL0, and local displacements UL and increments DUL and DDUL
  from the node displacement array U and its increments DU and DDU
  for a triangular membrane element with end node coordinates XYZ;
  OPTION is a character variable with one of two values:
  'linear' and 'corotational', for linear and corotational geometry, resp.

Cross-Reference Information

This function calls:

• DefGeom_Tri determines local coordinates and corotational triad of triangular element
• spinblk determine the spin tensors for a group of vectors

• InelCST constant strain triangle with inelastic material under plane stress/strain
• InelLST linear strain triangle with inelastic material under plane stress/strain
• LECST constant strain triangle with linear elastic material under plane stress/strain
• LELST linear strain triangle with linear elastic material under plane stress/strain