**T_field#
Description#
This boundary condition is used to impose, on a node set, the displacement field given by the linear solution at a crack tip for an applied T–field.
Under plane strain conditions, the displacement field is given by:
(46)#\[\begin{split}\begin{aligned}
u_1 = \hphantom{-}T\frac{1-\nu^2}E R\cos\theta \\
u_2 = -T\frac{\nu(1-\nu)}E R\sin\theta \\\end{aligned}\end{split}\]
where \(\nu\) is the Poisson’s ratio, \(E\) the Young modulus.
Syntax#
The syntax is as follows:
**T_field nset center young poisson value [table]
- nset
name of the
NSET- center
crack tip position (2D vector)
- poisson
Poisson coefficient (double)
- young
Young module (double)
- value
basic boundary condition value (double). This represents the basic value of \(T\).
- table
table name
Example#
An example can be found in $Z7PATH/TESTS/Static_test/INP/Tfield_pe.inp.
***bc
**impose_nodal_dof cpath U2 0.
**T_field load (0.,0.) 200000. 0.3 plane_strain 100. time