**j_integral_lorenzi#
Description#
This option calculates the \(J\) integral using the method of Horst
and DeLorenzi [U7]. The implementation is
analogous to the **parks (see parks ) in its use of a virtual crack
extension. This method is more reliable (accurate, insensitive to mesh
density, and path independent) for small deformation analysis than the
output method *J described in *J . It is also valid for
axisymmetric or 3D analysis where *J is not. However, unlike that
method the **j_integral_lorenzi is limited to small deformation,
and can not calculate \(\Delta J\).
Remember that is the case of linear elasticity:
Syntax#
**j_integral_lorenzi
\(~\,~\,\) perturb (elset | tip) (name1 node_num)
\(~\,~\,~\,~\,\) % continuing with as many lines as \(G\) calculations
\(~\,\) [ tip_radius val ]
\(~\,~\,\) da (dax day)
Refer to the **parks option for a complete description of these
options.