Dimensionless parameter controlling the shape of the force pull-out curve
$\xi_t$
Dimensionless parameter controlling the shape of the force shear displacement curve
$a_1$, $a_2$, $a_3$
Parameters defining the strength in directions between pure pull-out and pure shear
Description
This is a point connector model that couples a group of nodes on a slave sheet with a group of nodes on a master sheet.
The members in the groups are those nodes located inside the rivet, defined through location, radius and height.
At least three nodes on each side are required for a consistent transfer of forces and moments. The rivet radius is automatically
increased in case not enough nodes are located within the specified rivet geometry.
Hanssen et al. (2010) provides a detailed description of the model.
A brief description follows below.
$\xi$ is a parameter ranging from 0 to 1 and it scales the effective displacement as a function of the
direction of the displacement vector in the $(d_t,d_n)$-plane.
where $\theta = \mathrm{arctan}(d_n/d_t)$. The directional scaling is allowed to change as damage evolves.
This is done by defining the following relationship for the shape coefficient $a$:
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