Flat-Joint Model Properties

The properties of the Flat-Joint Model model are shown below for reference. More detailed information regarding these properties is presented here.

Note

Read-only properties are indicated by (r) at right in this listing.

flatjoint

fj_area f (r)

\(A^{(e)}\) - area of element \((e)\).

fj_cen v (r)

\(x^{(e)}\) - centroid location of element \((e)\).

fj_coh f

\(c\) - cohesion in units stress with default value 0.0.

fj_cohres f

\(c_r\) - residual cohesion in units stress with default value 0.0.

fj_egap f (r)

\(g^{(e)}\) - gap at centroid of element \((e)\).

fj_elem i

\(e\) - set element ( \(e\) ) to i with default value 1.

fj_emod f (r)

\(E^*\) - effective modulus.

fj_fa f

\(\phi\) - friction angle in units degrees with default value 0.0.

fj_force v (r)

\(\tilde{{\mathbf F}}\) - interface force.

fj_fric f

\(\mu\) - friction coefficient with default value 0.0.

fj_gap f (r)

\(g_s\) - surface gap.

fj_gap0 f (r)

\(g_0\) - initial surface gap.

fj_kn f

\(k_n\) - normal stiffness in units stress/disp. with default value 0.0.

fj_kratio f (r)

\(\kappa^*\) - normal-to-shear stiffness ratio.

fj_ks f

\(k_s\) - shear stiffness in units stress/disp. with default value 0.0.

fj_moment v (r)

\(\tilde{{\mathbf M}}\) - interface moment.

fj_mtype i (r)

initial microstructural type.

fj_nal i (r; 3D ONLY)

\(N_\alpha\) - number of elements in circumferential direction.

fj_nr i (r)

\(N_r\) - number of elements in radial direction (total number of elements in 2D).

fj_radius f (r)

\(R\) - flat-joint radius.

fj_relbr v2 (r)

\({\pmb \theta}_{\mathbf b}\) - relative bend-rotation as a 2D vector.

fj_resmode i

\(M_r\) - residual cohesion mode. If \(M_r = 0\), the shear stress drops to zero. If \(M_r = 1\), the shear stress drops to the residual value.

fj_rmul f (r)

\(\lambda\) - radius multiplier.

fj_shear f (r)

\(\tau_c^{(e)}\) - shear strength in units stress at centroid of element \((e)\).

fj_sigma f (r)

\(\sigma^{(e)}\) - normal stress at centroid of element \((e)\).

fj_slip b (r)

\(s^{(e)}\) - slip state of element \((e)\).

fj_state i (r)

\(B^{(e)}\) - bond state of element \((e)\).

fj_tau f (r)

\(\tau^{(e)}\) - shear stress at centroid of element \((e)\).

fj_ten f

\(\sigma_c\) - tensile strength in units stress with default value 0.0.

fj_track b

tracking state for use when plotting contacts with the specific numeric value with default value false.

user_area f

\(A\) - set contact area to the constant value f.