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

Some properties are read only as stated below.

flatjoint

fj_area f

\(A^{(e)}\) - area of element \((e)\). This is a read-only property.

fj_cen v

\(x^{(e)}\) - centroid location of element \((e)\). This is a read-only property.

fj_coh f

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

fj_egap f

\(g^{(e)}\) - gap at centroid of element \((e)\). This is a read-only property.

fj_elem i

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

fj_emod f

\(E^*\) - effective modulus. This is a read-only property.

fj_fa f

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

fj_force v

\(\tilde{{\mathbf F}}\) - interface force. This is a read-only property.

fj_fric f

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

fj_gap f

\(g_s\) - surface gap. This is a read-only property.

fj_gap0 f

\(g_0\) - initial surface gap. This is a read-only property.

fj_kn f

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

fj_kratio f

\(\kappa^*\) - normal-to-shear stiffness ratio. This is a read-only property.

fj_ks f

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

fj_moment v

\(\tilde{{\mathbf M}}\) - interface moment. This is a read-only property.

fj_mtype i

initial microstructural type. This is a read-only property.

fj_nal i (3D ONLY)

\(N_\alpha\) - number of elements in circumferential direction. This is a read-only property.

fj_nr i

\(N_r\) - number of elements in radial direction (total number of elements in 2D). This is a read-only property.

fj_radius f

\(R\) - flat-joint radius. This is a read-only property.

fj_relbr v2

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

fj_rmul f

\(\lambda\) - radius multiplier. This is a read-only property.

fj_shear f

\(\tau_c^{(e)}\) - shear strength in units stress at centroid of element \((e)\). This is a read-only property.

fj_sigma f

\(\sigma^{(e)}\) - normal stress at centroid of element \((e)\). This is a read-only property.

fj_slip b

\(s^{(e)}\) - slip state of element \((e)\). This is a read-only property.

fj_state i

\(B^{(e)}\) - bond state of element \((e)\). This is a read-only property.

fj_tau f

\(\tau^{(e)}\) - shear stress at centroid of element \((e)\). This is a read-only property.

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.