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

cr - 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

ϕ - friction angle in units degrees with default value 0.0.

fj_force v (r)

˜F - interface force.

fj_fric f

μ - friction coefficient with default value 0.0.

fj_gap f (r)

gs - surface gap.

fj_gap0 f (r)

g0 - initial surface gap.

fj_kn f

kn - normal stiffness in units stress/disp. with default value 0.0.

fj_kratio f (r)

κ - normal-to-shear stiffness ratio.

fj_ks f

ks - shear stiffness in units stress/disp. with default value 0.0.

fj_moment v (r)

˜M - interface moment.

fj_mtype i (r)

initial microstructural type.

fj_nal i (r; 3D ONLY)

Nα - number of elements in circumferential direction.

fj_nr i (r)

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

fj_radius f (r)

R - flat-joint radius.

fj_relbr v2 (r)

θθb - relative bend-rotation as a 2D vector.

fj_resmode i

Mr - residual cohesion mode. If Mr=0, the shear stress drops to zero. If Mr=1, the shear stress drops to the residual value.

fj_rmul f (r)

λ - radius multiplier.

fj_shear f (r)

τ(e)c - shear strength in units stress at centroid of element (e).

fj_sigma f (r)

σ(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)

τ(e) - shear stress at centroid of element (e).

fj_ten f

σc - 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.