# Linear Parallel Bond Model Properties

The properties of the Linear Parallel Bond 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.

linearpbond
dp_force v

$$\mathbf{F^d}$$ - dashpot force in units force. Expressed in the contact plane coordinate system. This is a read-only property.

dp_mode i

$$M_d$$ - dashpot mode with default value 0.

dp_nratio f

$$\beta_n$$ - normal critical damping ratio with default value 0.0.

dp_sratio f

$$\beta_s$$ - shear critical damping ratio with default value 0.0.

emod f

$$E^*$$ - effective modulus in units force/area. This is a read-only property.

fric f

$$\mu$$ - friction coefficient with default value 0.0.

kn f

$$k_n$$ - normal stiffness in units force/length with default value 0.0.

kratio f

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

ks f

$$k_s$$ - shear stiffness in units force/length with default value 0.0.

lin_force v

$$\mathbf{F^l}$$ - linear force in units force with default value $$\mathbf{0}$$. Expressed in the contact plane coordinate system.

lin_mode i

$$M_l$$ - normal-force update mode with default value 0 (absolute update mode). Incremental normal-force update mode is set with $$M_l$$ = 1.

lin_slip b

$$s$$ - slip state. This is a read only property.

pb_coh f

$$\overline{c}$$ - parallel bond cohesion in units stress with default value 0.0.

pb_emod f

$$\overline{E}^{*}$$ - parallel bond effective modulus in units stress. This is a read-only property.

pb_fa f

$$\overline{\phi}$$ - parallel bond friction angle in units degrees with default value 0.0.

pb_force v

$$\overline{\mathbf{F}}$$ - parallel-bond force in units force with default value $$\mathbf{0}$$. Expressed in the contact plane coordinate system.

pb_kn f

$$\overline{k}_n$$ - parallel bond normal stiffness in units stress/disp. with default value 0.0.

pb_kratio f

$$\overline{\kappa }^{*}$$ - parallel bond normal-to-shear stiffness ratio. This is a read-only property.

pb_ks f

$$\overline{k}_s$$- parallel bond shear stiffness in units stress/disp. with default value 0.0.

pb_mcf f

$$\overline{\beta}$$ - parallel bond moment-contribution factor with default value 1.0.

pb_moment v

$$\overline{\mathbf{M}}$$ - parallel bond moment with default value $$\mathbf{0}$$. Expressed in the contact plane coordinate system.

$$\overline{R}$$ - parallel bond radius in units length. This is a read-only property.

pb_rmul f

$$\overline{\lambda}$$ - parallel bond radius multiplier with default value 1.0.

pb_shear f

$$\overline{\tau }_{c}$$ - parallel bond shear strength in units stress. This is a read-only property.

pb_sigma f

$$\overline{\sigma }$$ - parallel bond normal stress at bond periphery in units stress. This is a read-only property.

pb_state i

$$\overline{B}$$ - parallel bond state. This is a read-only property.

pb_tau f

$$\overline{\tau }$$ - parallel bond shear stress at bond periphery in units stress. This is a read-only property.

pb_ten f

$$\overline{\sigma}_c$$ - parallel bond tensile strength in units stress with default value 0.0.

rgap f

$$g_r$$ - reference gap in units length with default value 0.0.

user_area f

$$A$$ - set contact area to the constant value f.