Soft Bond Model Properties

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

Note

Some properties are read only as stated below.

softbond

dp_force v

$\mathbf{F^d}$ - dashpot force [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 [force/area]. This is a read-only property.

fric f

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

kn f

$k_n$ - normal stiffness [stress/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 [stress/length] with default value 0.0.

rgap f

$g_r$ - reference gap [length] with default value 0.0.

sb_area f

$A$ - cross-sectional area. This is a read-only property.

sb_bmul f

$\lambda_b$ - bending-friction multiplier with default value of 1.0.

sb_coh f

$c$ - cohesion [stress] with default value 0.0.

sb_cut f

$\gamma$ - tensile strength reduction factor.

sb_fa f

$\phi$ - friction angle [degrees] with default value 0.0.

sb_force v

$\mathbf{F}$ - force [force] with default value $\mathbf{0}$. Expressed in the contact plane coordinate system.

sb_mcf f

$\beta$ - moment-contribution factor. This is a read-only property.

sb_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. When the bond is activated, $M_l$ is automatically set to 1.

sb_moment v

$\mathbf{M}$ - moment. Expressed in the contact plane coordinate system.

sb_radius

$\overline{R}$ - radius. This is a read-only property.

sb_rmul f

$\lambda$ - Radius multiplier with default value 1.0.

sb_shear f

$\tau_{c}$ - shear strength [stress]. This is a read-only property.

sb_sigma f

$\sigma$ - maximum normal stress at bond periphery. This is a read-only property.

sb_slip b

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

sb_slipb b

$sb$ - bend slip state. This is a read only property.

sb_slipt b

$sb$ - twist slip state. This is a read only property.

sb_soft f

$\zeta$ - tensile-softening factor.

sb_state i

$B$ - bond state. This is a read-only property.

sb_tau f

$\tau$ - maximum shear stress at bond periphery. This is a read-only property.

sb_ten f

$\sigma_c$ - tensile strength [stress] with default value 0.0.

sb_tmul f

$\lambda_t$ - twisting-friction multiplier with default value of 1.0.

user_area f

$A$ - cross-sectional area (constant)