JKR Model Properties

The properties of the Johnson-Kendall-Roberts (JKR) Contact Model model are shown below for reference. See the properties table in the JKR Model “Properties” section for full details for each property.

Note

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

jkr

a0 f (r)

\(a_0\) - Equilibrium contact patch radius.

adh_exp f

\(M_a\) - active mode with default value 0.

dp_force v (r)

\(\mathbf{F^{d}}\) - dashpot force. Expressed in the contact plane coordinate system.

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.

fric f

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

jkr_force v

\(\mathbf{F^{JKR}}\) - JKR force with default value \(\mathbf{0}\). Expressed in the contact plane coordinate system.

jkr_poiss f

\(\nu\) - poisson’s ratio with default value 0.0.

jkr_shear f

\(G\) - shear modulus in units of stress with default value 0.0.

jkr_slip b (r)

\(s\) - sliding slip state.

pull_off_f f (r)

\(F_{po}\) - pull-off force.

ks_fac f

\(k_{sf}\) - shear stiffness scaling factor with default value 1.0.

tear_off_d f (r)

\(\delta_{po}\) - tear-off distance.

rr_fric f

\(\mu_r\) - rolling friction coefficient with default value 0.0.

rr_moment v

\(\mathbf{M^r}\) - Rolling resistance moment with default value \(\mathbf{0}\). Expressed in the contact plane coordinate system.

rr_slip b (r)

\(s_r\) - rolling slip state.

surf_adh f

\(\gamma\) - surface adhesion energy with default value 0.0.