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.
- 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.
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