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)

a0 - Equilibrium contact patch radius.

adh_exp f

Ma - active mode with default value 0.

dp_force v (r)

Fd - dashpot force. Expressed in the contact plane coordinate system.

dp_mode i

Md - dashpot mode with default value 0.

dp_nratio f

βn- normal critical damping ratio with default value 0.0.

dp_sratio f

βs - shear critical damping ratio with default value 0.0.

fric f

μ - sliding friction coefficient with default value 0.0.

jkr_force v

FJKR - JKR force with default value 0. Expressed in the contact plane coordinate system.

jkr_poiss f

ν - 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)

Fpo - pull-off force.

ks_fac f

ksf - shear stiffness scaling factor with default value 1.0.

tear_off_d f (r)

δpo - tear-off distance.

rr_fric f

μr - rolling friction coefficient with default value 0.0.

rr_moment v

Mr - Rolling resistance moment with default value 0. Expressed in the contact plane coordinate system.

rr_slip b (r)

sr - rolling slip state.

surf_adh f

γ - surface adhesion energy with default value 0.0.