EEPA Model Properties

The properties of the Edinburgh-Elasto-Plastic-Adhesive (EEPA) Contact Model model are shown below for reference. See the properties table in the EEPA “Properties” section for full details for each property.

Note

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

eepa
adh_exp f

χ - adhesive branch exponent with default value 1.5.

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.

eepa_force v

FEEPA - EEPA force with default value 0. Expressed in the contact plane coordinate system.

eepa_poiss f

ν - poisson’s ratio with default value 0.0.

eepa_shear f

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

eepa_slip b (r)

s - sliding slip state.

force_min f

fmin - minimum force with default value 1.5.

fric f

μ - sliding friction coefficient with default value 0.0.

ks_fac f

ksf - shear stiffness scaling factor with default value 1.0.

lu_exp f

m - loading-unloading branch exponent with default value 1.5.

overlap_max f (r)

δmax - maximum overlap.

plas_ratio f (r)

λp - plasticity ratio with default value 0.5.

pull_off f (r)
F0 - pull-off force.
rgap f

gr - reference gap in units length with default value 0.0.

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 - Effective surface adhesion energy with default value 0.0.