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

\(\chi\) - adhesive branch exponent with default value 1.5.

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.

eepa_force v

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

eepa_poiss f

\(\nu\) - 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

\(f_{min}\) - minimum force with default value 1.5.

fric f

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

ks_fac f

\(k_{sf}\) - 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)

\(\delta_{max}\) - maximum overlap.

plas_ratio f (r)

\(\lambda_p\) - plasticity ratio with default value 0.5.

pull_off f (r)

\(F^0\) - pull-off force.

rgap f

\(g_r\) - reference gap in units length with default value 0.0.

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

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