# Linear Parallel Bond Model Methods

The methods of the Linear Parallel Bond Model model are shown below for reference. More detailed information regarding these methods is presented here.

linearpbond
area

Set the user_area property, fixing the contact area, from the current piece configuration.

bond <keyword>

Bond the contact.

gap f1 <f2 >

Bond contacts with the gap interval specified. If only one value is specified this is the upper bound of the interval. If two values are specified they correspond to the lower and upper bounds of the interval, respectively. By default the interval is $$(-\infty,0]$$.

deformability keyword ...

Set the deformability.

emod f

Specify the effective Young’s modulus.

kratio f

Normal-to-shear stiffness ratio.

pb_deformability keyword ...

Set the parallel bond deformability.

emod f

Specify the effective Young’s modulus.

kratio f

Normal-to-shear stiffness ratio.

unbond <keyword>

Unbond the contact.

gap f1 <f2 >

Unbond contacts with the gap interval specified. If only one value is specified this is the upper bound of the interval. If two values are specified they correspond to the lower and upper bounds of the interval, respectively. By default the interval is $$(-\infty,0]$$.