A spring (linear or not, with or without failure criterion) is defined is the same way as volume materials:

materialno = materialset.define (number, type)
materialno = materialset(number)
materialno.put(param, value)
materialno.depend(param, fct, Key(Lock)))
...

Linear spring

Nonlinear spring.

Remarks :

• SPRING_FK et SPRING_FC are forces and not stiffness/damping coefficient (unlike ConstantSpringMaterial)
• the dependency is written as :

materialset(no).depend(SPRING_FK,fct1,Field1D(TX,RE))
materialset(no).depend(SPRING_FC,fct2,Field1D(TX,GV))

Nonlinear spring with failure criterion.

Once the material is defined, it must be associated to an ElementProperties:

prp = ElementProperties(typeEl)
prp.put(param1, value1)
prp.depend(param1, fct1, Lock1)) #facultatif
...

where

Nonlinear spring element. Associates two nodes with a stiffness. No axisymmetric correction is implemented. They must be associated with a FieldApplicator interaction.

Finally, once the Spring[2|3]DElement ElementProperties is defined, the corresponding interaction is generated with the FieldApplicator. To do so, the corresponding geometric mesh element must be generated using 1D Meshers (Curves). Once done, the interaction can be defined and included in the interactionset:

app = FieldApplicator(no)
app.push(gObject1)
app.push(gObject2)
...
app.addProperty(prp)        # association of an ElementProperties
interactionset.add(app)     # the interaction is added in InteractionSet 

or

app = interactionset.add(FieldApplicator(no)) #add returns a reference
app.push(gObject1)
app.push(gObject2)
...
app.addProperty(prp)        # association of an ElementProperties

where