Compare set, relaxation, creep and viscoelastic response
- Compression setThis term
After the load is released and the specified recovery period passes, remaining deformation is the set. It is not retained sealing force.
- Stress relaxation
At constant deformation, the measured force decreases over time. Compare tests with the same specimen and exposure conditions.
- Creep
With a sustained load, deformation can grow over time. The loading condition differs from a relaxation test.
- Viscoelasticity
The response combines elasticity and time dependence. Recovery rate and loading history matter for polymers and elastomers.
The controlled condition determines what is measured. Compression set is assessed after release; relaxation holds deformation; creep holds load; viscoelasticity includes time-dependent recovery.
Qualitative curves and sections without measured values or predictions. Test temperature, specimen, exposure and timing must be equivalent before comparing materials.