Quantifying Time Dependent Viscoelastic Deformation during Coordinate Metrology Audits
Unmanaged viscoelastic creep under metrology clamping fixtures consumes up to forty percent of engineering tolerances, requiring documented dwell periods.
Elastic Recovery
Meaning
Reversible change in the dimensions of a material upon the removal of an applied deforming force defines a primary physical characteristic of polymers and metals. After the load is released, elastic recovery allows the test specimen to return toward its original pre-stressed shape. This phenomenon is critical in metal forming and polymer extrusion since the finished part deviates from the die dimensions.
Deformation Behavior
Viscoelastic materials exhibit a time-dependent return to their initial state, whereas purely elastic solids respond instantaneously. The extent of elastic recovery determines the springback in sheet metal stamping. Precision tooling must account for this behavior to maintain geometric tolerances.
Measurement Technique
Standardized testing instruments use indentation or tension to measure the dimensional change after load removal. In micro-indentation tests, the ratio of contact depth to residual depth provides a direct measure of elastic recovery. This evaluation helps manufacturers select appropriate materials for seals and gaskets.
Industrial Application
Sealing performance in high-pressure hydraulic circuits relies on the continuous force generated by the compressed material as it seeks to restore its volume. High elastic recovery prevents leaks by maintaining a tight fit against metal surfaces. It remains a primary specification for choosing elastomeric compounds.