Meaning
Geometric deviation occurs when a cured composite part releases from rigid tooling and relieves locked-in residual manufacturing stresses. Measuring springback distortion defines the angular and dimensional changes caused by anisotropic thermal expansion and cure shrinkage differences through the laminate thickness. The metric governs tool surface compensation algorithms and part acceptance boundaries, stopping once mechanical release and thermal equilibrium are fully established.
Residual Stress
Asymmetric ply stacking and thermal gradients across tool surfaces generate balanced internal stress fields during cure. Unclamping the component allows springback distortion to alter part curvature as internal stresses seek mechanical equilibrium. Single-part prototype moldings indicate general distortion tendencies under ideal laboratory conditions.
Industrial autoclave runs show higher variability due to thermal mass differences across large production tools. Strain gauge arrays and optical photogrammetry capture post-demold shape shifts to refine tool geometry compensations.
Tooling Audit
Metrology sweeps compare post-cure part shapes against CAD models across production batches. Quantifying springback distortion during tool tryouts establishes true dimensional yields before full-rate production signoff.
Rejection Risk
Failing to compensate tool geometry for post-demold movement results in rejected parts and assembly mismatch during joining. Unpredicted shape changes require costly tool re-machining and schedule delays. Accurate springback distortion measurement ensures that final components meet strict spatial tolerances.
