Meaning
Mathematical formulation representing the stress-strain behavior of materials that undergo large, reversible deformations is used to simulate elastomer and soft polymer behavior. In thermoforming and blow moulding simulations, hyperelastic constitutive modeling predicts the thinning and stress distribution of the heated sheet as it conforms to the mold.
Simulation Accuracy
Finite element analysis of polymer processes depends on accurate material models to yield realistic results. By implementing hyperelastic constitutive modeling, design engineers can anticipate areas of extreme thinning before any metal tooling is cut. This reduces the number of prototyping cycles and shortens the time to market for new plastic packaging.
Model Calibration
Determining the coefficients of these mathematical formulations requires data from multiple deformation modes. Uniaxial tensile tests are insufficient, so hyperelastic constitutive modeling requires biaxial and planar shear test data for accurate calibration. Properly calibrated models prevent incorrect predictions of part stiffness and rupture during the thermoforming process.
This predictive accuracy is especially important when utilizing thinner gauges or recycled blends, where the processing window is narrower and the margin for error is reduced.
Wall Distribution
Consistent part performance relies on a uniform wall thickness across the entire formed geometry. Using hyperelastic constitutive modeling helps developers optimize the initial sheet thickness and temperature profile. This minimizes resin usage while ensuring the final part meets minimum thickness requirements for structural load-bearing capacity.
