9:15 - 9:50 am – “STAMP…what is it?”

David Corsi, Design & Simulation Engineering Manager, Beaumont

An accurate simulation is only as accurate as the information provided. One of the most important inputs in plastic flow simulation is the material file itself. If a material file is missing critical tested data, then the simulated results could be compromised. Simulation software generally uses a simplified thermo-viscous-elastic residual stress model due to the lack of good material data in anisotropic thermo-viscoelastic residual stress calculations and crystallization. This model has a constant solidification temperature with available material data obtained under laboratory conditions. It can generally provide acceptable results helping users optimize the processing conditions for mold and part design. However, model calibration and correction can further improve the predicted accuracy. Moldflow uses measured shrinkage data to improve the shrinkage and warpage prediction for Midplane and Dual Domain models known as CRIMS “Corrected Residual In-Mold Stress”. STAMP or “Shrinkage Test Adjusted Mechanical Properties” is a shrinkage correction model that will use the measured shrinkage data, obtained from rectangular plaque moldings, to calibrate modulus, Poisson’s Ratio, and Coefficient of Thermal Expansion (CTE). This new model gives additional accuracy for 3D simulations and is only available for Autodesk Moldflow.