Development of Dielectrostrictive Sensors for On-line Shear Stress Measurement During the Injection Molding Process

摘要

This study presents the development of a novel sensor based on dielectrostriction principles. Dielectrostriction, defined as a variation of dielectric properties of material under deformation, detects evolution of molecular orientation during injection molding and enables on-line shear stress measurement. To demonstrate the feasibility of this approach, a planar capacitor sensor rosette has been developed and attached to the surface of an injection mold to obtain the dielectrostriction signals under various processing conditions. The calculated shear stresses of polymer melts based on the dielectrostriction signals were validated by simulation predictions.