Simultaneously obtaining the Young´s relaxation modulus and shear relaxation modulus of an epoxy molding compound by using DMA

In this work, a methodology is developed for obtaining the Young´s relaxation modulus and shear relaxation modulus simultaneously by using a single dynamic mechanical analysis (DMA) experiment. The bulk modulus is assumed as a constant and calculated by Poisson´s ratio. The modulating Young´s moduli and characteristic times that measured by DMA are corrected analytically by using the developed formulas. The shear relaxation modulus is then obtained from the corrected modulating Young´s moduli and the constant bulk modulus. As a demonstration of the methodology, it is applied to the DMA measurement of an epoxy molding compound (EMC).