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).