Y. Suna, H.-S. Leea, and Bongtae Hana
a CALCE, Center for Advanced Life Cycle Engineering, Department of Mechanical Engineering, University of Maryland, College Park, Maryland 20740, USA
Abstract:
We propose a novel experimental method, based on
a fiber Bragg grating (FBG) sensor, to measure the elastic
properties of epoxy molding compound (EMC) from a single
specimen configuration. The FBG sensor is embedded in the
center of a cylindrical EMC specimen, and deforms together
with the EMC. The Bragg wavelength (BW) shifts are documented
during compressive and hydrostatic loadings. Young’s
modulus and bulk modulus are determined from the BW shifts
using the relationships between the elastic constants and the
BW shift. Two major developments to accommodate the unique
requirements of EMC testing include: (1) a large mechanical
pressure to be applied during curing; and (2) a very high gas
pressure required for hydrostatic testing. The shear modulus
and Poisson’s ratio are calculated from the two measured constants
to provide a complete set of elastic properties of EMC.
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