Static Strength Reduction and Acoustic Emission Analysis of Fiberglass-Epoxy Samples Subjected to Various Levels of Moisture Absorption
Marine Hydro-Kinetic energy is a promising source of renewable energy early in technical development. Material characterization in marine environments is a crucial step to successful design and implementation of these devices. Epoxy-fiberglass material systems utilized in wind turbine blade manufacture are being studied for use in MHK environments as they offer favorable performance, cost and durability. Previous research of these materials has shown a significant drop in strength due to moisture absorption. The research presented in this paper extends these studies by exploring the effects of partial saturation (100, 500, 1000 hours, etc.) on static strength. Two layups were tested in which the primary load bearing plies were placed in different locations within the stacking sequence. Acoustic emission sensors and peak frequency analysis were utilized throughout all tests to investigate the effects of moisture absorption on individual damage mechanisms.
Authors: Jake D. Nunemaker, David A. Miller, Michael M. Voth, Paul Murdy, Douglas S. Cairns, and Daniel D. Samborsky
Conference: SAMPE Seattle 2017