Jake Nunemaker will present his Master's Thesis Defense on Friday, December 16, at 9:00 a.m.
- Friday, December 16, 2016 at 9:00am
- Roberts Hall - view map
Effects of Moisture Absorption on Static Strength and Acoustic Emission Signatures of Off-Axis Fiberglass-Epoxy Composites
Marine Hydro-Kinetic (MHK) devices encompass promising new technologies designed to harness energy from ocean currents and tides. However, there are unique challenges to successful implementation of MHK devices. Material selection and characterization are crucial steps in the design process as the marine environment can be extremely detrimental to many materials systems. Fiberglass-epoxy composites, the premier material in wind turbine blades are being studied for use in MHK due to desirable price and durability. Preliminary research has shown that a significant drop in ultimate strength due to moisture absorption in unidirectional laminates. This research extends these studies by exploring these effects on balanced and unbalanced off-axis fiber angles for a common epoxy-fiberglass material system. Ply by ply analysis is completed to explore the efficacy of a strength reduction prediction method for off-axis laminates. It also extends the study to include acoustic emission analysis to further investigate the material degradation at a micromechanical level. Partial saturation strength reduction in symmetric laminates is also studied.