Akademik Veri Yönetim Sistemi
16th INTERNATIONAL CONGRESS ON ENGINEERING, ARCHITECTURE AND DESIGN , İstanbul, Türkiye, 20 - 22 Aralık 2025, ss.1-12, (Tam Metin Bildiri)
To mitigate the global impact of climate change,
efforts to identify cleaner and more efficient renewable energy alternatives
for energy production are rapidly progressing. The emergence of new
technologies such as new oil and gas reserves and shale gas is increasing the
use of fossil fuels, while simultaneously increasing their harmful
consequences. Therefore, it is necessary to develop environmentally friendly
and sustainable resources that can replace renewable energy sources. In this
regard, wind energy is one of the fastest-growing forms of electricity
generation, with an annual production of over one million gigawatt-hours.
According to an IRENA report, wind energy is expected to account for more than
30% of global electricity production by 2050. Today, wind turbine blades are
mostly manufactured from composite materials. Among these materials, carbon
fiber-reinforced polymer (CFRP) is the most preferred composite material. CFRP
has many mechanical properties, such as high strength-to-weight ratio,
stiffness, damping properties, and resistance to corrosion and abrasion. For
this study, 12 samples were cut from a CFRP composite plate. These cut
specimens were prepared using the adhesive bonding method on solvent-cleaned
surfaces. Bonding was performed using Loctite Hysol-9466, a two-component epoxy
adhesive that cures at room temperature and is mixed at a 2:1 ratio in an
applicator gun. Nine of the 12 bonded specimens were stored in separate
containers in 21°C seawater for one, two, or three months. The dry-surface
specimens and the specimens exposed to seawater were subjected to four-point
bending tests to examine the damage occurring on the adhesive bond surface.
Adhesion and cohesion separations occurred on all CFRP specimens. These
separations on the bond surface were caused by the maximum bending stress
occurring in the constant moment region where the loads were applied in the
four-point bending test. The damage was concentrated in the bending region
centered between the load application points, and the integrity of the specimen
body was largely preserved. This indicates that the fracture behavior initiated
in this region, where the highest bending stress was effective.