Bringing nature into engineering with carbon flat profiles
Society often draws inspiration from nature. Leonardo da Vinci studied birds to design flying machines, while Velcro was inspired by burdock burrs clinging to a dog. This approach imitates nature’s designs, known as biomimicry, but also addresses key human challenges through innovative engineering. With the same intention, French deeptech startup EEL Energy sought to redefine how we harness energy from nature. But when delamination in its design threatened to halt progress, pultruded and pull-wound composites manufacturer Exel Composites was ready with a solution. EEL Energy specialises in hydrokinetic machines, developing a patented undulating membrane that draws inspiration from the movements of fish tails. This biomimetic design captures kinetic energy from water currents, providing a sustainable method for generating electricity that is non-disruptive to aquatic ecosystems. However, as EEL embarked on bringing hydrokinetic energy production to market, it faced significant challenges. The underwater environment is particularly demanding, necessitating materials that can withstand extreme stress and pressure. “Hydrokinetic generation exerts up to 30 times more mechanical stress on equipment than wind energy production,” explained Xavier Peroutka, CEO at EEL. “Hydrokinetic generators can produce energy constantly throughout their life by leveraging the water currents in rivers or tidal flow. The predictability of hydrokinetic energy generation is needed by communities across the globe in a green revolution that threatens to leave the neediest behind.” Collaboration to gain material expertise To address the challenge, EEL sought out Exel Composites. The collaboration aimed to enhance the resilience of EEL’s membrane and refine its performance for harsh underwater conditions. Initially, EEL reinforced its membrane with fiberglass, but this original design revealed a critical flaw: delamination. Under the harsh cyclic loading of the underwater conditions, the membrane underwent large deformations, inducing high strains in the structure. The strain caused the layers of the membrane to separate, allowing water […]