New 4D-printing method creates lighter, faster-spinning wind turbine blades

Researchers at Concordia University have developed a novel 4D printing technique for manufacturing wind turbine blades using carbon-fiber composites. This method aims to create lighter, more cost-effective, and easier-to-produce blades for small vertical-axis wind turbines.

PhD candidate Emad Fakhimi and Professor Suong Van Hoa from the Concordia Centre for Composites utilized flat carbon-fiber composite panels to form the curved blades. Vertical-axis wind turbines, often used in urban environments, typically require complex molds for blade production, which increases cost and weight.

The researchers introduced an innovative 'inverse' design procedure. Instead of starting with a specific carbon-fiber layup and observing the resulting shape, they began with the desired blade geometry and worked backward to determine the necessary arrangement and orientation of the carbon-fiber layers.

During the manufacturing process, flat carbon or epoxy laminates are cured and naturally deform into curved shapes as they cool. This deformation is due to engineered differences in material properties across the layers.

The resulting composite blades closely matched the shape of commercial aluminum blades but weighed approximately 80% less. Laboratory tests showed that turbines with these composite blades rotated faster than those with aluminum blades. This approach could lower manufacturing costs and broaden the use of lightweight composite structures in renewable energy systems and other engineering fields.

The research findings were published in the journal Polymer Composites.