Researchers at Concordia University have developed an innovative 4D composite printing process that produces lightweight, high-performance vertical-axis wind turbine blades while reducing manufacturing time and costs.
4D printed wind turbine blades could reshape wind turbine manufacturing
Reducing manufacturing costs and production times while delivering reliable, high-performance components is one of the biggest challenges facing the wind industry. With this objective, engineers Emad Fakhimi and Suong Van Hoa from Concordia University in Canada have developed an innovative manufacturing method to produce 4D printed wind turbine blades for vertical-axis wind turbines.
Their research demonstrates that composite blades can be manufactured with geometries comparable to commercial aluminium blades while being significantly lighter and faster to produce. The approach could open new opportunities for the future development of vertical-axis wind technology.
Unlike conventional horizontal-axis turbines, vertical-axis wind turbines rely on curved blades that are typically manufactured through specialised forming processes requiring complex moulds. These manufacturing steps increase both production costs and lead times, making 4D printing an attractive alternative.
How does 4D printing work?
One of the most promising frontiers in advanced manufacturing is 4D printing, a technology capable of producing components that change shape or structural properties over time.
However, the term encompasses two distinct manufacturing approaches. The first is conventional 4D printing, which uses smart polymers such as hydrogels or shape-memory materials capable of responding autonomously to environmental stimuli. These materials react to humidity, heat or pH changes by expanding, bending or otherwise altering their structure.
The manufacturing process developed at Concordia University instead relies on 4D Printing of Composites (4DPC), a substantially different technique that also requires moulds during production.
Rather than smart polymers, 4DPC uses continuous carbon fibre composites impregnated with epoxy resin or thermoplastic matrices. As the researchers explain, these continuous fibres account for approximately 50% to 60% of the composite volume, providing significantly higher stiffness, around 100 GPa, and strength, approximately 100 MPa.
If the material itself is rigid, how can it change shape?
In this process, the transformation is not triggered by external environmental conditions but by the orientation of the carbon fibres. Carbon fibre is anisotropic, meaning its mechanical properties vary depending on the direction in which the fibres are aligned.
Manufacturing 4D printed wind turbine blades
To produce the curved blades required for vertical-axis wind turbines, the engineers deposited continuous resin-impregnated carbon fibres onto a flat surface, arranging successive layers in different orientations. The resulting composite laminate was then heated to the resin curing temperature before being cooled.
Material physics performs the rest. Carbon fibre has an almost zero coefficient of thermal expansion, while the resin contracts as it cools. Because each layer has a different fibre orientation, the flat laminate naturally deforms into the desired curved shape.
The novelty of the research lies primarily in its design methodology. Instead of starting with a predefined fibre orientation and observing the resulting geometry, the researchers first defined the target blade shape and then worked backwards to determine the fibre layout required to achieve it.
“This procedure saves both time and manufacturing costs because moulds with complex curvatures are no longer required,” write Fakhimi and Van Hoa. “At the same time, the resulting material remains strong, stiff and lightweight, offering significant advantages in terms of weight reduction and handling.“
Results and future development
The 4D printed wind turbine blades closely matched the geometry of commercially available aluminium blades while weighing approximately 80% less. Laboratory testing also showed that the lighter blades rotated at higher speeds.
The researchers caution, however, that further work is required before commercial deployment. Future studies will need to address several critical aspects, including bending stiffness, long-term durability under environmental exposure, fatigue resistance and structural safety under centrifugal and aerodynamic loads.
Addressing these challenges will be essential to ensure that the technology can deliver safe, reliable and economically viable wind turbine operation.
The study by Emad Fakhimi and colleagues, Development of Vertical Wind Turbine Blades Using 4D Printing of Composites, was published in Polymer Composites (2026). DOI: 10.1002/pc.70998.
