ExoWind™

Superior mechanical properties, recyclable composite material exhibiting the optimal characteristics of both glass fibre and carbon fibre.

By 2050, global annual wind turbine blade waste will reach 2.9 million tons, with 43 million tons of cumulative wind turbine blade waste. China, Europe, United States and the rest of the world will have 40%, 25%, 16% and 19% waste respectively. Wind turbine blades can last up to twenty years, but many are taken down after just ten years, so they can be replaced with bigger and more powerful designs. Tens of thousands of aging blades are coming down from steel towers around the world and most have nowhere to go but landfill.

Being considerably stronger than glass fibre, ExoWind™ provides a ‘fit for purpose’ and viable solution in response to this global ecological crisis by providing an accelerated green transition to a circular economy for the wind energy industry.

With the tip of a larger wind turbine blade reaching speeds in excess of 400km/h (250mph), carbon fibre is frequently used to deal with centrifugal forces due to its exceptional longitudinal tensile strength over glass fibre. That said, its vulnerable to breaking on impact (i.e. hail, wind gusts etc).

ExoWind™ has superior longitudinal tensile strength over carbon fibre (CF: 900MPa / DANU™: 1020MPa).

ExoWind™ can replace both glass fibre and carbon fibre elements. It will provide increased safety strength on mechanical requirements and will fully resolve the current issues related to ‘end-of-life’ management.

Certification

In April 2021, ExoTechnologies commissioned an independent market-leading specialist material science and engineering laboratory to evaluate ExoWind™.

Specifications

ExoWind™ has been tested against the following internationally recognised standards:

  • BS EN ISO 62 : 2008BS
  • EN ISO 527-5 : 2009
  • BS EN 2850 : 2017
  • BS EN ISO 14125 : 1998 + A1 : 2011
  • BS EN ISO 14127 : 2008
  • BS EN ISO 14130 : 1998
  • ASTM D5379-19

Test specimens were cut and end tabbed, as required, from the supplied laminates. Samples were end tabbed using a printed circuit board glass fibre material, bonded with a paste adhesive. Test samples were allowed to condition in the laboratory at 23 °C ±1 °C and 50 % RH ±5 % RH, for a minimum of 16 hours prior to testing.

Samples taken from random locations on three of the supplied laminates were sectioned and then cold mounted. These samples were then ground and polished to a 1 micron finish prior to microscopy images being taken for qualitative void content determination. The void content was determined using Image J image analysis software to an in-house procedure. Microscopy images are shown in the appendix.

‘Wet’ properties were determined on laminate specimens which had been immersed in distilled water for 28 days at 35 °C ± 2 °C, dried and then tested immediately.

Summary Results

Quasi-Isotropic (Dry Result)

Tensile Strength

Max Force: 

35.3kN (0°) and 5.33kN (90°)

Max Stress: 

1020MPa (0°) and 93.5MPa (90°)

Compressive Strength

Max Compressive Strength:

19.5kN (0°)

Max Compressive Stress:  

 688MPa (0°)

Flexural Strength

Max Force: 

560N (0°) and 104N (90°)

Max Flexural Stress:

975MPa (0°) and 183MPa (90°)

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