FANS OF COMPOSITE MATERIAL
The use of composite material in the manufacturing of fan blades for cooling systems and for underground ventilation is a great technical differential that
provides increased robustness, durability, and efficiency to this equipment.
What is composite material?
Definition: a composite material is a combination of 2 or more materials, which together have properties superior to those of their components individually.
It is divided into 3 parts:
Reinforcement - responsible for rigidity and resistance;
Matrix - holds the reinforcement fibers in place and transmits the loads between them;
Interface - the boundary surface of contact between components.
The reinforcements commonly used by FanTR are fiberglass, aramid or carbon. The matrix is a thermoset vinyl ester resin. The quality of the interface between these two substrates is essential to guarantee the calculated structural results and resistance.
Therefore it is necessary to understand the manufacturing process used by FanTR.
The composite material blades are manufactured through a process known as vacuum infusion, which makes it possible to position the layers of fabric, with different types of fibers and thicknesses, at different angles. In this way, the structural construction of FanTR blades, as it is done in the aeronautical sector, is optimized so the greatest resistance is in the most stressed directions and regions.
In summary, we can say that the composite material achieves excellent mechanical properties at the lowest possible weight. As an example, we can mention higher tensile strength and higher modulus of elasticity when compared to aluminum.
A very important aspect is that the composite material can be molded without geometry restrictions, which makes it possible to manufacture aerodynamic profiles with large blade widths and high torsions, ensuring excellent performance and
efficiency of the fans.
Additionally, for applications in environments subject to corrosion, the chemical barrier concept is used, where the vinyl ester matrix, combined with the gel coat, gives the material a much higher resistance than aluminum and stainless steel. This way the fans can be used in applications with high levels of chlorides and/or fluorides, among other highly corrosive components.
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