Low elastic modulus
The modulus of elasticity of FRP is two times larger than that of wood, but it is 10 times smaller than that of steel (E=2.1 * 106), so it is often difficult to deform in the product structure.
It can be made of thin shell structure and sandwich structure, and can also be made up of high modulus fiber or reinforced rib.
Long term temperature tolerance
General FRP can not be used for a long time at high temperature, the general polyester FRP at 50 degrees above, the intensity decreased significantly, generally only under 100 degrees Celsius use; general type epoxy FRP at 60 degrees above, the intensity has decreased significantly. But it is possible to choose the high temperature resistant resin to make the long working temperature at 200~300 centigrade possible.
Aging phenomenon
Aging is a common defect of plastics, FRP is no exception, in the ultraviolet, sand, rain and snow, chemical media, mechanical stress, etc., easily lead to performance degradation.
The interlaminar shear strength is low
The interlaminar shear strength is borne by the resin, so it is very low. The adhesive force between layers can be improved by choosing the process and using coupling agent. The most important thing is to avoid shearing the interlayer when the product is designed.