(1) a low modulus of elasticity
Frp materialmodulus of elasticity than the timber is twice as large, it is 10 times smaller than that of steel (E = 2.1 x 106), and therefore insufficient rigidity, often felt in the product structure is easily deformed.
Shell structure, the sandwich structure can be made, but also by the high-modulus fibers, or do stiffener form to compensate.
(2) long-term temperature resistance and poor
General Frp grating can not be long-term use at high temperatures, general purpose polyester FRP strength decreased significantly above 50 ℃, generally below 100 ° C; Universal epoxy FRP strength decreased significantly above 60 ℃. But you can choose a high temperature resin, long-term operating temperature 200 ~ 300 ℃ is possible.
(3) aging
The aging phenomenon is common defects of plastic, FRP is no exception, under the action of UV rays, Wind Yarn rain and snow, chemical media, mechanical stress easily lead to performance degradation.
(4) low interlaminar shear strength
Interlaminar shear strength is borne by the resin, so low. Through the selection process, the use of a coupling agent to improve the bond strength between layers, most notably in the design of the product, try to avoid to make interlayer shear
fiberglass grating 