Advantages and disadvantages of FRP

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Author Articoli
Author Articoli
6 marzo 2019 at 03:05 #131921

seventrust
Post count: 15016

Light weight and high strength
The relative density is between 1.5 and 2.0, only 1/4 to 1/5 of carbon steel, but the tensile strength is close to or even higher than that of carbon steel, and the specific strength can be compared with that of high alloy steel. Therefore, it has achieved remarkable results in aviation, rocket, spacecraft, high pressure vessel and other products which need to reduce self-weight. The tensile, bending and compressive strength of some epoxy FRP can reach more than 400 Mpa.[url=http://www.discountsteelcoils.com/steel-supply/1161.html]Products In Stock Cheap 316 Stainless Steel Decorative Sheets[/url]
Corrosion resistance
FRP is a good corrosion-resistant material. It has good resistance to atmospheric, water and general concentration of acids, alkalis, salts as well as a variety of oils and solvents. It has been applied to all aspects of chemical anticorrosion, and is replacing carbon steel, stainless steel, wood, non-ferrous metals and so on.
Good electrical properties
It is an excellent insulating material for making insulators. It can still protect good dielectric properties at high frequencies. Microwave transmission is good and has been widely used in radar radome.
Good thermal performance
FRP has low thermal conductivity, 1.25-1.67 kJ/(m.h.K) at room temperature and only 1/100-1/1000 of metal. It is an excellent insulation material. It is an ideal material for thermal protection and ablation resistance under instantaneous ultra-high temperature. It can protect spacecraft from high-speed airflow at temperatures above 2000 (?)
Good designability
(1) Various structural products can be designed flexibly according to the need to meet the use requirements, which can make the product have a good integrity.
(2) Material can be fully selected to meet the performance of the product, such as: can be designed corrosion-resistant, instantaneous high temperature resistance, the product has a special direction of high strength, good dielectric, and so on.
Excellent workmanship
(1) The forming process can be flexibly selected according to the shape, technical requirements, use and quantity of the product.
(2) The process is simple, can be formed at one time, and the economic effect is outstanding. Especially for the products with complex shape and less quantity which are not easy to form, the technological superiority of the product is highlighted.[url=http://www.discountsteelcoils.com/steel-supply/1000.html]300series 304 316 316L Stainless Steel Round Bar[/url]
shortcoming
Low modulus of elasticity
The modulus of elasticity of FRP is twice as large as that of wood, but 10 times smaller than that of steel (E=2.1*105). Therefore, the rigidity of FRP is often insufficient in product structure and it is easy to deform.
It can be made into thin shell structure, sandwich structure, high modulus fibers or reinforcing ribs.
Long-term poor temperature resistance
Generally, FRP can not be used for a long time at high temperature. The strength of general polyester FRP decreases obviously above 50 C, and generally only below 100 C. The strength of general epoxy FRP decreases obviously above 60 C. However, high temperature resistant resins can be chosen, so that long-term operating temperature is possible at 200 ~ 300 C.
Aging phenomenon
Aging is a common defect of plastics, and FRP is no exception. Under the action of ultraviolet radiation, wind, sand, rain, snow, chemical medium, mechanical stress, etc., it is easy to cause performance degradation.
Low shear strength
Interlaminar shear strength is borne by resin, so it is very low. The bond strength between layers can be improved by selecting process and using coupling agent. The most important thing is to avoid shearing between layers in product design.[url=http://www.asiasteelcoils.com/steel-coil/7746.html]316 Puntas De Presi��n De Tuber��a Inoxidables[/url]

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