弹性模量低
Low modulus of elasticity
FRP的弹性模量比木材大两倍，但比钢（E=2.1×105）小10倍，因此在产品结构中常感到刚性不足，容易变形。
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.
可以做成薄壳结构、夹层结构，也可通过高模量纤维或者做加强筋等形式来弥补。
It can be made into thin shell structure, sandwich structure, high modulus fibers or reinforcing ribs.
长期耐温性差
Long-term poor temperature resistance
一般FRP不能在高温下长期使用，通用聚酯FRP在50℃以上强度就明显下降，一般只在100℃以下使用；通用型环氧FRP在60℃以上，强度有明显下降。但可以选择耐高温树脂，使长期工作温度在200~300℃是可能的。
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.
老化现象
Aging phenomenon
老化现象是塑料的共同缺陷，FRP也不例外，在紫外线、风沙雨雪、化学介质、机械应力等作用下容易导致性能下降。
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.
剪切强度低
Low shear strength
层间剪切强度是靠树脂来承担的，所以很低。可以通过选择工艺、使用偶联剂等方法来提高层间粘结力，最主要的是在产品设计时，尽量避免使层间受剪。
Interlaminar shear strength is borne by resin, so it is very low. The bond strength between layers can qingxiji.89ix.comdipingy.89ix.commojuhpz.37ix.com.cnmojusn.37ix.com.cn zhagun.37ix.com.cnwantoun.37ix.com.cnbe improved by selecting process and using coupling agent. The most important thing is to avoid shearing between layers in product design.