4 . the choice reference of medium belt material is came up with : with higher compress intensity , pull intensity and bend fatigue intensity , with middle or low elastic modulus , besides fine heat - resistant , wearable , oil - fast , water - fast anti - impactive capabilities 4 、提出并分析了介质带材料的合理选择原则：压缩强度、拉伸强度和弯曲疲劳强度高和韧性好的中低弹性模量复合材料，此外还需具有良好的耐热、耐油耐水性、耐磨性、抗冲击性、耐候性等。
Fiber reinforced plastics have used widely in every walk of life , especially in aviation and spaceflight because they have more merits than common metal materials , such as light quality , high intensity and so on . they have replaced metal step by step and hold an advantaged position 纤维增强复合材料与一般的金属材料相比，具有质轻、高强度、耐腐蚀性、抗冲击性、整体成型容易等优点，在各行各业已经获得普遍的应用，特别是在航空航天工业中。复合材料结构正在逐步取代金属结构，占驻有利地位。
