Accordion collapse with rotating icon
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CFRP代表“碳纤维增强塑料”。碳纤维复合材料应用于网球拍、高尔夫球杆、人体修复术、现代飞机等领域。在这里我们将以商用飞机为例。波音和空客采用复合材料制造机翼、翼梁、撑杆和机尾分段，认为它是比铝更好的材料。采用传统的铣削或刳刨工艺切割复合材料时，可能会导致分层、微裂纹、晶须和纤维拔出。用水刀切割时不会有此类问题。
如今的轻型先进复合材料在硬度和刚度方面与钢材相当，又可以如橡胶那般柔韧，同时还能承受超音速飞行时的应力。导致这些材料如此强悍的性质也造成其极难切割。复合材料技术不断创造出新的材料组合，挑战传统的机加工方法。
直到不久前，人们还在采用钻石/硬质合金轧机或刳刨机、带锯、圆锯、砂轮等传统切割方法来切割这些非传统材料。由于先进复合材料的组成和纤维方向，传统切割方法会加热复合材料或造成边缘剥离分层，导致材料损坏。另外，这些方法的速度一般较慢，经常产生分层和其他问题，需要耗费成本进行修复。
复合材料有多种形式。高温发动机采用以陶瓷纤维增强的金属（金属基复合材料）。通常工程师们的目标是减轻重量，同时提高强度，改善韧度或者增强耐温性。这些材料会让生产厂束手无策，但福禄水刀却能快速精确地切割它们，同时保持材料完好。