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啁啾光栅对沿其纵向的非均匀应变分布十分敏感,这种特性会反映在啁啾光栅的反射光谱图中。提出了一种利用外贴啁啾光栅监测带双缺口碳纤维复合材料损伤的新技术。实验结果表明,复合材料结构静态拉伸应变为4500με与8500με时,啁啾光栅反射光谱变化明显,这与复合材料应力-应变关系曲线在应变8000με时产生突变完全吻合,同时光栅反射光谱光强突变点位置与光栅几何位置完全一致,可实现对复合材料缺口位置损伤的定位及扩展监测。
Chirped gratings are highly susceptible to non-uniform strain distribution along their length, a characteristic that is reflected in the reflection spectrum of chirped gratings. A new technique to monitor the damage of double-gap carbon fiber composites by using chirped grating is proposed. The experimental results show that the chirped grating exhibits obvious changes when the static tensile strain of the composite structure is 4500με and 8500με, which is in good agreement with the stress-strain curve of the composite material when the strain is 8000με. Meanwhile, the light intensity of the grating reflection spectrum is abruptly changed The position of the point is exactly the same as the geometric position of the grating, so as to realize the positioning and the extended monitoring of the damage position of the notch of the composite material.