Estimation of fatigue damage in holed composite laminates using an embedded FBG sensor
Estimation of fatigue damage in holed composite laminates using an embedded FBG sensor
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DOI：
10.1016/j.compositesa.2011.08.021
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发表时间：
2011-12
影响因子：
8.7
通讯作者：
S. Yashiro;T. Okabe
中科院分区：
文献类型：
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作者：
S. Yashiro;T. Okabe
研究了在循环荷载作用下，利用埋入式光纤光栅（FBG）传感器对开孔CFRP层合板进行损伤识别的问题。随着循环次数的增加，层裂和分层在孔附近扩展，并且来自FBG传感器的反射光谱被扭曲。此外，观察到的FBG传感器的剥离生长。然后，本研究估计层合板的损伤模式，从反射光谱和传感器脱粘损伤识别的影响进行了研究。剥离长度估计与给定的剥离长度模拟的频谱，并成功地确定只有当一个适当的损伤模式被假定。此外，更大的脱粘诱导无效的损伤模式的估计，即使脱粘长度的估计。损伤识别的模拟和实验需要一半的完整的计量部分。这些估计表明，由于脱粘，损伤模式的信息从频谱形状中消失。
This study investigated damage identification in holed CFRP laminates under cyclic loading by using an embedded Fiber Bragg Grating (FBG) sensor. Ply cracks and delamination extended near the hole with an increasing number of cycles, and the reflection spectrum from the FBG sensor was distorted. Moreover, debonding growth of the FBG sensor was observed. This study then estimated laminate damage pattern from reflection spectra and investigated the influence of the sensor debonding on damage identification. The debonding length was estimated from the spectrum simulated with a given debonding length and was successfully identified only when an appropriate damage pattern was assumed. Moreover, greater debonding induced invalid damage-pattern estimates, even if the debonding length was given in the estimation. The damage identification for simulations and for experiments required half of the intact gage section. These estimates indicated that information on the damage pattern disappeared from the spectrum shape because of debonding.