Departmental Bulletin Paper Bootstrap Method for Detecting Damage in Carbon Fiber Reinforced Plastic Using a Macro Fiber Composite Sensor

DJANSENA, Alradix  ,  田中, 宏明  ,  工藤, 亮

Vol.55 ( No.1 )  , pp.1 - 11 , 2015-09 , National Defense Academy
CFRP has been used in aircraft structures for decades. Although CFRP is light, its laminationis its main weakness. We have developed a new method to increase the probability of detectingdelamination in carbon fiber reinforced plastic (CFRP) by narrowing the confidence interval ofthe changes in natural frequency. The changes in the natural frequency in delaminated CFRPare tiny compared with measurement errors. We use the bootstrap method, a statisticaltechnique that increases the estimation accuracy from small samples, for detecting damage inCFRP. The natural frequency was measured using a macro fiber composite sensor toinvestigate the efficiency of the method. The results show that the confidence intervals of thenatural frequency are improved by using the bootstrap method.

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