IMPACT LOCALIZATION OF GLASS FIBER REINFORCED POLYETHYLENE THERMOPLASTIC COMPOSITE

Abstract

Abstract: As far as the application of glass fiber reinforced polyethylene thermoplastic composite (CGF/PE) is concerned, an online impact localization method was presented here based on optic fiber sensing and correlation coefficient method. First, the total experimental impact area of the glass fiber reinforced polyethylene thermoplastic composite laminate was divided into nine parts with equal areas. The impact response signals were collected by fiber Bragg grating (FBG) and de-noised by wavelet threshold method. Then, the time domain characteristic signals were collected at the maximum variances of the central wavelengths and the correlation coefficients of the time domain signals were calculated for impact localization. The result shows that 100% prediction accuracy is achieved for the composite laminate with initial divisions by online impact localization method proposed. Thereafter,the experimental area was subdivided in order to examine the prediction precision of the method. And the results show that the accuracy of 100% is achieved for 70 mm and 23.3 mm scales and 87.5% for 11.6 mm. Finally, the accuracy of the impact point location under three kinds of energies is explored. The results show that the accuracy rate on the 70 mm and 23.3 mm scales is 100%, and the scale on the 11.6 mm scale is 87.5%. High prediction accuracy with good precision is achieved by this method and its application in industry is truly promising.

Key words: thermoplastic composites, optical fiber sensing, time domain characteristic signal, impact localization, correlation coefficient method

CLC Number:

TB332

WANG Han, NI Ai-qing, WANG Ji-hui, CHEN Hong-da. IMPACT LOCALIZATION OF GLASS FIBER REINFORCED POLYETHYLENE THERMOPLASTIC COMPOSITE[J]. Composites Science and Engineering, 2020, 0(7): 85-92.

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