COMPOSITES SCIENCE AND ENGINEERING ›› 2024, Vol. 0 ›› Issue (9): 52-56.DOI: 10.19936/j.cnki.2096-8000.20240928.008

• APPLICATION RESEARCH • Previous Articles     Next Articles

A method for optical fiber impact localization and load history reconstruction of composite laminates

FENG Zhenhui1, WANG Zhe2, ZENG Jie2*, CHEN Binbin2, FENG Chunle2, ZHOU Fan3   

  1. 1. Institute of Aerospace Physical and Chemical Analysis and Non Destructive Testing, Nanjing Chenguang Group Co., Ltd., Nanjing 210006, China;
    2. College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
    3. Innovation & Research Institute, Hiwing Technology Academy of CASIC, Beijing 100074, China
  • Received:2024-01-29 Online:2024-09-28 Published:2024-10-18

Abstract: A method for identifying the impact response characteristics of composite laminates based on fiber Bragg grating sensors is proposed for typical aerospace composite laminates. Based on the discrete strain sensing information of fiber Bragg grating sensors, a composite laminate impact strain response inversion method based on the principle of distance reciprocal multiplication has been developed. Based on the sudden change characteristics of the impact response and combined with the extreme value comparison method, identify the position of the strain response peak corresponding to the impact load. On the basis of identifying the impact position, the Bayesian regularization method is proposed to reconstruct the impact load of composite laminates, effectively solving the ill posed problem caused by the ill posed pulse response matrix in conventional load history reconstruction. The experimental results show that the average error between the coordinates of the impact point and the identification point is about 13.00 mm. The average relative error within the effective action history of the reconstructed impact load is about 4.21%, and the relative error for identifying the peak load is 3.85%.

Key words: composite laminates, fiber bragg grating sensor, impact load position, load history reconstruction, the power of the reciprocal of distance, non negative bayesian regularization

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