Abstract
In this paper, thermal-wave radar imaging (TWRI) is used as a nondestructive inspection method to evaluate carbon-fiber-reinforced-polymer (CFRP) composite. An inverse methodology that combines TWRI with numerical optimization technique is proposed to determine the fiber layer-up lamination sequences of anisotropic CFRP composite. A 7-layer CFRP laminate \([0{^{\circ }}/45{^{\circ }}/90{^{\circ }}/0{^{\circ }}]_{\mathrm{{s}}}\) is heated by a chirp-modulated Gaussian laser beam, and then finite element method (FEM) is employed to calculate the temperature field of CFRP laminates. The phase based on lock-in correlation between reference chirp signal and the thermal-wave signal is performed to obtain the phase image of TWRI, and the least square method is applied to reconstruct the cost function that minimizes the square of the difference between the phase of TWRI inspection and numerical calculation. A hybrid algorithm that combines the simulation annealing with Nelder–Mead simplex research method is employed to solve the reconstructed cost function and find the global optimal solution of the layer-up sequences of CFRP composite. The result shows the feasibility of estimating the fiber layer-up lamination sequences of CFRP composite with optimal discrete and constraint conditions.
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Acknowledgments
This work was supported in part by the Chinese National Natural Science Foundation under Grant No. 51173034, Self-planned Task of State Key Laboratory of Robotics and System (HIT) and the Program of Introducing Talents of Discipline of Universities (Grant No. B07108), and the authors are grateful to Spaceflight Materials and Technology Research Institute (SMTRI) for the specimen manufactured.
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This article is part of the selected papers presented at the 18th International Conference on Photoacoustic and Photothermal Phenomena.
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Wang, F., Liu, J., Liu, Y. et al. Detection of Fiber Layer-Up Lamination Order of CFRP Composite Using Thermal-Wave Radar Imaging. Int J Thermophys 37, 97 (2016). https://doi.org/10.1007/s10765-016-2102-9
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DOI: https://doi.org/10.1007/s10765-016-2102-9