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Anisotropy in carbon fiber reinforced polymer (CFRP) and its effect on induction thermography

: Guo, Jianguang; Gao, Xiaorong; Toma, Ewald; Netzelmann, Udo


NDT & E International 91 (2017), pp.1-8
ISSN: 0963-8695
Journal Article
Fraunhofer IZFP ()
induction thermography; CFRP; anisotropy; fiber damage; simulation

Lock-in induction thermography was carried out on uniaxial, biaxial, and multi-ply woven carbon fiber reinforced polymers (CFRPs) at an induction frequency of approximately 300 kHz and at modulation frequencies of0.4–36 Hz to detect defects in them. The measurements were performed in reflection and transmission modes. In the uniaxial material, heating occurred far away from the excitation coil. Lines of minimal heating were observed. The modulation frequency dependence of the amplitude showed an inverse proportionality, indicating volume heating. The multiply woven CFRP plates with impacts of 3 and 5 J showed distinct contrast because of cracked fibers. The results were compared with those obtained using optically excited thermography and X-ray tomography.