Modeling and experimental study of thermal equivalents of impact damage in composites during the development of reference samples in thermal control

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Abstract

The concept of “thermal equivalents” of impact damage in composites, created by iteratively fitting the parameters of flat bottom hole defects, has been elaborated. In thin-walled composites, impact damage tends to be located near the surface opposite to the impact, so thermal inspection on the rear surface of the product is most effective for their detection. Detection of defects on the front surface is associated with small signal amplitudes in the region of temperature indications and requires the use of the thermal equivalent of impact damage in the form of a combination of flat bottom hole defects. On the rear surface, temperature indications of impact damage are often butterfly-shaped and characterized by a large area of defect “footprints”. Single flat-bottom flaws can serve as thermal equivalents of such defects. The proposed concept of thermal equivalents of real defects in composites is verified experimentally on a carbon fiber-reinforced plastic specimen with impact damage of the 62 J energy.

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About the authors

V. P. Vavilov

Tomsk Polytechnic University

Author for correspondence.
Email: chulkovao@tpu.ru
Russian Federation, 634050 Tomsk, Lenin Av., 30

A. O. Chulkov

Tomsk Polytechnic University

Email: vavilov@tpu.ru
Russian Federation, 634050 Tomsk, Lenin Av., 30

O. A. Ganina

Tomsk Polytechnic University

Email: vsoa@tpu.ru
Russian Federation, 634050 Tomsk, Lenin Av., 30

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Supplementary files

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2. Heating impulse circuit

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3. Fig. 1. Change in the defect mark of impact damage with an energy of 62 J on the front surface of a 4.6 mm thick carbon fiber reinforced plastic after exposure to a short-term thermal pulse.

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4. Fig. 2. On the selection of a flat-bottomed thermal equivalent of the impact damage response in 4.6 mm thick carbon fiber reinforced plastic with a one-sided TC on the front surface (see Fig. 1): a - change in temperature contrast over the defect (experiment and theory); b - configuration of a flat-bottomed hole and an example of an IR thermogram of a flat-bottomed hole.

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5. Fig. 3. Change in the defect mark of impact damage with an energy of 62 J on the front surface of a 4.6 mm thick carbon fiber reinforced plastic after exposure to a short-term thermal pulse.

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6. Fig. 4. On the selection of a flat-bottomed thermal equivalent of the impact damage response in 4.6 mm thick carbon fiber reinforced plastic with a one-sided TC on the rear surface (see Fig. 3): a - change in temperature contrast over the defect (experiment and theory); b - configuration of a flat-bottomed hole and an example of an IR thermogram of a flat-bottomed hole.

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7. Fig. 5. Flat-bottomed hole as a thermal equivalent of the impact damage response in 4.6 mm thick carbon fiber reinforced plastic with one-sided TC of the rear surface (see Fig. 4): a — experimental sample with impact damage and flat-bottomed hole; b — change in temperature signal over time in the impact damage zone and thermal equivalent of its response.

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8. Results of TC impact damage in carbon fiber reinforced plastic

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