The aim of this work is to improve the understanding of the damage scenario of a composite plate subjected to ballistic impact. To do this, the authors rely on recent work that has demonstrated the relevance of using high-speed infrared thermography to assess the damage scenario during low-speed impact tests. The results obtained during ballistic impact tests with a steel ball 16 mm in diameter and for impact velocities ranging from 40 m.s \(^{-1}\) to 75 m.s \(^{-1}\) are presented. A specific experimental set-up was used, in which infrared images were obtained through a mirror. A metrological study using an extended black body was carried out to ensure that the temperature measurement was not affected by this specific configuration. A somewhat unusual UD ply stacking sequence was used ( \([0/+60/-60]_{ns}\) ) in order to approximate as closely as possible a test configuration available in the literature on a triaxially braided composite material with the same fibre orientations. The results of this study show that, despite the small number of images captured for these high-speed impact configurations, they nevertheless provide valuable information on the damage scenario during these tests.

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In-Situ Measurement of Damage Appearance and Growth During Ballistic Impact Tests on Composite Materials

  • Julien Berthe,
  • Gérald Portemont,
  • Thomas Fourest

摘要

The aim of this work is to improve the understanding of the damage scenario of a composite plate subjected to ballistic impact. To do this, the authors rely on recent work that has demonstrated the relevance of using high-speed infrared thermography to assess the damage scenario during low-speed impact tests. The results obtained during ballistic impact tests with a steel ball 16 mm in diameter and for impact velocities ranging from 40 m.s \(^{-1}\) to 75 m.s \(^{-1}\) are presented. A specific experimental set-up was used, in which infrared images were obtained through a mirror. A metrological study using an extended black body was carried out to ensure that the temperature measurement was not affected by this specific configuration. A somewhat unusual UD ply stacking sequence was used ( \([0/+60/-60]_{ns}\) ) in order to approximate as closely as possible a test configuration available in the literature on a triaxially braided composite material with the same fibre orientations. The results of this study show that, despite the small number of images captured for these high-speed impact configurations, they nevertheless provide valuable information on the damage scenario during these tests.