Abstract
The impact of ice on structures is a strong concern, in particular for aeronautical or space crafts that are strongly damaged by the impact of atmospheric ice, and more specifically by hailstones during hailstorms. During the impact, the hailstone is submitted to a complex loading including a strong dynamic tensile component that is responsible for its fragmentation and influences the mechanical loading transmitted to the impacted structure. However, up to now, very limited work were conducted on the tensile strength of ice under dynamic loading and the microstructure influence was out the scope of most studies. In particular the presence of porosity in ice as observed in hailstones is thought to significantly affect the ice mechanical response. The aim of this paper is to investigate the role of porosity on the tensile behavior of polycrystalline ice at high strain rates. To do so, spalling tests with a Hopkinson bar apparatus were conducted on microstructures characterized by porosities with two different pore size distributions. The dynamic tensile strength was computed by the use of the so-called Novikov formula and several indicators were used to assess the quality of each test. A whole set of high porosity samples was tested and additional tests were performed on low porosity ice, expanding the existing results in the literature. The fragmentation processes occuring during the spalling tests were observed by means of an ultra high speed camera and the influence of porosity on the main fracture planes was investigated by analysing post-spalling samples with an automatic ice texture analyser and X-ray tomography. Tensile strength is shown to increase with strain rate over the range \(24\,\hbox {s}^{-1}\) to \(120\,\hbox {s}^{-1}\) and to decrease with increasing porosity. The presence of large porosities in the high porosity samples appear to contribute preferentially to this strength decrease. Relevant observations concerning the detected cracks, the tortuosity of crack paths and the presence of porosities on the crack surfaces seem to validate the hypothesis of porosities playing a key role for crack initiation and propagation during ice fragmentation.
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Acknowledgements
The present work was developed in the framework of the Brittle’s Codex chair (Fondation UGA) and thanks to the support from the CEA-CESTA and from the Labex OSUG@2020 (ANR 10 LABEX 56). The provided support and fundings are gratefully acknowledged by the authors. The TomoCold facility was funded by CNRM, LabEx OSUG@2020 and the french national programme LEFE/INSU.
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Georges, D., Saletti, D., Montagnat, M. et al. Influence of Porosity on Ice Dynamic Tensile Behavior as Assessed by Spalling Tests. J. dynamic behavior mater. 7, 575–590 (2021). https://doi.org/10.1007/s40870-021-00300-z
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DOI: https://doi.org/10.1007/s40870-021-00300-z