Research of Perforation of Structures Composing of Ice Block, Thin and Monolithic Steel Plates by a High-Speed Ogival Striker
摘要
The chapter presents the results of studies of the process of ice destruction under impact and explosive loads performed at Tomsk State University. The complexity of the study was ensured by natural, laboratory, and numerical experiments, the objects of study of which were natural and artificial ice, as well as ice sheets of 125 days of age. To describe the behavior of ice under impact, an elastic–plastic model and the concept of ice fracture based on a deterministic approach are used. The numerical Lagrangian method modified for simulating penetration and perforation problems was used as the main research tool. The perforation process has been simulated by the application of 2D finite elements analysis using IMPACT 2D.Axisymmetric problem. A procedure for determining the spall strength of ice is given on a series of five numerical experiments. In addition to direct comparison with experimental data, including those obtained by other authors, a sensitivity analysis of the grid was carried out. The research gap is defined as insufficient quantity of studies on the behavior of designs with ice and monolithic steel plates under impact with a high-speed striker. It were found by numerical modeling that in the current research objects, the time of perforation of the ice block by a high-speed striker and the accumulation of damage in it practically coincided. Calculations showed that the presence of a 6 and 7 mm-monolithic plate in the design led to partial and complete stuck of the striker in the lower layers, as well as low permanent deformation of the layers and erosion of the striker tip.