Abstract
In order to study the damage characteristics of polymer plates under the impact of the underwater explosion, the underwater contact and near‐field explosion tests of polymer plates were conducted using different explosive quantities. In this paper, eight polymer plates with the size of 500 mm × 500 mm × 60 mm were made, and eight groups of explosion tests were carried out by using the rock emulsion explosive and nonconductive detonators. The damage modes and spatial distribution characteristics of the polymer plate generated by the underwater contact and near‐field explosion impact with different explosive quantities are compared and analyzed. In addition, the characteristics of the shock wave propagation in the plates are investigated. It can be observed that the main damage mode of polymer plate is overall damage under the contact underwater explosion. For the near‐field explosion, the main damage mode changes to overall failure, and the damage of contact explosion to polymer plate is greater than that of underwater near‐field explosion. The polymer plate can reduce and delay the shock wave effectively, but the effect decreases with the increase of explosive quantity in the underwater contact explosion.
Highlights
Polymer material, known as polyurethane, consists of polyol, isocyanate, and other raw materials
Due to the characteristics of lightweight, high expansion, strong permeability resistance, good durability, rapid curing, no pollution, etc., the polymer materials are widely used in foundation trenchless repair engineering and other infrastructures, such as trenchless repair of drainage pipeline leakage and settlement [1, 2], antiseepage reinforcement of dam [3], and improvement of foundation [4, 5]. erefore, it is of great engineering significance and theoretical value to study the damage characteristics of polymer plates under underwater explosions
Chen et al [8] conducted a tear resistance test on polymer materials under different temperature, humidity, and freezing conditions, and the results showed that the polymer material has good durability
Summary
Known as polyurethane, consists of polyol, isocyanate, and other raw materials. Yu et al [21] conducted a contact explosion test on BFRP reinforced concrete slab and found that the high strength and flexibility of BFRP make BRCS have better antiexplosion performance. Zhao et al [23] conducted experimental studies on the damage characteristics of concrete slabs under air and underwater contact conditions and obtained the influence of explosive quantity, steel bar, explosive shape, and fixed boundary on the damage of concrete slabs. Yang et al [25] compared the field explosion test results with the numerical model and studied the influence of different section shapes on the antiexplosion performance of reinforced concrete columns under underwater explosions. E above research mainly focuses on the antiexplosion performance of reinforced concrete materials, while less attention has been paid to the explosion characteristics of polymer materials, especially under the underwater explosion load. By comparing the failure mode and the time history curve of shock wave pressure of polymer plate under the condition of different explosive quantity and distance from blasting center, the damage characteristics of polymer plate under the impact of underwater explosion are investigated
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