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EXPERIMENTAL TESTING OF FIBER BASED STRUCTURES FOR PROTECTION OF STEEL SHEETS FROM EXPLOSION WAVE
Abstract
In order to protect the structural steel sheet from the impact of the blast wave, the steel sheet was covered with a composite material consisting of aramid fabrics with a surface density of 200 g/m2 (3 layers) and 350 g/m2 (3 layers). The total thickness of these layers was 2.4 mm. Turkish produced BRE 450 polyester resin was used to connect the layers. The composite was coated on top with the same resin filled with crumb rubber 1.5 mm in size. The thickness of this coating is 2.2 mm. The protective agent thus obtained was applied on one side of the steel sheet. The size of the protected sheets is 60 x 60 cm. The protective composite is applied to the steel sheet by the contact method, since the polyester binders are cured in the cold. Explosion resistance tests were carried out in an underground explosion chamber, where a special stand was located, which was a pipe with a diameter of 500 mm and a height of 1000 mm, equipped with the necessary sensors for pressure, sheet movement, and acceleration. The explosive charge was placed above the protected sheet at a distance of 400 mm. Mass of explosive (RDX) was 40 g. To record the wave formed an oscilloscope (DPO 2024 B) and sensors of type 113B23 (SN21594) with a sensitivity of 74.25 mV/mPa were used. The article presents the results of several variants of the explosion: oscillograms, which can be used to evaluate the movement (deflection) of the steel sheet, the acceleration of the deflection, the degree of suppression of the negative processes that occur during the explosion.
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