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Metal-polyurea composites have gained significant interest as a potential composite in resisting blast and ballistic impact loads. Although the loading mechanisms are different for these two types of loading, they both fall under the category of high-strain-inducing loads. Resisting such loads require high energy absorption capabilities, which is the main advantage that has promoted the use of elastomers such as polyurea in these applications. This chapter presents the findings of experimental and numerical investigations involving metal-polyurea composites under a blast load equivalent to 1kg of trinitrotoluene at a standoff distance of 150mm and a ballistic load of a projectile fired at an approximate velocity of 930m/s. The blast tests revealed that the steel plates with polyurea coating at the back face yielded lower residual deflection as well as minimum damage to the polyurea coating than the plates with coatings at the front face. It was also identified that an optimum coating t ....
This paper studies the nonlinear dynamic response of arching masonry walls to blast load. The methodology combines laboratory blast testing and nonlinear dynamic modeling of arching one-way masonry walls and their response to blast load. The paper aims at enhancing the understanding of the dynamic and nonlinear physical response of the structural system. The experimental phase focuses on a one-way arching masonry wall tested in a blast simulator. The test is designed to explore global and local measures of the response of such walls. New experimental data that contributes to the understanding of the blast response and for validating theoretical and numerical models is presented. The theoretical phase develops a nonlinear, dynamic, continuous beam-type model that considers the deformability of the mortar joints and the masonry units. The model combines inertial effects with geometrical and material nonlinearities and uses the finite element method for the numerical solution. The model i ....
Bridge comprises 785 meters long steel arch spread over river; Bridge designed for blast load in consultation with DRDO; Construction of bridge taken after detailed survey; Bridge constructed to bear earthquakes; work on track laying going on, bridge to be operational soon: Officials Jammu Tawi, Dec 02: The Indian Railways has achieved a major feat by ....
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