Simulation and Measurement of Shock Transmission Across Joints
Dr. Brendan O'Toole, University of Nevada Las Vegas
Dr. Samaan Ladkany, University of Nevada Las Vegas
Mr. Masoud Feghhi, University of Nevada Las Vegas
Mr. Karthik Doppola, University of Nevada Las Vegas

Abstract:
The purpose of the research is to understand, overcome or otherwise mitigate barriers to a physics-based finite element model that depicts the onset, dissipation, and propagation of high frequency shock waves from the point of weapon engagement to arbitrary zones of the vehicle where personnel, components, and/or structure are present. One critical barrier is the development of an accurate and efficient modeling procedure for the shock transmission across structural joints. This paper is focused on the methodology for simulating the propagation of shock through a structural joint. Baseline experimental data and computational results were generated for flat plates and steel hat sections subject to an impact load. An instrumented hammer was used to apply the load and the shock propagation is determined by monitoring accelerations at several locations on the structure. Dynamic Lagrangian computational analysis with LS-DYNA has been used to successfully simulate these baseline experiments. More complex structures that included several bolted or adhesive joint configurations were tested and simulated. Transient acceleration data was recorded and compared with simulations. Shock response spectrum analysis was performed on both the experimental data and simulated results. It was possible to simulate most of the experimental data accurately. Simulation of larger structures was more difficult. The effect of modeling parameters such as element type, number of elements, contact definitions, material properties, and friction coefficients are discussed.

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