Modeling and Simulation of the Impact Response of Linear Cellular Alloys for Structural Energetic Material Applications

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Jakus, Adam
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We investigate the deformation and fracture as well as stress transfer behavior of 250 maraging steel linear cellular alloys (LCAs) undergoing high velocity impact upon a rigid target. Of paramount importance for application as a ballistic delivery mechanism for thermite powders, is the ability to transfer stress along the inner length of the cell walls. Additionally, outward fragmentation of the LCA body upon impact must be controlled. Parameters for a Johnson-Cook strength model of 250 maraging steel are determined in conjunction with 3-dimensional Lagrangian based finite element analysis on a solid cylinder. These parameters are then applied to four, 25% theoretical density LCA geometries: hollow cylinder, pie, reinforced pie, and 9-cell waffle. Verification of the validity of the Johnson-Cook parameters determined from the solid cylinder experiments and simulations is analyzed through comparison of experiments of the four LCA geometries, produced using a direct reduction technique with corresponding simulations. Upon verification of the Johnson-Cook strength model for maraging steel, the deformation and fracture as well as the stress transfer response of the LCAs during impact is analyzed. Through transient analysis of finite element simulations, it has been determined that the 9-cell waffle geometry displays optimal stress transfer behavior as well as limited outward fragmentation.
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Undergraduate Thesis
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