Date of Award
Spring 2024
Document Type
Thesis
Degree Name
Master of Science (MS)
Department
Mechanical Engineering
First Advisor
John Moore
Abstract
A full understanding of the behavior of binder materials under shock loading is required for effective simulation of heterogeneous polymer-binder-explosives (PBX) and polymer-binder-surrogate (PBS) systems. An accurate simulation is critical for the ultimate goal of designing meso-scale heterogeneous PBS systems. The binder materials studied here is an ultraviolet sensitive resin (UV resin). The UV resin is manufactured by AnyCubic. It is a glassy thermoset polymer and is known to be similar to polymethyl methacrylate (PMMA) both in mechanical properties and in chemical makeup. This material was chosen as it can be additively manufactured, and it will present a lower impedance than explosive or surrogate-explosive grains suspended within, which will be critical when studying such heterogeneous systems. Model calibration will be carried out with different methods of increasing complexity. First the conventional impedance matching method will be used to determine equation of state parameters. Second, a modified impedance matching method will be used to determine equation of state parameters while considering the strength of the target materials. Finally, the multiple output genetic algorithm (MOGA) built into DAKOTA (an optimization toolbox developed by Sandia National Lab) will be used to optimize an equation of state parameters and strength model parameters simultaneously. Finaly, various additional tests will be examined to determine how they could further refine the results of a future optimization process. Tests include symmetric plate impact, pressure-shear plate impact, Taylor-Anvil tests, and ballistic impact.