Plastic bonded explosives are unique materials with complex properties. Research has deeply explored the reactive nature of these materials, but their mechanical performance has been largely neglected. Due to the aggregate composition of solid crystals covered in polymer binders which are heated and pressed into parts, the mechanical response of these materials is extremely complex. The primary objective of this thesis was to develop a unique fixture to allow for a smaller explosive specimen to be installed and tested under multiaxial loading conditions. The design was heavily dependent on set requirements as well as production and use preferences, and a thorough analysis was performed to verify the fixture correctly loaded the specimen without concerns of fixture damage or improper loading due to excessive strain across the fixture. Once fabricated, a test series was conducted on explosive specimens to validate the fixture’s capabilities and provide an initial look at the mechanical response of a complex aggregate material loaded in various combinations of stress states.Analytical methods were again relied on to convert load data to an expected stress state in the unique geometry to provide a first look at the material response.