Tensile test of HMX/HTPB macro-composites

The mechanical behavior and failure of plastic bonded explosives (PBXs) under loading conditions depend on the adhesive and cohesive properties and the debonding of the ingredients and their interfaces. A new experimental approach has been done with the aim of measuring the debonding in macroscopic binder/crystal composites using a mechanical testing machine. Therefore macroscopic, centimeter-sized crystal/binder/anchor ""sandwiches"" were produced and measured in with a 10 kN load cell, and the tests were monitored by a video system. The investigations revealed yield points, maximum stresses, and rupture energies of the composites. However, various complications occurred during some tests, such as inclined crystal orientations, partial debonding and even crystal cleavage. Details and results of the testing method, sample preparation and evaluation of tensile data are presented and discussed.