Strain Rate and Microstructure Dependent Failure in HTPB/HMX Based Energetic Materials
Abstract
In this work, the mechanical properties and microstructure of Hydroxyl-terminated polybutadiene (HTPB)-HMX based materials are studied using experimental methods; dynamic nano impact experiment to define the viscoplastic stress-strain model and Micro-Raman Spectroscopy (MRS) to obtain Cohesive zone parameters and, Cohesive finite element method (CFEM) as numerical methods. A power law viscoplastic constitutive model was fit to the experimental data obtained in order to predict rate dependent constitutive behaviors of interfaces, particle, and matrix. These parameters are adapted, along with a viscoplastic model, to a cohesive finite element method and applied to model of different shapes of microstructure. In order to observe the effect of microstructure on the failure properties and ‘hot spot’ formation in HTPB/HMX based materials, 2 dimensional models of different microstructure shapes and densities were created using a finite element analysis code. The shapes considered were circle, diamond, a PBX undefined shape.
Degree
M.S.A.A.
Advisors
Gunduz, Purdue University.
Subject Area
Aerospace engineering
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