New framework for constitutive modeling and numerical simulation of energetic crystals
Abstract
It has been long recognized that hot spots dominate initiation in explosives. Since hot spots are local peaks in the fluctuation of temperature fields it is imperative to correctly capture the physicaldissipative mechanisms at the relevant length scale i.e. at the scale of the energetic crystal. Despiteextensive efforts to develop computational models representative of the microstructure of energeticmaterial, the description of the plastic deformation remains particularly challenging. While experimental and computational research has been performed to characterize the anisotropic elastic coefficients of energetic crystal, a full 3-D constitutive modeling of its nonlinear mechanicalresponse is lacking.The central goal of this proposal is to develop new models to respond to the need to realistically predict accumulated plastic deformation in low symmetry energetic crystals undergoing dynamic events. The key novelty of the proposed research is that a realistic description of plastic deformation during dynamic events can only be achieved if accurate plasticity models areavailable at mesoscale, i.e. the crystal scale. The novel solution put forward is a new descriptionof the energetic crystal behavior, which respects the inherent symmetry of the lattice structure.Currently it is assumed that irrespective of the crystal type the behavior at the grain level can bemodeled with the same constitutive law. It is proposed to substitute this "one size fits all" approach and develop new crystal-level plasticity models accounting for the specific crystalline symmetries. In order to describe the initiation in energetic material through the occurrence of hot spots, a new computationally-efficient framework will be developed using appropriate multiscale techniques in conjunction with these new formulations describing the constituent crystal behavior.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jul 11, 2018
- Source ID
- FA95501810256
Entities
People
- Benoit Revil-baudard
Organizations
- Air Force Office of Scientific Research
- United States Air Force
- University of Florida