Development and Experimental Validation of Microstructure- and Chemistry-Aware Continuum Models of Energetic Materials
Abstract
Despite six decades of effort, predicting the response of energetic materials to mechanical insults, particularly the shock to detonation transition (SDT), continues to be a challenge. At present, SDT is modeled through a family of reactive burn models, the evolution laws in which are obtained empirically by fitting model predictions with experimental data. Any change in the material descriptors can weaken the prediction accuracy of the models. The goal of the proposed effort is to use mesoscale simulations to develop evolution laws for the reactive burn models that are sensitive to the underlying microstructure and chemistry. We plan to accomplish this goal through the following integrated theoretical, computational and experimental investigations that span mechanics, chemistry and chemical engineering. (i) Incorporate reaction chemistry into the constitutive description of energetic materials and implement the resulting chemo-mechanical constitutive models in mesoscale simulations. (ii) Atomic scale simulations will be carried out to determine the reaction pathways and reaction rates of decomposition as a function of temperature and state of stress, which will inform the continuum models. (iii) A robust computational methodology will be developed to solve the coupled field equations that represent multi-physics and multiple phases in 2D and 3D. (iv) The computational framework will be used to implement the chemo-mechanical constitutive models in 2D and 3D meso-scale simulations. (v) Experiments will be designed and conducted to image the deformation and temperature fields associated with individual hot spots. (vi) Instrumented SDT studies will be carried out on energetic materials, the microstructure of which is systematically varied. Outcomes of the proposed work will contribute to enhancing DoD’s capabilities to simulate the performance of real-life energetic components accurately and design of insensitive munitions.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Mar 07, 2023
- Source ID
- FA95502110395
Entities
People
- Pradeep Guduru
Organizations
- Air Force Office of Scientific Research
- Brown University
- United States Air Force