Coupled Mechanical−Thermal Model for Numerical Simulations of Polymer−Bonded Explosives under Low−Velocity Impacts

Due to the significant thermal−mechanical effects during hot spot formation in polymer‐bonded explosives (PBXs), a coupled mechanical−thermal constitutive relationship was developed to predict the mechanical behaviors and the thermal reactions of polymer‐bonded explosives (PBXs), which includes visc...

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Bibliographic Details
Published in:Propellants, explosives, pyrotechnics explosives, pyrotechnics, 2020-05, Vol.45 (5), p.823-832
Main Authors: Xiao, Youcai, Fan, Chenyang, Wang, Zhijun, Sun, Yi
Format: Article
Language:English
Subjects:
Computer simulation
Constitutive relationships
Empirical analysis
Equation of state
Equations of state
Explosive impact tests
Explosives
Finite element method
Ignition
Impact prediction
Impact velocity
Mathematical models
Mechanical behavior
Numerical simulations
PBX
Polymers
Reaction kinetics
Split Hopkinson pressure bars
Temperature effect
Thermal analysis
Thermal simulation
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Summary:Due to the significant thermal−mechanical effects during hot spot formation in polymer‐bonded explosives (PBXs), a coupled mechanical−thermal constitutive relationship was developed to predict the mechanical behaviors and the thermal reactions of polymer‐bonded explosives (PBXs), which includes viscoelastic responses, the Visco‐SCRAM model, equations of state, and the Arrhenius first‐order chemical kinetics model. The proposed model was implemented in the finite element code ABAQUS using the user subroutine VUMAT. Split Hopkinson pressure bar (SHPB) and confined Steven test simulations for PBX 9501 were performed to verify the model and understand the stress and temperature fields under different low impact velocities. The results predicted by the proposed model agreed well with the experimental results. This suggested that the model could be used to better simulate the thermal−mechanical responses of explosives. Moreover, compared with the previous analysis models and methods, the method in this paper has wider applicability because it does not require an empirical ignition criterion and hotspot model. It can provide a reference for the study of the thermal−mechanical responses of explosives and the localized ignition problem under low amplitude impact scenarios.
ISSN:0721-3115
1521-4087
DOI:10.1002/prep.201900345