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Dynamic Mechanical Damage and Non-Shock initiation of a New Polymer Bonded Explosive during Penetration

Complexities of heating mechanisms make it difficult to investigate the safety of a polymer bonded explosive (PBX) charge of earth-penetrating-weapons (EPWs) during penetration. In this paper, the dynamic damage and non-shock initiation of PBX1314 (60 wt % hexahydro-1, 3, 5-trinitro-1, 3, 5-s-triazi...

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Autores principales: Li, Xiao, Liu, Yizhi, Sun, Yi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7362080/
https://www.ncbi.nlm.nih.gov/pubmed/32545789
http://dx.doi.org/10.3390/polym12061342
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author Li, Xiao
Liu, Yizhi
Sun, Yi
author_facet Li, Xiao
Liu, Yizhi
Sun, Yi
author_sort Li, Xiao
collection PubMed
description Complexities of heating mechanisms make it difficult to investigate the safety of a polymer bonded explosive (PBX) charge of earth-penetrating-weapons (EPWs) during penetration. In this paper, the dynamic damage and non-shock initiation of PBX1314 (60 wt % hexahydro-1, 3, 5-trinitro-1, 3, 5-s-triazine (RDX), 16 wt % aluminum, 24 wt % hydroxy-terminated polybutadiene (HTPB)) during penetration is investigated through experiments and simulations. In the experiments, steel projectiles filled with PBX1314 are launched to penetrate concrete targets. In the results, non-shock initiations occur on the tail surface of PBX1314 along with mechanical damage of the tail and middle part of PBX1314. A dynamic damage and initiation model is proposed to characterize the effects of microcracks on the mechanical and thermal responses of PBX1314. Investigation based on the model suggests that microcrack interfacial friction plays significant roles in damage, heat generation and localization in PBX1314. A non-shock initiation criterion is developed based on macroscale variables in PBX1314. Numerical simulations of the penetration experiments are performed by using the proposed model and criterion. The mechanical damage and non-shock initiation of PBX1314 in the experiments are successfully predicted. The simulation results indicate that the tail of PBX1314 impacts the projectile repeatedly during penetration. Finally, the initiation criterion is satisfied because of frictional heat localization near microcrack surfaces and initiation is activated in the tail of PBX1314.
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spelling pubmed-73620802020-07-21 Dynamic Mechanical Damage and Non-Shock initiation of a New Polymer Bonded Explosive during Penetration Li, Xiao Liu, Yizhi Sun, Yi Polymers (Basel) Article Complexities of heating mechanisms make it difficult to investigate the safety of a polymer bonded explosive (PBX) charge of earth-penetrating-weapons (EPWs) during penetration. In this paper, the dynamic damage and non-shock initiation of PBX1314 (60 wt % hexahydro-1, 3, 5-trinitro-1, 3, 5-s-triazine (RDX), 16 wt % aluminum, 24 wt % hydroxy-terminated polybutadiene (HTPB)) during penetration is investigated through experiments and simulations. In the experiments, steel projectiles filled with PBX1314 are launched to penetrate concrete targets. In the results, non-shock initiations occur on the tail surface of PBX1314 along with mechanical damage of the tail and middle part of PBX1314. A dynamic damage and initiation model is proposed to characterize the effects of microcracks on the mechanical and thermal responses of PBX1314. Investigation based on the model suggests that microcrack interfacial friction plays significant roles in damage, heat generation and localization in PBX1314. A non-shock initiation criterion is developed based on macroscale variables in PBX1314. Numerical simulations of the penetration experiments are performed by using the proposed model and criterion. The mechanical damage and non-shock initiation of PBX1314 in the experiments are successfully predicted. The simulation results indicate that the tail of PBX1314 impacts the projectile repeatedly during penetration. Finally, the initiation criterion is satisfied because of frictional heat localization near microcrack surfaces and initiation is activated in the tail of PBX1314. MDPI 2020-06-13 /pmc/articles/PMC7362080/ /pubmed/32545789 http://dx.doi.org/10.3390/polym12061342 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Li, Xiao
Liu, Yizhi
Sun, Yi
Dynamic Mechanical Damage and Non-Shock initiation of a New Polymer Bonded Explosive during Penetration
title Dynamic Mechanical Damage and Non-Shock initiation of a New Polymer Bonded Explosive during Penetration
title_full Dynamic Mechanical Damage and Non-Shock initiation of a New Polymer Bonded Explosive during Penetration
title_fullStr Dynamic Mechanical Damage and Non-Shock initiation of a New Polymer Bonded Explosive during Penetration
title_full_unstemmed Dynamic Mechanical Damage and Non-Shock initiation of a New Polymer Bonded Explosive during Penetration
title_short Dynamic Mechanical Damage and Non-Shock initiation of a New Polymer Bonded Explosive during Penetration
title_sort dynamic mechanical damage and non-shock initiation of a new polymer bonded explosive during penetration
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7362080/
https://www.ncbi.nlm.nih.gov/pubmed/32545789
http://dx.doi.org/10.3390/polym12061342
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