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Open AccessArticle

Modelling Microstructural Deformation and the Failure Process of Plastic Bonded Explosives Using the Cohesive Zone Model

1
State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China
2
Shanghai Space Propulsion Technology Research Institute, Shanghai Academy of Spaceflight Technology, China Aerospace Science and Technology Corporation, Shanghai 200125, China
*
Author to whom correspondence should be addressed.
Materials 2019, 12(22), 3661; https://doi.org/10.3390/ma12223661
Received: 31 August 2019 / Revised: 29 October 2019 / Accepted: 4 November 2019 / Published: 7 November 2019
(This article belongs to the Special Issue Micromechanics: Experiment, Modeling and Theory)
A microstructure finite element method combining the cohesive zone model (CZM) is used to simulate the mechanical behavior, deformation, and failure of polymer-bonded explosive (PBX) 9501 under quasi-static loading. PBX 9501 consists of Cyclotetramethylene tetranitramine (HMX) filler particles with a random distribution packaged in a polymeric binder. The particle is treated as elastic and the binder as viscoelastic. Cohesive elements with a bilinear softening law are inserted into the particle/binder interface, the HMX particle, and the binder to study the interface’s debonding and failure evolution. Macroscopic stress–strain curves homogenized across the microstructure under tension and compression with different strain rates are basically consistent with the experimental data. The interface debonding approximately vertical to the loading direction is the primary failure mechanism under tension, while shear failure along the interfaces and particle fracture plays a significant role under compression. The effects of interface strengths and strain rates on the performance of PBX 9501 are also evaluated. The tensile and compressive strengths are dependent on the interface strength and strain rate, but the failure paths are insensitive. This model is shown to accurately predict macroscopic responses and improve our understanding of the relationship between the mechanical behavior and microstructure of PBX 9501. View Full-Text
Keywords: polymer-bonded explosives; mechanical behavior; cohesive zone model; bilinear softening law; failure mechanism polymer-bonded explosives; mechanical behavior; cohesive zone model; bilinear softening law; failure mechanism
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Dai, K.; Lu, B.; Chen, P.; Chen, J. Modelling Microstructural Deformation and the Failure Process of Plastic Bonded Explosives Using the Cohesive Zone Model. Materials 2019, 12, 3661.

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