Energy localization in HMX-Estane polymer-bonded explosives during impact loading

Barua, Ananda; Horie, Y.; Zhou, Min

doi:10.1063/1.3688350

Cited by 108 publications

(48 citation statements)

References 28 publications

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“…Such scenarios are quite relevant because when the impact velocity is high, ignition can occur within a short time upon contact, and the stress wavefront may not have reached any boundary of the sample yet. We note that that in Barua & Zhou (2011a) and Barua et al (2012), the conditions are such that stress waves reflect from opposite boundaries of the samples for the time duration analysed. Under those conditions, the highest temperature may not be at the impact face.…”

Section: Resultsmentioning

confidence: 99%

“…This is a two-dimensional model and the conditions of plane-strain prevail at length scales higher than the size scale of the material heterogeneities. The calculations use a recently developed cohesive finite element method modelling framework to capture the coupled thermal and mechanical processes in the microstructure (Barua & Zhou 2011a;Barua et al 2012). Individual constituents are modelled using Lagrangian elements and fracture and subsequent contacts are tracked explicitly using a contact algorithm.…”

Section: Configuration Of Analysismentioning

confidence: 99%

“…In general, grains experience high stresses and fracture, leading to subsequent frictional interactions across crack surfaces. Frictional dissipation can be the most important source of heating that leads to local temperature rises and to the formation of hot spots (Dienes et al 2006;Barua & Zhou 2011a;Barua et al 2012). The spatial distribution, size and temperature of the hot spots are critical measures for assessing the ignition sensitivity of a PBX (Tarver et al 1996;Menikoff 2004).…”

Section: Introductionmentioning

confidence: 99%

“…The microstructural samples (figure 1) have an aspect ratio of 5 : 1 (15 × 3 mm), allowing the transient wave propagation process resulting from normal impact to be resolved. A recently developed Lagrangian cohesive finite element framework is used to quantify the effects of microstructure and thermal-mechanical processes such as matrix deformation, interfacial debonding and fracture of grains on hot spot formation (Barua & Zhou 2011a,b;Barua et al 2012). Simulations are carried out for a range of load intensity as measured by imposed load face velocity, grain volume fraction and grain/binder interface strength.…”

Section: Introductionmentioning

confidence: 99%

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Microstructural level response of HMX–Estane polymer-bonded explosive under effects of transient stress waves

2012

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The effect of transient stress waves on the microstructure of HMX-Estane, a polymerbonded explosive (PBX), is studied. Calculations carried out concern microstructures with HMX grain sizes on the order of 200 mm and grain volume fractions in the range of 0.50-0.82. The microstructural samples analysed have an aspect ratio of 5 : 1 (15 × 3 mm), allowing the transient wave propagation process resulting from normal impact to be resolved. Boundary loading is effected by the imposition of impact face velocities of 50-200 m s −1 . Different levels of grain-binder interface strength are considered. The analysis uses a recently developed cohesive finite element framework that accounts for coupled thermal-mechanical processes involving deformation, heat generation and conduction, failure in the forms of microcracks in both bulk constituents and along grain/matrix interfaces, and frictional heating along crack faces. Results show that the overall wave speed through the microstructures depends on both the grain volume fraction and interface bonding strength between the constituents and that the distance traversed by the stress wave before the initiation of frictional dissipation is independent of the grain volume fraction but increases with impact velocity. Energy dissipated per unit volume owing to fracture is highest near the impact surface and deceases to zero at the stress wavefront. On the other hand, the peak temperature rises are noted to occur approximately 2-3 mm from the impact surface. Scaling laws are developed for the maximum dissipation rate and the highest temperature rise as functions of impact velocity, grain volume fraction and grain-binder interfacial bonding strength.

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Section: Resultsmentioning

confidence: 99%

Section: Configuration Of Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microstructural level response of HMX–Estane polymer-bonded explosive under effects of transient stress waves

2012

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“…The results showed the importance of both plasticity and friction along the surfaces of HMX grains in heating and hotspot formation. The studies of Barua et al have concerned several issues, including the development of a framework to account for fracture, contact and frictional heating in microstructures of PBXs, 25 contributions to heating of dissipation through fracture, friction in both HMX grains and the polymer binder (as well as along the grain-binder interfaces) 30 and the effects of the transient nature of loading on the contributions of the various heating mechanisms. 31 The study of Mas et al 32 accounts for grain scale features in a coarse grained simulation by using the method of cells to model split Hopkinson pressure bar tests on PBXs.…”

Section: Introductionmentioning

confidence: 99%

Analysis of thermomechanical response of polycrystalline HMX under impact loading through mesoscale simulations

Hardin¹,

Rimoli²,

Zhou³

2014

AIP Advances

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We investigate the response of polycrystalline HMX 3,5,3,5, under impact loading through a 3-dimensional mesoscale model that explicitly accounts for anisotropic elasticity, crystalline plasticity, and heat conduction. This model is used to quantify the variability in temperature and stress fields due to random distributions of the orientations of crystalline grains in HMX under the loading scenarios considered. The simulations carried out concern the response of fully dense HMX polycrystalline ensembles under impact loading at imposed boundary velocities from 50 to 400 m/s. The polycrystalline ensemble studied consists of a geometrically arranged distribution of bi-modally sized and shaped grains. To quantify the effect of crystalline slip, two models with different numbers of available slip systems are used, reflecting differing characterizations of the slip systems of the HMX molecular crystal in the literature. The effects of microstructure and anisotropy on the distribution of heating and stress evolution are investigated. The results obtained indicate that crystalline response anisotropy at the microstructure level plays an important role in influencing both the overall response and the localization of stress and temperature. The overall longitudinal stress is up to 16% higher and the average temperature rise is only half in the material with fewer potential slip systems compared to those in the material with more available slip systems. Local stresses can be as high as twice the average stresses. The results show that crystalline anisotropy induces significant heterogeneities in both mechanical and thermal fields that previously have been neglected in the analyses of the behavior of HMX-based energetic materials. C 2014 Author(s)

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A Eulerian Level Set‐based Framework for Reactive Meso‐scale Analysis of Heterogeneous Energetic Materials

Kumar¹,

Udaykumar²

2018

Dynamic Damage and Fragmentation

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Energy localization in HMX-Estane polymer-bonded explosives during impact loading

Cited by 108 publications

References 28 publications

Microstructural level response of HMX–Estane polymer-bonded explosive under effects of transient stress waves

Microstructural level response of HMX–Estane polymer-bonded explosive under effects of transient stress waves

Analysis of thermomechanical response of polycrystalline HMX under impact loading through mesoscale simulations

A Eulerian Level Set‐based Framework for Reactive Meso‐scale Analysis of Heterogeneous Energetic Materials

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