Frictional properties of explosives

Amuzu, J. K. A.; Briscoe, B.J.; Chaudhri, M. Munawar

doi:10.1088/0022-3727/9/1/019

Cited by 36 publications

(12 citation statements)

References 13 publications

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“…Work by Amuzu et al [23] reported a study on the frictional properties of a set of energetic materials and obtained a Vickers Hardness Number (VHN) of 405 MPa for β-HMX although they did not specify the indented face or crystal orientation. Palmer and Field [22] studied the deformation and fracture behaviour of β-HMX by compression, wettability and indentation and etching (Vickers indentations on a (010) face).…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of β-HMX

Gallagher

Miller

Sheen

et al. 2015

Chemistry Central Journal

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BackgroundFor a full understanding of the mechanical properties of a material, it is essential to understand the defect structures and associated properties and microhardness indentation is a technique that can aid this understanding.ResultsThe Vickers hardness on (010), {011} and {110} faces lay in the range of 304–363 MPa. The Knoop Hardnesses on the same faces lay in the range 314–482 MPa. From etching of three indented surfaces, the preferred slip planes have been identified as (001) and (101). For a dislocation glide, the most likely configuration for dislocation movement on the (001) planes is (001) [100] (|b| = 0.65 nm) and for the (101) plane as (101) (|b| = 1.084 nm) although (101) [010] (|b| = 1.105 nm) is possible. Tensile testing showed that at a stress value of 2.3 MPa primary twinning occurred and grew with increasing stress. When the stress was relaxed, the twins decreased in size, but did not disappear. The twinning shear strain was calculated to be 0.353 for the (101) twin plane.ConclusionsHMX is considered to be brittle, compared to other secondary explosives. Comparing HMX with a range of organic solids, the values for hardness numbers are similar to those of other brittle systems. Under the conditions developed beneath a pyramidal indenter, dislocation slip plays a major part in accommodating the local deformation stresses.Graphical abstractHMX undergoing tensile testing.Electronic supplementary materialThe online version of this article (doi:10.1186/s13065-015-0091-6) contains supplementary material, which is available to authorized users.

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Section: Introductionmentioning

confidence: 99%

Mechanical properties of β-HMX

Gallagher

Miller

Sheen

et al. 2015

Chemistry Central Journal

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“…The coefficient of friction can be taken from the literature where it is available. Some frictional contact parameters are appropriately inferred in previous work [25].…”

Section: Interface Contactmentioning

confidence: 99%

Material Point Method Simulation of the Equation of State of Polymer-Bonded Explosive under Impact Loading at Mesoscale

Zhang

Sang

et al. 2020

Processes

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Mesoscale simulation using the material point method (MPM) was conducted to study the pressure–volume (PV) variations of Octahydro-1,3,5,7-Tetranitro-1,2,3,5-Tetrazocine (HMX)/Estane polymer-bonded explosive (PBX) under impact loading. The PV isotherms and Hugoniot data were calculated for the different porosities and binder volume fractions. The PV isotherms were used to determine the parameters for the Birch– Murnaghan equation of state (EOS) for the PBX. From the EOS, the isothermal bulk modulus (K0) and its pressure derivative (K′0) were calculated. Additionally, the pseudo particle velocity and pseudo shock velocity variations were used to obtain the bulk wave speed c and dimensionless coefficient s for the Mie–Grüneisen EOS. The simulations provide an alternative approach for determining an EOS that is consistent with experimental observations.

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“…We calibrate ͑17͒ using the constants in Table I and through fitting to experimental data. 74 We further account for the temperature dependence of the elastic constants simply through a linear relation that interpolates between the value of the elastic constants at 0 K and zero at the melting temperature.…”

Section: Crystal Plasticity Of Petn Crystalsmentioning

confidence: 99%

Shock-induced subgrain microstructures as possible homogenous sources of hot spots and initiation sites in energetic polycrystals

2010

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The purpose of this work is to assess the feasibility of a homogeneous-or defect-free-initiation mechanism for high energetic materials in which initiation is a direct consequence of the heterogeneity of crystal plasticity at the subgrain scale. In order to assess the feasibility of these mechanisms, we develop a multiscale model that explicitly accounts for three scales: ͑i͒ the polycrystalline structure at the macroscale, ͑ii͒ singlecrystal plasticity-including subgrain microstructure formation-at the mesoscale, and ͑iii͒ chemical kinetics at the molecular scale. An explicit construction gives the effective or macroscopic behavior of plastically deforming crystals with microstructure, and enables the reconstruction of optimal microstructures from the computed macroscopic averages. An intrinsic feature of the optimal deformation microstructures is the presence of highly localized regions of plastic deformation or slip lines. Temperatures, strain rates, and pressures in these slip lines rise well in excess of the average or macroscopic values. Slip lines thus provide a plentiful supply of likely initiation sites, or hotspots, in defect-free crystals. We have assessed this initiation mechanism by simulating a PETN plate impact experiment and comparing the resulting predictions with experimental pop-plot data. The computed characteristic exponents are in the ballpark of experimental observation.

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Frictional properties of explosives

Cited by 36 publications

References 13 publications

Mechanical properties of β-HMX

Mechanical properties of β-HMX

Material Point Method Simulation of the Equation of State of Polymer-Bonded Explosive under Impact Loading at Mesoscale

Shock-induced subgrain microstructures as possible homogenous sources of hot spots and initiation sites in energetic polycrystals

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