Intermediate strain rate characterization of a plastic-bonded explosive composition

Picart, Didier; Biessy, Maxime; Brigolle, J.L.

doi:10.1051/dymat/2009048

Cited by 3 publications

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“…The quasi-constant internal friction angle deduced from the data enables the determination of the constitutive law knowing the uniaxial strain rate dependence and the confining pressure during the test. Moreover, the rapid increase of the unconfined maximum stress observed in Figure 4 and also obtained for similar material using dynamic mechanical analysis experiments [30][31] can be confirmed using highly confined dynamic triaxial experiments. The macroscopic behavior is similar to that observed for concrete and rocks.…”

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confidence: 74%

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Dynamic behavior of an aggregate material at simultaneous high pressure and strain rate: SHPB triaxial tests

Bailly

Delvare

Vial

et al. 2011

International Journal of Impact Engineering

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International audienceLow velocity impacts on energetic materials induce plastic deformations and sliding friction which can lead to ignition. If some ignition criteria have been proposed, the remaining difficulty is to characterize the mechanical behavior of the material when submitted to the corresponding solicitations (high pressure and high strain rate). Thus, a technique based on the Split Hopkinson Pressure Bars system is proposed to carry out a triaxial compression test. A cylindrical specimen is placed into a confining ring and is compressed by the system of bars. The ring prevents the radial extension of the specimen and creates a lateral confining pressure. The material and dimensions chosen for the ring maintain a constant radial pressure during the test. Some tests were carried out on an inert aggregate material and proved the validity of this experimental device. The experimental data processing shows the influence of both the pressure and the strain rate. The shear stresses, which contribute to thermal dissipation and then to the ignition threshold, increase according to the pressure

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confidence: 74%

“…A sudden evolution of the slope is observed around 10-100 s -1 , the strength recorded at 1000 s -1 being approximately 5 times the strength at 10 -4 s -1 . The same observation was made for high explosive behaviors [30][31]. The mechanisms governing this evolution are not yet fully understood.…”

Section: Methodsmentioning

confidence: 52%

Dynamic behavior of an aggregate material at simultaneous high pressure and strain rate: SHPB triaxial tests

Bailly

Delvare

Vial

et al. 2011

International Journal of Impact Engineering

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“…The unconfined compressive behaviour of the studied material displays a highly rate-dependent quasi-brittle (concrete-like) behaviour, characterized by a peak stress of 18 MPa at 10 −6 s −1 , but 50 MPa at 300 s −1 [5]. The strain at peak stress tends to increase with strain rate.…”

Section: Hopkinson Bar Experimentsmentioning

confidence: 90%

Mechanical and microstructural characterization of a HMX-based pressed explosive: Effects of combined high pressure and strain rate

Trumel

Lambert²,

Biessy

2012

EPJ Web of Conferences

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The paper presents a study of the combined effects of strain rate and confining pressure on the behaviour and microstructure evolutions of a HMX-based explosive. Hopkinson bar compression experiments are carried-out on samples confined with a brass sleeve. The latter is instrumented in order to determine the confining pressure on the explosive sample, directly function of the sleeve thickness and yield strength. A sample confined at 75 MPa and deformed at 250 s −1 is recovered, cross-sectioned and studied using optical microscopy. Distributed microplasticity and microcracking appear similar to those induced by confined quasi-static experiments, indicating that stress triaxiality is the most important loading parameter. The sample also displays a large shear macrocrack, resulting from the formation of an adiabatic shear band. Shear banding seems to proceed by strong plastic strain gradients, followed by dynamic re-crystallization. Further strong thermal effects are observed, resulting in local reactive melting.

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Mechanical Behaviour of Pressed HMX and TATB-Based PBXs During Low-Velocity Impact

Picart,

Tchikladze,

Camus

2023

J. dynamic behavior mater.

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Intermediate strain rate characterization of a plastic-bonded explosive composition

Cited by 3 publications

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Dynamic behavior of an aggregate material at simultaneous high pressure and strain rate: SHPB triaxial tests

Dynamic behavior of an aggregate material at simultaneous high pressure and strain rate: SHPB triaxial tests

Mechanical and microstructural characterization of a HMX-based pressed explosive: Effects of combined high pressure and strain rate

Mechanical Behaviour of Pressed HMX and TATB-Based PBXs During Low-Velocity Impact

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