Hopkinson Bar Studies of a PBX Simulant

Drodge, Daniel; Addiss, John; Williamson, David M.; Proud, W. G.

doi:10.1063/1.2833123

Cited by 7 publications

(7 citation statements)

References 2 publications

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“…PBXs behave quite differently at high strain rates compared with quasi-static cases. 19 The strength of the material, which is represented by the maximum stress, increases as the strain rate increases. This dependence is also influenced by ambient temperature.…”

Section: Introductionmentioning

confidence: 99%

Effects of temperature and strain rate on the dynamic responses of three polymer-bonded explosives

Qin

et al. 2011

The Journal of Strain Analysis for Engineering Design

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Polymer-bonded explosives (PBXs) are typical particulate composites of energetic crystals in a polymer matrix, which have a volume fraction of 60% to 95%. They are engineered to provide reliable performance and maximum safety envelopes through reduction of their sensitivity. There are three kinds of polymer-bonded explosive materials; namely, PBX1, PBX2, and PBX3. The last two polymer-bonded explosives were recently invented, in search of the more insensitive polymer-bonded explosive but with high detonation energy also. To investigate the dynamic response of new materials, the uniaxial compressive stress-strain behavior of the three polymer-bonded explosives was investigated as a function of temperature and strain rate. Constant and non-constant strain rate loading experiments were conducted in the use of pulse shapers. By comparing two different loads, the strain rate effect of these materials was found to depend on the instantaneous strain rate. The variations in failure stress, and failure strain with temperature, strain rate, and material composition were examined. The dependence of compressive strength on temperature and strain rate can be attributed to the Young's modulus and fracture surface energy according to Griffith criteria for fracture. The axial splitting caused by brittle fracture for most conditions was also investigated. Another failure mode of PBX2 agreed with the Mohr's failure mode criterion. All results show that PBX2 has more stable mechanical behavior and higher detonation performance.

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Section: Introductionmentioning

confidence: 99%

Effects of temperature and strain rate on the dynamic responses of three polymer-bonded explosives

Qin

et al. 2011

The Journal of Strain Analysis for Engineering Design

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“…Meanwhile, some studies have determined the dynamic mechanical properties of PBXs [Blumenthal et al, 2000;Drodge et al, 2007;Siviour et al, 2008]. For instance, Drodge et al [2007] measured the stress-strain curves of the HTPB/sugar propellant simulant at a strain rate of ∼1600 s −1 within the temperature range of 50 • C-100 • C. Furthermore, Li et al [2012] studied the fracture behavior of PBX by performing quasi-static and dynamic Brazilian tests using MTS machine and split Hopkinson pressure bar (SHPB), respectively. These studies were mainly focused on the stressstrain curves, without detailed analysis of the dynamic fracture parameters.…”

Section: Introductionmentioning

confidence: 99%

Studies on the Dynamic Fracture Properties and Failure Modes of a PBX

Chen

Cheng

Lin

et al. 2014

Int. J. Appl. Mechanics

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Polymer-bonded explosives (PBXs) are particulate composite materials composed of crystalline explosive grains bound in a relatively soft polymeric binder. It is important to optimize the fracture properties, while still maintaining the low sensitiveness and high explosiveness of PBX. This paper describes a study on the fracture properties and failure modes of a PBX by adopting a newly proposed dynamic fracture experimentation method -notched semi-circular bend (NSCB) specimen loaded with split Hopkinson pressure bar (SHPB) which was used in this study. This method offers the advantage of simultaneously determining the fracture initiation toughness, fracture energy, fracture propagation toughness and fracture velocity. The crack propagation is monitored by using a synchronous high-speed camera, which allows the observation of strain field history via digital image correlation process. The experimental results indicate that both the initiation toughness and the propagation toughness linearly increase with loading rate. The propagation fracture toughness is found to increase with fracture velocity, and a limiting fracture velocity is obtained. The failure modes are interpreted by using various theoretical models. Results suggest that the debonding strength of the binder is much smaller than the crystal fracture strength. The tensile strength is similar to the debonding strength, while the compression strength is somewhere intermediate between them.

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Section: Introductionmentioning

confidence: 99%

“…Some research works on dynamic mechanical properties of PBXs have been done [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. The dynamic and static mechanical properties of PBXs were very different [5]. Furthermore, researchers have paid more attention to the effect of temperature on dynamic mechanical response of PBXs [6][7][8][9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Mechanical Properties and Constitutive Relation of an Aluminized Polymer Bonded Explosive at Low Temperatures

Lin¹,

Xu²,

Chen³

et al. 2014

Shock and Vibration

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Polymer bonded explosives (PBXs) are widely used as energetic fillings in various warheads, which maybe are utilized under extreme environments, such as low or high temperatures. In this paper, the dynamic response of an aluminized polymer bonded explosive was tested at a range of temperatures from −55°C to −2°C and a fixed loading strain rate (~700 s−1) with the split Hopkinson pressure bar (SHPB). The PBX tested is aluminized, which contains 76 wt% RDX, 20 wt% aluminum powder, and 4 wt% polymer binder, respectively. The results show that the effect of temperature on the strength of the PBX is obvious at the tested strain rates. Based on the experimental results and prophase studies, a constitutive model was obtained, in which the effect of temperature and strain rate were considered. The modeling curves fit well with the experimental results, not only at low temperature under 0°C, but also at room temperature (20°C). The model may be used to predict the dynamic performances of the PBXs in various environments.

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Hopkinson Bar Studies of a PBX Simulant

Cited by 7 publications

References 2 publications

Effects of temperature and strain rate on the dynamic responses of three polymer-bonded explosives

Effects of temperature and strain rate on the dynamic responses of three polymer-bonded explosives

Studies on the Dynamic Fracture Properties and Failure Modes of a PBX

Dynamic Mechanical Properties and Constitutive Relation of an Aluminized Polymer Bonded Explosive at Low Temperatures

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