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

Chen, R.; Cheng, Long; Lin, Yuliang; Lu, Fangyun

doi:10.1142/s1758825114500392

Cited by 11 publications

(7 citation statements)

References 31 publications

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“…The first method is to change the wave impedance ratio and increase the transmission coefficient by selecting materials with lower wave impedance as the pressure bar materials, which fundamentally increases the transmitted pulse signal. Aluminum alloy, with a density of about one-third of that of steel, has become a common material for improving the impedance matching between the pressure bar and the specimen [71][72][73][74][75][76][77][78][79][80][81][82][83][84][85]. For specimens with smaller wave impedance, such as soft materials and polymer materials, polymeric materials such as polycarbonate (PC), nylon, polymethyl methacrylate (PMMA), polyethylene terephthalate (PET), and other polymeric materials can be used as the pressure bar materials [86][87][88][89][90][91][92][93][94][95][96][97][98][99][100][101][102][103][104][105].…”

Section: Analysis and Matching Study Of Wave Impedance Between Pressu...mentioning

confidence: 99%

Review of SHPB Dynamic Load Impact Test Characteristics and Energy Analysis Methods

Yang,

Li,

Qiao

2023

Processes

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Since the split-Hopkinson pressure bar (SHPB) test technology was proposed, it has played an important role in the study of dynamic mechanical properties of materials under the impact of dynamic load. It is a major test technology for the study of dynamic mechanical properties of materials. The expansion of the range of materials studied has also posed a challenge to the SHPB test technique, requiring some improvements to the conventional SHPB test apparatus and analysis methods to meet the test conditions and ensure the accuracy of its results. Based on a systematic review of the development of the SHPB test technique and the test principles, the main factors that influence the test’s ability to meet the two basic assumptions at this stage are analyzed, and the ways to handle them are summarized. The stress wave dispersion phenomenon caused by the transverse inertia effect of the pressure bar means that the test no longer satisfies the one-dimensional stress wave assumption, while the pulse-shaping technique effectively reduces the wave dispersion phenomenon and also has the effect of achieving constant strain rate loading and promoting the dynamic stress equilibrium of the specimen. Impedance matching between the pressure bar and specimen effectively solves the problem of the test’s difficulty because the transmitted signal is weak, and the assumption that the stress/strain is uniformly distributed along the length of the specimen is not satisfied when studying low-wave impedance material with the conventional SHPB test device. The appropriate pressure bar material can be selected according to the value of the wave impedance of the test material. According to the wave impedance values of different materials, the corresponding suggestions for the selection of pressure bar materials are given. Moreover, a new pressure bar material (modified gypsum) for materials with very-low-wave impedance is proposed. Finally, for some materials (foamed concrete, aluminum honeycomb, porous titanium, etc.) that cannot meet the two basic assumptions of the test, the Lagrangian analysis method can be combined with SHPB test technology application. Based on the analysis and calculation of the energy conservation equation, the dynamic constitutive relationship of the materials can be obtained without assuming the constitutive relationship of the experimental materials.

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Section: Analysis and Matching Study Of Wave Impedance Between Pressu...mentioning

confidence: 99%

Review of SHPB Dynamic Load Impact Test Characteristics and Energy Analysis Methods

Yang,

Li,

Qiao

2023

Processes

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“…Unfortunately, PBX is brittle and possesses low strength. Tensile load‐induced brittle cracking is the primary cause of PBX failure [5–8]. During the manufacturing, transportation, and storage processes, cracks are easily initiated, which may create “hot spots”, cause accidental ignition, and thus seriously affect the security and reliability of the weapons system [9–13].…”

Section: Introductionmentioning

confidence: 99%

Digital Image Correlation Measurement of the Deformation and Failure in PBX Brazilian Discs Reinforced with CFRP Patches

Wang

Tang

Liu

et al. 2021

Propellants Explo Pyrotec

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Polymer‐bonded explosive (PBX) is a mechanical weak link in weapons systems. PBX is susceptible to cracking owing to its brittle nature, which seriously threatens the security and reliability of the weapons system. In this work, a novel strengthening method making use of a carbon fibre reinforced polymer (CFRP) patch was adopted to enhance the mechanical performance of the PBX. Brazilian compression tests were conducted on the unreinforced, locally reinforced, and fully reinforced PBX discs to elucidate the strengthening mechanism of the patch. Digital image correlation was employed to characterise the deformation and failure processes of the discs during the full testing period. The results showed that failure of the PBX was caused by initiation and extension of the deformation that localises within the regions near the loading positions. The CFRP patches provided the benefits of load transfer and deformation confinement, which alleviated stress concentration in the disc. Consequently, collapse of the patched discs was delayed, and the load‐carrying ability was improved. The findings of this study may deepen our understanding of PBX failure behaviours, and further the performance optimisation of weapons systems.

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“…[12][13][14][15][16][17][18][19][20][21][22][23][24]. The main conclusions of such research were: (i) the strain rate and temperature response are generally governed by the properties of the polymer binder [15,16]; (ii) the absolute value of the stress supported for a given strain rate and temperature is governed by the size of the explosive crystals [12,14].…”

Section: Introductionmentioning

confidence: 99%

Temperature and strain rate effects on the mechanical properties of a polymer-bonded explosive

Walley

Taylor

Williamson

2018

Eur. Phys. J. Spec. Top.

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Abstract. The aim of the research reported here was to investigate the strain rate and temperature sensitivity of Rowanex 1100 Type 1A, a polymer-bonded explosive (PBX). The stress supported by this PBX at high rates of deformation (1750 ± 225 s −1 ) was found to be about an order of magnitude greater than that supported at low rates (0.015 s −1 ). Temperature was also found to have a large effect, with the strength of the material decreasing exponentially with temperature over the range studied (-60 to +60• C). The exponents for the decay of the PBX's strength with temperature at both low and high strain rates were the same within experimental error. So a temperature/strain rate shift factor could be determined and was found to be 31.2 ± 2.4 K/decade of strain rate.

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

Cited by 11 publications

References 31 publications

Review of SHPB Dynamic Load Impact Test Characteristics and Energy Analysis Methods

Review of SHPB Dynamic Load Impact Test Characteristics and Energy Analysis Methods

Digital Image Correlation Measurement of the Deformation and Failure in PBX Brazilian Discs Reinforced with CFRP Patches

Temperature and strain rate effects on the mechanical properties of a polymer-bonded explosive

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