Internal Deformation Measurement of Polymer Bonded Sugar in Compression by Digital Volume Correlation of In-situ Tomography

Hu, Zengyun; Luo, Huiyang; Bardenhagen, S.G.; Siviour, Clive R.; Armstrong, Ronald W.; Lu, Hongbing

doi:10.1007/s11340-014-9856-4

Cited by 47 publications

(22 citation statements)

References 40 publications

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“…6a (red arrow on C6). Fracture of crystals during material preparation is common [29]. This initial crack starts to grow as loading progress and leads to fracture C6.…”

Section: Crystal Fracturementioning

confidence: 99%

Local Deformation and Failure Mechanisms of Polymer Bonded Energetic Materials Subjected to High Strain Rate Loading

Ravindran

Tessema

Kidane

2016

J. dynamic behavior mater.

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The dynamic multi-scale deformation mechanism of polymer bonded energetic material is investigated. Samples made of polymer bonded sugar (a known simulate for polymer bonded explosives) with 85 % sugar crystals and 15 % polymer binder are used. The samples are dynamically compressed using a split Hopkinson pressure bar. Using a high magnification, meso-scale 2D digital image correlation experimental setup, the local deformation is measured in situ at sub-grain scale. The macroscale deformation mechanism is also investigated with the help of 3D digital image correlation. From the mesoscale experiment, it is observed that the local strain distribution in the specimen is highly heterogeneous with large strain localization occurring at the polymer rich areas between the crystal boundaries. Deformations of the majority of the crystals are minimal, and usually realign themselves to accommodate large deformation of the binder by rigid rotation and sliding. Due to this, delamination of the polymer binder from crystals and binder cracking are the main local failure modes. It is also observed that the presence of small crushed crystals from material processing are the favorable sites for this opening mode failure.

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“…6a (red arrow on C6). Fracture of crystals during material preparation is common [29]. This initial crack starts to grow as loading progress and leads to fracture C6.…”

Section: Crystal Fracturementioning

confidence: 99%

Local Deformation and Failure Mechanisms of Polymer Bonded Energetic Materials Subjected to High Strain Rate Loading

Ravindran

Tessema

Kidane

2016

J. dynamic behavior mater.

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“…The analysis of multiple debond cracks was shown to be possible in a tensile test on a propellant-like material thanks to global DVC by using the correlation residuals [95]. The same mechanism was found in polymer bonded sugar in uniaxial compression [104]. The gray level residuals were also used to detect matrix/nodule debonding in cast iron [93,219,29].…”

Section: Introductionmentioning

confidence: 99%

Digital Volume Correlation: Review of Progress and Challenges

et al. 2018

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3D imaging has become popular for analyzing material microstructures. When time lapse series of 3D pictures are acquired during a single experiment, it is possible to measure displacement fields via digital volume correlation (DVC), thereby leading to 4D results. Such ForewordThe present paper aims at reviewing the major developments in Digital Volume Correlation (DVC) over the past ten years. It follows the first review on DVC that was published in 2008 by its pioneer [11]. In the latter, the interested reader will find all the general principles associated with what is now called local DVC. They will not be recalled hereafter. In such approaches the region of interest is subdivided into small subvolumes that are independently registered. In addition to its wider use with local approaches, DVC has been extended to global approaches in which the displacement field is defined in a dense way over the region of interest. Kinematic bases using finite element discretizations have been selected. To further add mechanical content, elastic regularization has been introduced. Last, integrated approaches use kinematic fields that are constructed from finite element simulations with chosen constitutive equations. The material parameters (and/or boundary conditions) then become the quantities of interest.These various implementations assume different degrees of integration of mechanical knowledge about the analyzed experiment. First and foremost, DVC can be considered as a stand-alone technique, which has seen its field of applications grow over the last ten years. In this case the measured displacement fields and post-processed strain fields are reported. With the introduction of finite element based DVC, the measured displacement field is continuous. It is also a standalone technique. However, given the fact that it shares common kinematic bases with numerical simulations, it can be easily combined with the latter. One route is to require local satisfaction of equilibrium via mechanical regularization. Another route is to fully merge DVC analyses and numerical simulations via integrated approaches. Different examples will illustrate how these various integration steps can be tailored and what are the current challenges associated with various approaches.

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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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Internal Deformation Measurement of Polymer Bonded Sugar in Compression by Digital Volume Correlation of In-situ Tomography

Cited by 47 publications

References 40 publications

Local Deformation and Failure Mechanisms of Polymer Bonded Energetic Materials Subjected to High Strain Rate Loading

Local Deformation and Failure Mechanisms of Polymer Bonded Energetic Materials Subjected to High Strain Rate Loading

Digital Volume Correlation: Review of Progress and Challenges

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

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