Effect of interface chemistry and strain rate on particle-matrix delamination in an energetic material

Prakash, Chandra; Gunduz, I. Emre; Oskay, Caglar; Tomar, Vikas

doi:10.1016/j.engfracmech.2018.01.010

Cited by 45 publications

(41 citation statements)

References 79 publications

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“…This section covers brief explanation of the experimental methods and theories to be used in this work. These methods have been covered in detail in previous works [18][19][20][21].…”

Section: Methodsmentioning

confidence: 99%

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Experimental study of anisotropic constitutive behavior of β-HMX crystals via nanoindentation and small-scale dynamic impact

et al. 2021

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For energetic crystals such as HMX, the sensitivity of the material to shock, the possibility of initiation, and the subsequent reaction is known to be controlled by processes occurring at the crystal level. The anisotropic nature of β-HMX can be critical in determining the performance of HMX based polymer bonded explosives, which are widely used across multiple industries as propellant or explosives. In this work, we experimentally obtain constitutive parameters for characterizing the response of multiple crystalline planes of β-HMX crystals to external loading. Nanoindentation and small-scale dynamic impact experiments were performed on multiple planes of β-HMX crystals to comparatively measure the indentation moduli in multiple orientation directions. Anisotropic material behavior, involving constitutive elastic and non-elastic parameters, was measured and studied. Findings regarding material properties for the (100), (010), (001), {110}, and {011} planes of β-HMX are presented and compared with literature data.

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“…This section covers brief explanation of the experimental methods and theories to be used in this work. These methods have been covered in detail in previous works [18][19][20][21].…”

Section: Methodsmentioning

confidence: 99%

“…The schematic for the equipment setup is shown in Fig. 5 , [19], below. Depth is measured by the distance between the capacitors located behind the impactor and the velocity is obtained by a continuous differentiation of the depthtime plot.…”

Section: Dynamic Small-scale Impact Experimentsmentioning

confidence: 99%

Experimental study of anisotropic constitutive behavior of β-HMX crystals via nanoindentation and small-scale dynamic impact

et al. 2021

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“…Computational and numerical methods have been widely used to study the contribution of individual and combined mechanisms responsible for heat generation in heterogeneous materials. In the case of energetic materials, computational methods have provided an improved understanding of temperature rise due to void collapse 12 , 18 , 20 , shear deformation 22 , 23 , interface failure 24 – 27 , and friction 11 , 14 , 24 . However, the computational methods still require calibration and validation using experiments.…”

Section: Introductionmentioning

confidence: 99%

Thermo-mechanical behavior measurement of polymer-bonded sugar under shock compression using in-situ time-resolved Raman spectroscopy

Dhiman

Lewis

Olokun

et al. 2022

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Quantitative information regarding the local behavior of interfaces in an inhomogeneous material during shock loading is limited due to challenges associated with time and spatial resolution. This paper reports the development of a novel method for in-situ measurement of the thermo-mechanical response of polymer bonded sugar composite where measurements are performed during propagagtion of shock wave in sucrose crystal through polydimethylsiloxane binder. The time-resolved measurements were performed with 5 ns resolution providing an estimation on local pressure, temperature, strain rate, and local shock viscosity. The experiments were performed at two different impact velocities to induce shock pressure of 4.26 GPa and 2.22 GPa and strain rate greater than 106/s. The results show the solid to the liquid phase transition of sucrose under shock compression. The results are discussed with the help of fractography analyses of sucrose crystal in order to obtain insights into the underlying heat generation mechanism.

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“…Furthermore, the strain-rate sensitivity seems to be slightly more pronounced in shear than in tension and compression modes [14]. However, the understanding of variation in deformation mechanism of particulate composites at different strain rates is still not investigated theoretically; therefore, there is no mathematical model for the prediction of material properties with variation in strain rate [15][16][17].The TiO 2 is extensively used in the industry as additives in plastics, agglomerates for thermal sprays, air/fuel ratio controller in automobile, attenuation of ultraviolet light, catalysts and catalyst supports, demilitarization of chemical and biological warfare agents, electrode materials in lithium batteries, energy converter in solar cells, gas sensors, inorganic membranes, photo catalytic degradation of bacteria and grime, photochemical degradation of toxic chemicals, piezoelectric capacitors, solid oxide fuel cell, UV protection, and waste water purification [18][19][20][21][22][23][24][25].In the present study, epoxy resin reinforced with micro TiO 2 and nano TiO 2 were manufactured in order to investigate the effect of the size of the reinforcing particles on the mechanical and viscoelastic properties of the resulted composite materials. Applied titanium dioxide particles had two different diameters; namely: 200 nm for the microcomposites and 21 nm for the nanocomposites.…”

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confidence: 99%

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Experimental and Prediction Study of Displacement-Rate Effects on Flexural Behaviour in Nano and Micro TiO2 Particles-Epoxy Resin Composites

2019

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Epoxy resin composites with different weight fractions of TiO 2 microparticles (1%, 5%, 10%, 15%, 20%) and of TiO 2 nanoparticles (0.5%, 1%, 2%, 3%) were prepared. The particle size of the nanoparticles was averaged around 21 nm while the particle size of the micro TiO 2 particles was averaged around 0.2 µm. The morphology of the manufactured particulate composites was studied by means of scanning electron microscopy (SEM). The mechanical properties of both nanocomposites (21 nm) and microcomposites (0.2 µm) were investigated and compared through flexural testing. Furthermore, the effect of displacement-rate on the viscoelastic behavior of composite materials was investigated. The flexural tests were carried out at different filler weight fractions and different displacement-rates (0.5, 5, 10, 50 mm/min). The influence of TiO 2 micro-and nanoparticles on the mechanical response of the manufactured composites was studied. For micro TiO 2 composites, a maximum increase in flexural modulus on the order of 23% was achieved, while, in the nanocomposites, plastification of the epoxy matrix due to the presence of TiO 2 nanoparticles was observed. Both behaviors were predicted by the Property Prediction Model (PPM), and a fair agreement between experimental results and theoretical predictions was observed.Polymers 2020, 12, 22 2 of 13 in improving the mechanical properties of the composite. The lower the filler diameter, the higher the filler surface/contact area is. Thus, in case of micron sized particles, the size of the low-density interfacial region of the pure polymer surrounding the inclusion is higher, so that the contribution of the filler is reduced, concluding that the mechanical properties of the composite will not be improved that much [6]. On the contrary, the nanoparticles can fill up the weak regions within the epoxy resin, and thus increasing the filler-matrix interaction force. The increase of the extent interfacial region can significantly improve the mechanical properties of the epoxy/nanocomposite. However, the nanoparticles have a difficulty to disperse into the matrix, so it is crucial to find the proper manufacturing technique to improve particle dispersion within the matrix material. A technique that is commonly applied is the ultrasonic homogenization; however, as every technique has its disadvantages. More precisely, this technique decreases the gelling time of the epoxy resin [7][8][9][10][11].The mechanical response of particulate reinforced composites also depends on the rate of deformation. It was found that particulates increase the strain rate sensitivity concerning tensile modulus, but this sensitivity decreases when measuring yield strength [12]. The effect of strain rate on the flexural properties of some polymer matrix composites has been studied and, as it was found, the flexural modulus and flexural strength both increase linearly with the logarithm of the strain rate [13]. Furthermore, the strain-rate sensitivity seems to be slightly more pronounced in shear than in tension and comp...

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Effect of interface chemistry and strain rate on particle-matrix delamination in an energetic material

Cited by 45 publications

References 79 publications

Experimental study of anisotropic constitutive behavior of β-HMX crystals via nanoindentation and small-scale dynamic impact

Experimental study of anisotropic constitutive behavior of β-HMX crystals via nanoindentation and small-scale dynamic impact

Thermo-mechanical behavior measurement of polymer-bonded sugar under shock compression using in-situ time-resolved Raman spectroscopy

Experimental and Prediction Study of Displacement-Rate Effects on Flexural Behaviour in Nano and Micro TiO2 Particles-Epoxy Resin Composites

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