Static and dynamic compression strength of hot-pressed boron carbide using a dumbbell-shaped specimen

Swab, Jeffrey J.; Meredith, Christopher S.; Casem, Daniel; Gamble, William

doi:10.1007/s10853-017-1210-7

Cited by 34 publications

(22 citation statements)

References 29 publications

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“…This is very different than what is observed for concrete, glass, and rock 3,7 that show a strong dependence on hydrostatic pressure when on the tensile meridian (the strength increases as the hydrostatic pressure increases, typically on the order of

\overset{false~}{σ} / P = 1.0 ‐ 1.5

). This is also different than what is observed for boron carbide when on the compressive meridian where the strength increases dramatically going from

\overset{false~}{σ} = 6.1 GPa

at P = 2.0 GPa 15 to

\overset{false~}{σ} = 12.3 GPa

at P = 8.0 GPa 17 (although the pressures are much higher than those presented in Figure 6). There also appears to be no noticeable strain rate effect as the plate impact spall experiments are at

\dot{ε} = 10^{5} s^{‐ 1}

and the other data are quasi‐static

\dot{ε} = 10^{‐ 4} s^{‐ 1}

(this lack of strain rate effect has also been observed in compression, for this same material 15,26 ).…”

Section: Discussioncontrasting

confidence: 80%

The effect of the third invariant on the strength and failure of boron carbide and silicon carbide

2021

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This article presents new test data to assess the effect the third invariant has on the strength and failure of two ceramic materials: boron carbide and silicon carbide. Two experimental techniques are used: the Brazilian test that produces a biaxial state of stress, and a new technique that uses a high‐pressure confinement vessel to load a specially designed dumbbell specimen in triaxial extension. The dumbbell geometry provides two important advantages over the typically used cylindrical specimen: no adhesive is required to bond the specimen to the load cell because the dumbbell geometry naturally takes the specimen into tension, and any loading asymmetries are essentially eliminated due to the axisymmetric geometry. The results show that when the stress state is on the tensile meridian the equivalent stress at failure is constant, independent of the hydrostatic pressure. The average equivalent stress at failure is σfalse~=272MPa for boron carbide and σfalse~=475MPa for silicon carbide. The Brazilian test was only performed on boron carbide and failed at σfalse~∼900MPa, much higher than when on the tensile meridian (σfalse~=272MPa) indicating that the effect of the third invariant is significant (because of the difference in the failure strength) and must be accounted for to accurately predict when failure will occur.

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\overset{false~}{σ} / P = 1.0 ‐ 1.5

). This is also different than what is observed for boron carbide when on the compressive meridian where the strength increases dramatically going from

\overset{false~}{σ} = 6.1 GPa

at P = 2.0 GPa 15 to

\overset{false~}{σ} = 12.3 GPa

at P = 8.0 GPa 17 (although the pressures are much higher than those presented in Figure 6). There also appears to be no noticeable strain rate effect as the plate impact spall experiments are at

\dot{ε} = 10^{5} s^{‐ 1}

and the other data are quasi‐static

\dot{ε} = 10^{‐ 4} s^{‐ 1}

(this lack of strain rate effect has also been observed in compression, for this same material 15,26 ).…”

Section: Discussioncontrasting

confidence: 80%

The effect of the third invariant on the strength and failure of boron carbide and silicon carbide

2021

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“…Traditionally, the high strain rate properties of ceramic materials are analysed in compression using the split Hopkinson pressure bar (SHPB) technique [2][3][4]. The SHPB method uses a small sample sandwiched between two long bars which act as load cells.…”

Section: Introductionmentioning

confidence: 99%

An Image-Based Inertial Impact (IBII) Test for Tungsten Carbide Cermets

Fletcher

Pierron

2018

J. dynamic behavior mater.

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Testing tungsten carbide cermets at high strain rates is difficult due to their high stiffness and brittle failure mode. Therefore, the aim of this study is to apply the image-based inertial impact (IBII) test methodology to analyse the high strain rate properties of tungsten carbide cermets. The IBII test uses an edge on impact test configuration with a narrow stress pulse. The narrow input pulse travels through the specimen in compression and reflects in tension causing failure. Full-field measurements of acceleration and strain are then coupled with the virtual fields method to identify the stiffness components and tensile strength of a test sample at high strain rates. Image deformation simulations were used to select optimal test processing parameters and predict the associated experimental errors. The elastic modulus and tensile strength of the tested tungsten carbide cermet samples were successfully identified using the IBII test at strain rates on the order of 1000 s −1. No significant strain rate dependence was detected for either the stiffness or tensile strength.

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“…Generally the size distribution is sufficient if the isotropic damage tensor is used, as in the simulations in this paper. Size and orientation distributions, typically obtained through detail microCT characterization, can be input directly into the model; if such distributions are not available, the distributions can be calibrated by matching the rate-dependent strength under uniaxial stress loading (a dumbbell test [104] would be ideal, but such data is often not available). One input parameter that must often be fit is the friction coefficient associated with sliding in the plane of the defect -in the case of boron carbide, this can be estimated from the properties of graphite.…”

Section: Calibration Of the Modelmentioning

confidence: 99%

Models for the behavior of boron carbide in extreme dynamic environments

et al. 2021

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We describe models for the behavior of hot-pressed boron carbide that is subjected to extreme dynamic environments such as ballistic impact. We first identify the deformation and failure mechanisms that are observed in boron carbide under such conditions, and then review physics-based models for each of these mechanisms and the integration of these models into a single physics-based continuum model for the material. Atomistic modeling relates the composition and stoichiometry to the amorphization threshold, while mesoscale

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Static and dynamic compression strength of hot-pressed boron carbide using a dumbbell-shaped specimen

Cited by 34 publications

References 29 publications

The effect of the third invariant on the strength and failure of boron carbide and silicon carbide

The effect of the third invariant on the strength and failure of boron carbide and silicon carbide

An Image-Based Inertial Impact (IBII) Test for Tungsten Carbide Cermets

Models for the behavior of boron carbide in extreme dynamic environments

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