Plastic deformation of polycrystalline alumina introduced by scaled-down drop-weight impacts

Wade, James B.; Robertson, Stuart; Zhu, Ying; Wu, Houzheng

doi:10.1016/j.matlet.2016.04.023

Cited by 5 publications

(4 citation statements)

References 20 publications

(28 reference statements)

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“…The brittle behavior of materials under tensile loading is attributed to macro-crack formation. On the other hand, the ductile behavior of ceramics under compression can be explained by micro-crack formation and plasticity [ 26 , 27 , 28 ].…”

Section: Thermo-mechanical Coupling Modelmentioning

confidence: 99%

Thermo-Mechanical Coupling Model of Bond-Based Peridynamics for Quasi-Brittle Materials

et al. 2022

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The mechanical properties of quasi-brittle materials, which are widely used in engineering applications, are often affected by the thermal condition of their service environment. Moreover, the materials appear brittle when subjected to tensile loading and show plastic characteristics under high pressure. These two phenomena manifest under different circumstances as completely different mechanical behaviors in the material. To accurately describe the mechanical response, the material behavior, and the failure mechanism of quasi-brittle materials with the thermo-mechanical coupling effect, the influence of the thermal condition is considered in calculating bond forces in the stretching and compression stages, based on a new bond-based Peridynamic (BB-PD) model. In this study, a novel bond-based Peridynamic, fully coupled, thermo-mechanical model is proposed for quasi-brittle materials, with a heat conduction component to account for the effect of the thermo-mechanical coupling. Numerical simulations are carried out to demonstrate the validity and capability of the proposed model. The results reveal that agreement could be found between our model and the experimental data, which show good reliability and promise in the proposed approach.

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Section: Thermo-mechanical Coupling Modelmentioning

confidence: 99%

Thermo-Mechanical Coupling Model of Bond-Based Peridynamics for Quasi-Brittle Materials

et al. 2022

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“…For additional literature related to the supporting information, see Alderbert & Traverse (1984), d'Amour et al (1978, Anderson & Isaak (1995), Beauchamp et al (1985), , Chen et al (2006), Choi & Auh (1995a), Dancer et al (2011), Goto et al (1989), Hazen (1976), Kudoh & Takeuchi (1985), Merala et al (1988), Mukhopadhyay et al (2012), Ross & Navrotsky (1987), Wade et al (2016), Wang & Mikkola (1992), Warshaw & Norton (1962), Watson et al (2002) and Weidner & Hamaya (1983).…”

Section: Related Literaturementioning

confidence: 99%

ECCI, EBSD and EPSC characterization of rhombohedral twinning in polycrystalline α-alumina deformed in a D-DIA apparatus

Kaboli

Burnley

2017

J Appl Cryst

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Rhombohedral twinning in alumina (aluminium oxide, α‐Al2O3) is an important mechanism for plastic deformation under high‐temperature–pressure conditions. Rhombohedral twins in a polycrystalline alumina sample deformed in a D‐DIA apparatus at 965 K and 4.48 GPa have been characterized. Three classes of grains were imaged, containing single, double and mosaic twins, using electron channeling contrast imaging (ECCI) in a field emission scanning electron microscope. These twinned grains were analyzed using electron backscatter diffraction (EBSD). The methodology for twin identification presented here is based on comparison of theoretical pole figures for a rhombohedral twin with experimental pole figures obtained with EBSD crystal orientation mapping. An 85°⟨021⟩ angle–axis pair of misorientation was identified for rhombohedral twin boundaries in alumina, which can be readily used in EBSD post‐processing software to identify the twin boundaries in EBSD maps and distinguish the rhombohedral twins from basal twins. Elastic plastic self‐consistent (EPSC) modeling was then used to model the synchrotron X‐ray diffraction data from the D‐DIA experiments utilizing the rhombohedral twinning law. From these EPSC models, a critical resolved shear stress of 0.25 GPa was obtained for rhombohedral twinning under the above experimental conditions, which is internally consistent with the value estimated from the applied load and Schmid factors determined by EBSD analysis.

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“…While the ductile behaviour of the ceramics under compression can be explained by micro-crack formation and plasticity. Plastic deformation of ceramics under impact is well known and appears for sufficiently high confining pressures [4,5,6,7,8].…”

Section: Introductionmentioning

confidence: 99%

“…There are two main paths one can take to better understand the failure process. The first way is to limit the loading rates, and therefore consider quasi-static indentation tests [9,10] and slow dynamic testing such as drop-weight impact tests [7]. The main advantage of these tests is that the ceramic does not fail catastrophically.…”

Section: Introductionmentioning

confidence: 99%

Simulating brittle and ductile response of alumina ceramics under dynamic loading

Simons

Weerheijm

Sluys

2019

Engineering Fracture Mechanics

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Alumina ceramic is often used in armour systems. This material is known to have a brittle response under tensile loading, while a ductile response is found when sufficiently high pressures are reached. During projectile impact a ceramic material experiences both tensile loading and high pressures, hence fails in both a brittle and ductile way. Properly capturing the ceramic failure in a single material model remains challenging. A viscosity regularized Johnson-Holmquist-2 model has been used to simulate dynamic loading on alumina ceramic. The simulations show that the brittle and ductile nature of the material can not be captured simultaneously in the current material model. A new failure strain formulation is proposed where the behaviour under tensile and compressive loading can be controlled independently. This allows to properly capture both the brittle and ductile response of the material in a single constitutive framework, with a single set of model parameters.

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Plastic deformation of polycrystalline alumina introduced by scaled-down drop-weight impacts

Cited by 5 publications

References 20 publications

Thermo-Mechanical Coupling Model of Bond-Based Peridynamics for Quasi-Brittle Materials

Thermo-Mechanical Coupling Model of Bond-Based Peridynamics for Quasi-Brittle Materials

ECCI, EBSD and EPSC characterization of rhombohedral twinning in polycrystalline α-alumina deformed in a D-DIA apparatus

Simulating brittle and ductile response of alumina ceramics under dynamic loading

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