Shock deformation of sapphire single crystals

Wang, Y.; Mikkola, D.E.

doi:10.1016/0921-5093(91)90862-h

Cited by 15 publications

(5 citation statements)

References 7 publications

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“…For the past few decades the deformation mechanisms and the deformed microstructures of sapphire (a-A1203 single crystals) have been studied under a diverse range of conditions that include high-temperature creep (for example, Mitchell et al (1976) and Lagerlof et al (1983)), hydrostatic compression (Castaing and Cadoz 1981, Cadoz et al 1984, indentation (Hockey 1971, Hockey andLawn 1975), and shock wave deformation (Wang andMikkola 1991, Chen 1994). Deformed microstructures ranging from the dislocation-dominated to the twin-dominated have been reported from transmission electron microscopy (TEM) investigations.…”

mentioning

confidence: 99%

Observations of partial dislocations and basal twin boundaries in shock-wave-deformed sapphire

Chen

Howitt

1998

Philosophical Magazine A

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mentioning

confidence: 99%

Observations of partial dislocations and basal twin boundaries in shock-wave-deformed sapphire

Chen

Howitt

1998

Philosophical Magazine A

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“…Bookmark not defined.10> and 1/3<11Error! Bookmark not defined.20> and glide along basal slip planes, some may have also been non-basal dislocations [31]. At locations deeper into the subsurface of both the nZTA and alumina fragments, the dislocation density was found to gradually decrease, with no dislocations detected beyond a depth of ~1 µm.…”

Section: Sem and Tem Observations Of Nzta Fragmentsmentioning

confidence: 98%

The ballistic impact performance of nanocrystalline zirconia-toughened alumina (nZTA) and alumina ceramics

Wade-Zhu

et al. 2021

Journal of the European Ceramic Society

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The ballistic impact performance of nanocrystalline zirconia-toughened alumina (nZTA) ceramics, comprising 15 wt% nano-yttria-stabilised zirconia in a sub-micron alumina matrix, have been studied through depth of penetration tests and compared to the results for monolithic alumina. The penetration resistance of each material was evaluated by fitting the penetration depth results against the thickness of the ceramic targets. These results show that, despite micro-Raman analysis of the nZTA confirming the occurrence of the classic tetragonal-to-monoclinic zirconia phase transformation, nZTA ceramics provide no benefit with respects to penetration resistance compared to monolithic alumina. Analysis of the fragments generated using Cr 3+ /Al 2 O 3 fluorescence spectroscopy shows that both the nZTA and alumina experience similar amounts of plastic deformation as a function of fragment size, with finer fragments (<150 µm) exhibiting more plastic deformation than coarser fragments (>150 µm). These results are validated through fracture surface observations and subsurface dislocation analysis using SEM and TEM respectively.

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“…It was thought that the weakest orientation leads to the strength of the material among polycrystals with the random orientation distribution. Wang 17 performed experiments for the crystal structure deformation of three different planes and then used transmission electron microscopy to examine sample slices. The impact perpendicular to the r ‐plane resulted in the highest volume fraction twins, while the impact perpendicular to the c ‐plane produced the lowest value.…”

Section: Introductionmentioning

confidence: 99%

Damage and failure mechanism of sapphire under ballistic loading based on a modified bond‐based peridynamic model

et al. 2022

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To investigate the dynamic mechanical behaviors of 𝑐-plane and 𝑎-plane sapphire, a novel anisotropic constitutive model and fracture criterion are constructed on the basis of bond-based peridynamics (BB-PD) theory. And the concept of strain is introduced in the framework of BB-PD. After that, the simulations of 𝑎-and 𝑐-planes of sapphire under spherical and cylindrical impact are conducted. In addition to capturing the distribution of strain and damage, the histories of various fracture types such as the primary fracture front and cracks are monitored for quantitative analysis. The numerical predictions are shown to agree well with previous experimental results, and further reveal the damage and failure mechanisms of sapphire. The different forms of contact between the projectile and the target strongly influence the stress waves generated and energy transferred ultimately affecting the damage development process. The crystal orientation dominates the appearance of anisotropic crack modes. Crack bending and deflection, as well as spalling-like fracture, are associated with wave reflection and intersection. Moreover, an in-depth examination of the observed wave splitting phenomenon is performed.

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Shock deformation of sapphire single crystals

Cited by 15 publications

References 7 publications

Observations of partial dislocations and basal twin boundaries in shock-wave-deformed sapphire

Observations of partial dislocations and basal twin boundaries in shock-wave-deformed sapphire

The ballistic impact performance of nanocrystalline zirconia-toughened alumina (nZTA) and alumina ceramics

Damage and failure mechanism of sapphire under ballistic loading based on a modified bond‐based peridynamic model

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