Large-area sapphire windows

Gentilman, Richard L.; McGuire, Patrick Timothy; Fiore, Daniel; Ostreicher, Kim; Askinazi, Joel

doi:10.1117/12.501435

Cited by 14 publications

(2 citation statements)

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“…The United States has made great progress in sapphire connection technology, sapphire has been applied to F-35 and F-22 fighters, Cockpit of AH-64 Apache helicopter also uses sapphire composite transparent technology. Therefore, as a new type of bulletproof transparent material, sapphire gradually shows prominent application advantage and development prospects in many fields [4,5].…”

Section: Introductionmentioning

confidence: 99%

Damage and failure mechanism of bullets impact sapphire based on LS-DYNA

Liu¹,

Qu²,

Lv³

et al. 2018

Proceedings of the 4th Annual International Conference on Material Engineering and Application (ICMEA 2017)

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Based on the Johnson-Holmquist-Ceramics material model in LS-DYNA, the penetration process of the bullet impact sapphire plate is simulated by finite element method, and the penetration failure mechanism is also analyzed. Four main observations are obtained-First, when the bullet hits the sapphire plate, the warhead does not invade the panel immediately, but is firstly roughened and abraded. Secondly, the force on the warhead increased sharply and reached the peak value in the process of the formation of the sapphire smash cone. Thirdly, after the smash cone is completely formed, the plate strength decreases gradually and the force of the projectile appears fluctuating or decreasing. Finally, in the whole penetration process, the fragmentation and cracking of sapphire mainly serve to absorb most of the kinetic energy of the bullets and to reduce the bullet speed. This study provides a reference for the design of bulletproof composite armor.

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Section: Introductionmentioning

confidence: 99%

Damage and failure mechanism of bullets impact sapphire based on LS-DYNA

Liu¹,

Qu²,

Lv³

et al. 2018

Proceedings of the 4th Annual International Conference on Material Engineering and Application (ICMEA 2017)

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“…Single‐crystal Al 2 O 3 (sapphire) is widely used for mid‐IR transmission applications . However, the high cost of fabrication and its poor performance at high temperatures has initiated a search for suitable alternatives. Nanocrystalline Y 2 O 3 and Y 2 O 3 ‐base nanocomposites are attractive candidates, as they exhibit excellent transmittance in the mid‐to‐near infrared (2–8 μm) range .…”

Section: Introductionmentioning

confidence: 99%

Surface Modification in Polycrystalline Y₂O₃ Under High‐Pressure/High‐Temperature Processing Conditions

et al. 2013

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A pressure-induced phase transformation is used to refine the grain size of polycrystalline Y 2 O 3 , by a factor of 3000. A surface modification effect accompanies the observed grain refinement, which becomes more apparent with increasing holding time under high pressure. The surface-modified layer exhibits lower hardness and lower oxygen content relative to the underlying material. Moreover, it possesses columnar-grained structure with cubic symmetry, whereas the interior has a monoclinic structure.I. Reimanis-contributing editor Manuscript No. 31715.

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Synchrotron X‐ray diffraction studies of large sapphire crystal grown by Kyropoulos‐like method

Wang

Zhang

Wu³

et al. 2010

Physica Status Solidi (a)

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In this paper, monochromatic double‐crystal X‐ray diffraction and white‐beam X‐ray topography techniques using synchrotron radiation source were utilized to investigate the growth process of large sapphire crystal by an improved Kyropoulos‐like method. Compared with the calculated theoretical value of 8.6 s, FWHM experimental values of sapphire are in the range of 11 ∼ 26 s, showing its good crystalline perfection in general, especially for the crystal in the central region of the boule. The analysis of white beam transmission X‐ray topographs revealed the presence of dislocation tangles and helical dislocations in different crystal regions. The defect configurations in sapphire crystals were caused by the dislocation reaction and void formation.

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Large-area sapphire windows

Cited by 14 publications

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Damage and failure mechanism of bullets impact sapphire based on LS-DYNA

Damage and failure mechanism of bullets impact sapphire based on LS-DYNA

Surface Modification in Polycrystalline Y₂O₃ Under High‐Pressure/High‐Temperature Processing Conditions

Synchrotron X‐ray diffraction studies of large sapphire crystal grown by Kyropoulos‐like method

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Large-area sapphire windows

Cited by 14 publications

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Damage and failure mechanism of bullets impact sapphire based on LS-DYNA

Damage and failure mechanism of bullets impact sapphire based on LS-DYNA

Surface Modification in Polycrystalline Y2O3 Under High‐Pressure/High‐Temperature Processing Conditions

Synchrotron X‐ray diffraction studies of large sapphire crystal grown by Kyropoulos‐like method

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Surface Modification in Polycrystalline Y₂O₃ Under High‐Pressure/High‐Temperature Processing Conditions