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Design and Fabrication of an Hyper- Hemispherical ALON TM Dome for Counter MANPADS Applications May 04, 2006 Electromagnetic Windows Symposium Objective,

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Presentation on theme: "Design and Fabrication of an Hyper- Hemispherical ALON TM Dome for Counter MANPADS Applications May 04, 2006 Electromagnetic Windows Symposium Objective,"— Presentation transcript:

1 Design and Fabrication of an Hyper- Hemispherical ALON TM Dome for Counter MANPADS Applications May 04, 2006 Electromagnetic Windows Symposium Objective, Dome Material/Fabrication: Mid-wave material Extreme environmental durability Technology available to ‘form’ into a monolithic hyper-hemispherical configuration Accurate and repeatable High-speed optical fabrication process Cost effective combination of materials and processing

2 Design and Fabrication of an Hyper- Hemispherical ALON TM Dome for Counter MANPADS Applications May 04, 2006 Electromagnetic Windows Symposium Material Option(s) review: Spinel. Silicon ALON

3 Design and Fabrication of an Hyper- Hemispherical ALON TM Dome for Counter MANPADS Applications May 04, 2006 Electromagnetic Windows Symposium Foreign Object Damage, testing: Testing on ALON, Silicon and Fused Silica. Being performed at UDRI Simulate aircraft foreign object damage from take-off/landing (20 m/s to 75 m/s) Testing being conducted by launching 3/8” diameter granite projectiles into the window samples using a.50 caliber bore compressed-gas gun. Parts rigidly mounted at 45 0 AOI A laser photodetector system has been employed to measure the projectile impact velocity All parts are being photographed before and after test

4 Design and Fabrication of an Hyper- Hemispherical ALON TM Dome for Counter MANPADS Applications May 04, 2006 Electromagnetic Windows Symposium Foreign Object Damage, testing:

5 Design and Fabrication of an Hyper- Hemispherical ALON TM Dome for Counter MANPADS Applications May 04, 2006 Electromagnetic Windows Symposium Strength of Material, Improvement, ALON The objective of the ALON strength enhancement program were to increase the strength of ALON so that high thermal shock resistant domes could be made. Several years of fabrication/thermal processing development yielded a significant increase to the ultimate strength of ALON

6 Design and Fabrication of an Hyper- Hemispherical ALON TM Dome for Counter MANPADS Applications May 04, 2006 Electromagnetic Windows Symposium Strength of Material, Improvement, ALON Successful Thermal Shock-testing of Domes + much higher ultimate strength exhibited by equi-biaxial flexure testing of plano samples validates the modified material process’

7 Design and Fabrication of an Hyper- Hemispherical ALON TM Dome for Counter MANPADS Applications May 04, 2006 Electromagnetic Windows Symposium ‘Forming’, ALON

8 Design and Fabrication of an Hyper- Hemispherical ALON TM Dome for Counter MANPADS Applications May 04, 2006 Electromagnetic Windows Symposium ‘Green’ Machining, ALON

9 Design and Fabrication of an Hyper- Hemispherical ALON TM Dome for Counter MANPADS Applications May 04, 2006 Electromagnetic Windows Symposium ‘High-Speed’ Optical Fabrication, ALON

10 Design and Fabrication of an Hyper- Hemispherical ALON TM Dome for Counter MANPADS Applications May 04, 2006 Electromagnetic Windows Symposium

11 Design and Fabrication of an Hyper- Hemispherical ALON TM Dome for Counter MANPADS Applications May 04, 2006 Electromagnetic Windows Symposium

12 Design and Fabrication of an Hyper- Hemispherical ALON TM Dome for Counter MANPADS Applications May 04, 2006 Electromagnetic Windows Symposium

13 Design and Fabrication of an Hyper- Hemispherical ALON TM Dome for Counter MANPADS Applications May 04, 2006 Electromagnetic Windows Symposium Thin-film Coatings

14 Design and Fabrication of an Hyper- Hemispherical ALON TM Dome for Counter MANPADS Applications May 04, 2006 Electromagnetic Windows Symposium Thin-Film

15 Design and Fabrication of an Hyper- Hemispherical ALON TM Dome for Counter MANPADS Applications May 04, 2006 Electromagnetic Windows Symposium


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