Photodegradation in ballistic laminates: Spectroscopy and lifetime extension

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Description

Several years ago, the Materials and Process Sciences Center (Org. 1800) was asked by Dept. 9613 to study the materials aging issues which had led to the loss of ballistic protection by Armored Tractor (AT) windshields and windows. The authors speculated that this loss of impact strength was due to photodegradation of the polycarbonate (PC) inboard ply. They developed a spectroscopic method to identify changes in the outboard surface of the PC, and showed that the changes in the surface which occurred upon natural aging in the field could be reproduced by exposing the laminates to a simulated solar flux. ... continued below

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20 p.

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Renschler, C.L.; Stallard, B.R.; White, C.A.; Garcia, M.J. & Morse, H.E. June 1, 1996.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

Several years ago, the Materials and Process Sciences Center (Org. 1800) was asked by Dept. 9613 to study the materials aging issues which had led to the loss of ballistic protection by Armored Tractor (AT) windshields and windows. The authors speculated that this loss of impact strength was due to photodegradation of the polycarbonate (PC) inboard ply. They developed a spectroscopic method to identify changes in the outboard surface of the PC, and showed that the changes in the surface which occurred upon natural aging in the field could be reproduced by exposing the laminates to a simulated solar flux. Based on these results, they recommended changes in the adhesive interlayers to filter out the ultraviolet (UV) light causing the aging problem. Working with the laminate vendor, PPG, they re-designed the laminates to implement these changes and block essentially all UV light from the inboard ply. The most recent phase of this work involved accelerated solar aging of laminates made with the new design to verify that photoaging effects have been blocked by the new materials. They report here the results of that study, and recommended follow-on work.

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20 p.

Notes

OSTI as DE96013207

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  • Other Information: PBD: Jun 1996

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  • Other: DE96013207
  • Report No.: SAND--96-1806
  • Grant Number: AC04-94AL85000
  • DOI: 10.2172/270784 | External Link
  • Office of Scientific & Technical Information Report Number: 270784
  • Archival Resource Key: ark:/67531/metadc664700

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Office of Scientific & Technical Information Technical Reports

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Creation Date

  • June 1, 1996

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • April 14, 2016, 6:33 p.m.

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Renschler, C.L.; Stallard, B.R.; White, C.A.; Garcia, M.J. & Morse, H.E. Photodegradation in ballistic laminates: Spectroscopy and lifetime extension, report, June 1, 1996; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc664700/: accessed September 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.