Paper
13 November 2014 Stress failure vignettes: errors of 10,000, the help of Humpty-Dumpty, and others
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Abstract
In the latter part of the 1980’s, an all glass aircraft window, required for photography, was designed for 10,000 hours of life under extreme environments, consisting of high altitude thermal gradients and high pressure differential. Further, the window would need to survive its lifetime in the presence of airborne dust particles at high speed, runway sand and debris, hailstone impact, and frequent handling and cleaning conditions, the latter of which could cause scratches. Analysis showed a lifetime well in excess of 1,000,000 hours, but tests indicated failure times well below 1000 hours. The apparent disconnect was due to the presence of residual stress, heretofore not considered. Additionally, premature hailstone test failure required further assessment to ensure survivability. An extensive redesign resulted in the first ever FAA approval for glass window design in a passenger cabin.
© (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
John W. Pepi "Stress failure vignettes: errors of 10,000, the help of Humpty-Dumpty, and others", Proc. SPIE 9197, An Optical Believe It or Not: Key Lessons Learned III, 91970G (13 November 2014); https://doi.org/10.1117/12.2066942
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KEYWORDS
Glasses

Failure analysis

Manufacturing

Photography

Statistical analysis

Analytical research

Particles

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