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  • 1980-1984  (3)
  • 1
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    Unknown
    Effects of solar radiation on glasses (1984)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: The effects of solar radiation and space environment on glasses in space flight by exposing glass specimens to the space environment was determined. The occurrence of optical, mechanical, and chemical property changes was analyzed. The property changes of samples receiving differing cumulative solar radiation exposure are compared.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA. Langley Research Center Long Duration Exposure Facility (LDEF); p 170-172
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Materials testing of the IUS techroll seal material (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: As a part of the investigation of the control system failure Inertial Upper Stage on IUS-1 flight to position a Tracking and Data Relay Satellite (TDRS) in geosynchronous orbit, the materials utilized in the techroll seal are evaluated for possible failure models. Studies undertaken included effect of temperature on the strength of the system, effect of fatigue on the strength of the system, thermogravimetric analysis, thermomechanical analysis, differential scanning calorimeter analysis, dynamic mechanical analysis, and peel test. The most likely failure mode is excessive temperature in the seal. In addition, the seal material is susceptible to fatigue damage which could be a contributing factor.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-86462 , NAS 1.15:86462
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Materials investigation of STS-3 parachute failure (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Main parachute, No. 2 of SRB A-12 on STS-3, sustained damage during deployment or initial inflation that resulted in its collapse and failure to sustain load. During an investigation of the materials from this parachute, optical and scanning electron microscope analyses were conducted. This examination identified stains and abrasions on vent lines that appear to have been a result of friction contact with its flotation bag lanyard. Mechanical testing of the vent band indicated a reduction in strength of 37 percent obviously due to structural overload, heat, and ocean water exposure. It is concluded from this and other available data that entanglement of parachutes No. 1 and No. 2 during deployment caused adequate structural damage to main parachute No. 2 to render it unable to carry load.
    Keywords: SPACE TRANSPORTATION
    Type: NASA-TM-82540 , NAS 1.15:82540
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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