National Technical Reports Library

The National Technical Information Service acquires, indexes, abstracts, and archives the largest collection of U.S. government-sponsored technical reports in existence. The NTRL offers online, free and open access to these authenticated government technical reports. Technical reports and documents in its repository may be available online for free either from the issuing federal agency, the U.S. Government Publishing Office’s Federal Digital System website, or through search engines.

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X-20 High Temperature Side Window Test Evaluation.

AD477758

Publication Date	1965
Personal Author	McGinnis, J. C.
Page Count	220
Abstract	The purpose of this program was to experimentally verify the X-20A side window assembly and provide experience for improved window design. The objective was to verify the structural integrity of an X-20A high temperature window design in the X-20A flight environment and provide test data to evaluate the design analysis and development procedures utilized. The window was subjected to a low-level boost vibration environment, outward acting (partial vacuum) limit boost pressure of 7.7 psia, and a simulated reentry heating time-temperature history. The window failed during the re-entry temperature cycle. The primary cause of failure was the high temperature gradient through the depth of the window frame of approximately 850 F which exceeded by a factor of 2 the ultimate design value. The extreme thermal gradient caused thermal curvature of the window frame which induced glass curvature in excess of allowable. Measured temperature and deflections are presented and compared with analytical values. A thermal analysis is presented and compared with test values. Deficiencies of the X-20 window design as determined from the test program are pointed out and suggested methods of improvement are given. (Author)
Keywords	Heat resistant glass Boost glide vehicles Transparent panels Windshields Silicon compounds Silicone plastics Aluminum compounds High temperature Environmental tests Design Vibration Pressure Failure(Mechanics) Manufacturing Seals Chromium alloys Cobalt alloys Nickel alloys Reentry vehicles Nickel alloy hastelloy Nickel alloy rene 41 Windows X-20 spacecraft
Source Agency	Non Paid Delimited ADS
NTIS Subject Category	71D - Ceramics, Refractories, & Glass 84C - Manned Spacecraft
Corporate Authors	Boeing CO Seattle Wash Aerospace Group
Supplemental Notes	Report on Window Systems Concepts.
Document Type	Technical Report
Title Note	Final technical rept. 27 Apr 64-1 Aug 65.
NTIS Issue Number	197715
Contract Number	AF33(615)-2013

X-20 High Temperature Side Window Test Evaluation.

X-20 High Temperature Side Window Test Evaluation.
AD477758

Publication Date	1965
Personal Author	McGinnis, J. C.
Page Count	220
Abstract	The purpose of this program was to experimentally verify the X-20A side window assembly and provide experience for improved window design. The objective was to verify the structural integrity of an X-20A high temperature window design in the X-20A flight environment and provide test data to evaluate the design analysis and development procedures utilized. The window was subjected to a low-level boost vibration environment, outward acting (partial vacuum) limit boost pressure of 7.7 psia, and a simulated reentry heating time-temperature history. The window failed during the re-entry temperature cycle. The primary cause of failure was the high temperature gradient through the depth of the window frame of approximately 850 F which exceeded by a factor of 2 the ultimate design value. The extreme thermal gradient caused thermal curvature of the window frame which induced glass curvature in excess of allowable. Measured temperature and deflections are presented and compared with analytical values. A thermal analysis is presented and compared with test values. Deficiencies of the X-20 window design as determined from the test program are pointed out and suggested methods of improvement are given. (Author)
Keywords	Heat resistant glass Boost glide vehicles Transparent panels Windshields Silicon compounds Silicone plastics Aluminum compounds High temperature Environmental tests Design Vibration Pressure Failure(Mechanics) Manufacturing Seals Chromium alloys Cobalt alloys Nickel alloys Reentry vehicles Nickel alloy hastelloy Nickel alloy rene 41 Windows X-20 spacecraft
Source Agency	Non Paid Delimited ADS
NTIS Subject Category	71D - Ceramics, Refractories, & Glass 84C - Manned Spacecraft
Corporate Authors	Boeing CO Seattle Wash Aerospace Group
Supplemental Notes	Report on Window Systems Concepts.
Document Type	Technical Report
Title Note	Final technical rept. 27 Apr 64-1 Aug 65.
NTIS Issue Number	197715
Contract Number	AF33(615)-2013