NCSU MA 574 - Corner Wrinkling of a Square Membrane Due to Symmetric Mechanical Loads (8 pages)

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Corner Wrinkling of a Square Membrane Due to Symmetric Mechanical Loads



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Corner Wrinkling of a Square Membrane Due to Symmetric Mechanical Loads

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Pages:
8
School:
North Carolina State University
Course:
Ma 574 - Mathematical Modeling of Physical Processes II

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JOURNAL OF SPACECRAFT AND ROCKETS Vol 39 No 5 September October 2002 Corner Wrinkling of a Square Membrane Due to Symmetric Mechanical Loads Joseph R Blandino James Madison University Harrisonburg Virginia 22807 John D Johnston NASA Goddard Space ight Center Greenbelt Maryland 20771 and Urmil K Dharamsi James Madison University Harrisonburg Virginia 22807 Thin lm membrane structures are under consideration for use in many future gossamer spacecraft systems Examples include sunshields for large aperture telescopes solar sails and membrane optics The development of capabilities for testing and analyzing pretensioned thin lm membrane structures is an important and challenging aspect of gossamer spacecraft technologydevelopment Results are presented from experimental and computational studies performed to characterize the wrinkling behavior of thin lm membranes under mechanical loading The test article is a 500 mm square Kapton membrane subjected to symmetric corner loads Data are presented for loads ranging from 0 49 to 4 91 N The experimental results show that as the load increases the number of wrinkles increases while the wrinkle amplitude decreases The computational model uses a nite element implementation of Stein Hedgepeth membrane wrinkling theory to predict the behavior of the membrane Comparisons were made with experimental results for the wrinkle angle and wrinkled region There was reasonably good agreement between the measured wrinkle angle and the predicted directions of the major principle stresses The shape of the wrinkled region predicted by the nite element model matches that observed in the experiments however the size of the predicted region is smaller that that determined in the experiments Nomenclature d E K slack K taut K wrinkled L P X Y Z V uence of instrumentationmass on structural behavior and new test methods and noncontact instrumentation are needed These needs are speci cally addressed through the study of analytical and experimental



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