The failure more if truly analyzed would probably resemble the failure of other composite structures in a vibratory or LCF environment. In that the matrix degrades and separates from the fibers. When the fibers are no longer combined with the matrix they do not share the load and individual fibers can be overloaded and suffer tensile failure one by one as the structure unzips and fully fails.
That is, in the flapping the strands become detached from the Mylar, or the Mylar fails and then the fibers break one by one until there is not enough left to hold and zip it comes apart.
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