Metal matrix materials reinforced with shape memory fibers for enhanced ductility and energy absorption capacity, and method of manufacturing same
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United States of America Patent
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Feb 15, 2000
Grant Date -
N/A
app pub date -
Dec 8, 1997
filing date -
Dec 8, 1997
priority date (Note) -
Expired
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Abstract
Shape-memory fibers are incorporated into a metal matrix material with a level of fiber-to-matrix bonding so that upon localized failure of matrix under load, the strains in fibers debond them from the matrix to the extent that fibers do not all rupture at the location of matrix failure. The pull-out process of fibers ruptured away from the matrix failure location provides the composite material with substantially increased ductility and energy absorption capacity after localized failure of the matrix. Pre-tensioning of shape-memory fibers impose sustained stresses on matrix which enhance the strength and energy absorption capacity of the composite material. The shape-memory fibers may be incorporated into a metal matrix at their end so that fibers pull out from the matrix under load and provide an energy-absorbing assembly.
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