Ultrasonic method of fabricating a thermosetting matrix fiber-reinforced composite structure and the product thereof
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United States of America Patent
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Aug 13, 2002
Issued Date -
N/A
app pub date -
Oct 19, 2000
filing date -
Mar 1, 1991
priority date (Note) -
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Abstract
A method of fabricating a thermosetting matrix, fiber reinforced composite structure wherein a stack of fiber reinforced thermosetting material plies are assembled; an ultrasonic horn is engaged with a top surface of the upper most ply, oriented at an acute angle with respect to the top surface, and energized to induce a shear wave in the plies to heat the plies. The horn is moved along the upper most ply to consolidate the plies and the energy level applied to the horn is sufficient to reduce the viscosity of the thermoset resin to the point where the plies can be debulked but not high enough to fully cross-link the resin so that another ply can still be fully cross-linked to the uppermost ply. Pressure is applied to the plies as the horn moves to debulk the plies.
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