Fan case design with metal foam between Kevlar
First Claim
1. A fan blade fragment containment assembly for a gas turbine engine, comprising:
- a fan case having an inner surface, surrounding a fan mounted for rotation about an engine axis, and an outer surface, the fan case having a circumferential axially extending blade fragment impact zone;
a deformable layer mounted to the fan case outer surface and enveloping the impact zone;
a compressible layer mounted on an outer surface of the deformable layer;
a friction reduction layer mounted on an outer surface of the compressible layer; and
a containment layer mounted on an outer surface of the friction reduction layer.
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Accused Products
Abstract
A fan blade fragment containment assembly for a gas turbine engine having a fan case surrounding the fan and having a circumferential axially extending blade fragment impact zone. An inner relatively slack or low tension deformable layer of Kevlar™ or Zylon™ fabric is mounted to the fan case outer surface and envelopes the impact zone. A compressible (ex. metal foam or honeycomb) layer is mounted on an outer surface of the deformable layer. A friction reduction layer of Teflon™ is mounted on an outer surface of the compressible layer and an outer relatively taut higher tension containment layer of Kevlar™ or Zylon™ fabric is mounted on an outer surface of the friction reduction layer. The friction reduction layer enhances the distribution of impact forces about the circumference of the compressible layer by reducing local shear stresses between the compressible layer and the containment layer.
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Citations
5 Claims
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1. A fan blade fragment containment assembly for a gas turbine engine, comprising:
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a fan case having an inner surface, surrounding a fan mounted for rotation about an engine axis, and an outer surface, the fan case having a circumferential axially extending blade fragment impact zone;
a deformable layer mounted to the fan case outer surface and enveloping the impact zone;
a compressible layer mounted on an outer surface of the deformable layer;
a friction reduction layer mounted on an outer surface of the compressible layer; and
a containment layer mounted on an outer surface of the friction reduction layer. - View Dependent Claims (2, 4, 5)
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3. A fan blade fragment containment assembly according to crushable layer selected from the group consisting of:
- a metal foam;
a honeycomb structure;
an expanded metal sheet;
sintered metal particles; and
spray applied metal particles.
- a metal foam;
Specification