# US 5,344,280 A · Impact resistant fan case liner

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- Number: US 5,344,280 A
- Document ID: US5344280A
- Status: Granted
- Kind: A
- Application number: 08/058,643
- Filed: 1993-05-05
- Granted: 1994-09-06
- Earliest claimed: 1993-05-05
- Assignees: General Electric Company
- Inventors: Leslie L. Langenbrunner; Richard T. Price; Jack W. Baldwin
- Web page: https://patentgrep.com/patent/US5344280A

## CPC

- F02C 7/045: having provisions for noise suppression
- F01D 21/045: {special arrangements in stators or in rotors dealing with breaking-off of part of rotor}
- F05D 2220/327: to drive shrouded, high solidity propeller
- Y02T 50/60: Efficient propulsion technologies, e.g. for aircraft
- Y10T 428/24149: Honeycomb-like
- Y10T 428/24992: Density or compression of components
- F02C: GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS (construction of turbines F01D; jet-propulsion plants F02K; construction of compressors or fans F04; generating combustion products of high pressure or high velocity F23R; using gas turbines in compression refrigeration plants F25B11/00)
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A composite article includes a plurality of laminates each having structural fibers bonded in a matrix, and an adhesive film disposed between and bonding together adjacent ones of the laminates. In an exemplary embodiment, the laminates and the interleaved adhesive films form a facesheet which is joined to a core for forming an impact resistant fan case impact liner for a gas turbine engine. The impact liner may be integrated with a sound suppression liner.

## Claims

### Claim 1

A fan case liner for a gas turbine engine comprising:
an integral facesheet including a plurality of laminates each having structural fibers bonded in a matrix, and a toughened adhesive film disposed between and bonding together adjacent ones of said laminates;
a first structural support core, and another adhesive film disposed between and bonding together said facesheet and said first core;
a second structural support core;
a first septum disposed between said first and second cores;
additional adhesive films disposed between and bonding together said first septum and said first core, and said first septum and said second core; and
wherein said first core has a first compressive strength, and said second core has a second compressive strength less than said first compressive strength.

### Claim 2 (depends on 1)

An linear according to claim 1 in the form of an annular fan case impact liner for a gas turbine engine adapted to be disposed downstream from a fan thereof, and wherein said facesheet faces radially inwardly for being impacted by foreign objects thrown from said fan during rotation thereof; said liner further comprising:
a backsheet disposed radially outwardly of said second core; and
another adhesive film disposed between and bonding together said backsheet and said second core.

### Claim 3 (depends on 2)

A liner according to claim 2 wherein said facesheet is imperforate.

### Claim 4 (depends on 2)

A liner according to claim 2 in combination with a sound suppression linear extending downstream from said impact liner and formed integrally therewith for suppressing sound generated by said fan during operation.

### Claim 5 (depends on 4)

A liner combination according to claim 4 further comprising:
a third structural support core;
a second septum disposed between said second and third cores;
additional adhesive films disposed between and bonding together said second septum and said second core, and said second septum and said third core; and
said backsheet being joined by said adhesive film to said third core instead of said second core.

### Claim 6 (depends on 5)

A linear combination according to claim 5 wherein said third core has a third compressive strength, said first compressive strength being greater than each of said second and third compressive strengths.

### Claim 7 (depends on 6)

A liner combination according to claim 6 wherein said second compressive strength is substantially equal to said third compressive strength.

### Claim 8 (depends on 7)

A liner combination according to claim 7 wherein all of said adhesive films are toughened and have a peel strength greater than about 7 kg/cm.