Fan track liner designed to yield next to fan case hook

1. A fan track liner assembly for use with a fan containment case for a gas turbine engine comprising:

a fan track body extending axially from a forward section to an aft section, the fan track body including a first surface, an inner core and a second surface, the first surface is made of abradable material and is operable to engage a blade member, the inner core disposed radially between the first surface and the second surface and is made of collapsible material that is operable to be deformed during a catastrophic condition, the second surface disposed radially outwards from the first surface;

a first mounting member extending from the forward section of the fan track body for engaging a fan case hook; and

a second mounting member extending from the aft section of the fan track body;

a tray disposed between an inside surface of a cavity of a fan case and the fan track body, the fan track body being arranged in the tray;

wherein the first surface and the second surface extend axially along the inner core and provides a vacancy in a radial direction along a forward face of the inner core to facilitate deformation of the forward section of the fan track body into a void disposed in an area between the fan track body and the inside surface of the fan case during the catastrophic condition; and

wherein the tray includes a hook-shaped portion extending axially outward from the forward section of the fan track body along the inside surface of the fan case and radially inwards to circumscribe the void, the hook-shaped portion defining the first mounting member, the hook-shaped portion having a lip extending in an axially downstream direction structured and arranged to engage the fan case hook and end forward of an aft side of the fan case hook.

2. The fan track liner assembly as claimed in claim 1 , wherein the forward section defines an axial face disposed adjacent to the void and aft of the fan case hook.

3. The fan track liner assembly as claimed in claim 1 , wherein the tray has a plurality of apertures distributed circumferentially along the hook-shaped portion for receiving fasteners that secure the hook-shaped portion to the fan case hook.

4. The fan track liner assembly as claimed in claim 1 , wherein the second surface of the fan track body includes a skin adhesively bonded to the tray.

5. The fan track liner assembly as claimed in claim 1 , wherein the inner core is made of a honey-comb material that is filled with epoxy.

6. The fan track liner assembly as claimed in claim 1 , wherein the fan track body is a single-piece split ring shaped configuration.

7. A fan track liner assembly for a gas turbine engine comprising:

a fan containment case, the fan containment case including a fan case hook, a cavity, and a mounting member;

a fan track liner configured to fit substantially within the cavity of the fan containment case, the fan track liner having a forward section and an aft section, wherein the fan track liner includes a first layer of abradable material, a radially outer second layer, and an inner core disposed between the first layer and the second layer;

the forward section configured to interact with the fan case hook to provide a void disposed in the cavity near the fan case hook at an axial face of the forward section of the fan track liner; and

an axially extending lip disposed at the forward section and coupled to a forward edge of the first layer, wherein the axially extending lip protrudes axially from the forward section and engages onto a radially outer side of the fan case hook; and

wherein the first layer and the second layer extend axially along the inner core and the axial face of the forward section is disposed aft of the void to facilitate deformation of the fan track liner near the fan case hook during a catastrophic event.

8. The fan track liner assembly as claimed in claim 7 , wherein the fan track liner is preloaded in a forward and radial direction against an inside surface of the fan containment case.

9. The fan track liner assembly as claimed in claim 7 , wherein the axially extending lip rests on the radially outer side of the fan case hook, and the second layer defines a nose in the forward section arranged at a position disposed radially outwards of the inner core.

10. The fan track liner assembly as claimed in claim 7 , wherein the fan track liner forms a 360 degree circle, and has a split portion.

11. The fan track liner assembly as claimed in claim 7 , wherein the second layer includes a plurality of raised surfaces impinging against an inside surface of the fan containment case.

12. The fan track liner assembly as claimed in claim 7 , wherein the fan containment case further includes an axially forward radially extending wall and the fan case hook extends axially from the radially extending wall, and wherein the axially extending lip is disposed radially outwards of the fan case hook and axially overlaps the radially outer side to provide a radial interference between the fan track liner and the fan containment case.

13. The fan track liner assembly as claimed in claim 7 , wherein the second layer includes an aft mounting portion fastened to the mounting member of the fan containment case.

14. The fan track liner assembly as claimed in claim 9 , wherein the nose of the second layer is wedged against an inside surface of the fan containment case such that the forward section is wedged in place by the axially extending lip and the nose.

15. The fan track liner assembly as claimed in claim 14 , wherein the nose protrudes radially from the second layer.

16. A fan track liner assembly for a gas turbine engine having a longitudinal axis, comprising:

a fan case defining a cavity disposed axially between a forward radially extended wall and an aft radially extended wall, the fan case including a fan case hook protruding axially from the forward radially extended wall;

a fan track liner received in the cavity and having a forward section configured to interact with the forward radially extended wall and an aft section configured to interact with the aft radially extended wall, the fan track liner including a first layer of abradable material, a radially outer second layer, and an inner core disposed radially between the first layer and the second layer;

the forward section of the fan track liner having a forward axial face spaced away from the fan case hook in an axially aft direction to provide a void aft of the fan case hook; and

an axially extending strip of material disposed at the forward section in a gap defined axially between the forward axial face and the fan case hook, wherein the axially extending strip extends from the first layer and bridges the gap between the forward axial face and the fan case hook radially inwards of the void to provide an aerodynamic flow path with a reduced strength.

17. The fan track liner assembly as claimed in claim 16 , wherein the axially extending strip is secured to a forward edge of the first layer and is mounted on an aft end of the fan case hook.

18. The fan track liner assembly as claimed in claim 16 , wherein the second layer includes a hook-shaped portion extending axially outward from the forward axial face of the forward section along the cavity and towards the forward radially extended wall to circumscribe the void, and wherein the hook-shaped portion is mounted on a radially outer surface of the fan case hook.

19. The fan track liner assembly as claimed in claim 16 , wherein the axially extending strip is composed of a pliable material.

20. The fan track liner assembly as claimed in claim 16 , wherein the fan case includes a support member extending radially into the cavity disposed between the aft radially extended wall and the forward radially extended wall, and wherein the fan track liner has a recessed portion disposed between the forward section and the aft section secured to the support member.