Ceramic and ceramic matrix composite attachment methods and systems
Attaching a fastener to a ceramic matrix composite or ceramic body by inserting a portion of the fastener into a compartment of the body, the compartment having a first portion and a second portion, the second portion outboard of and narrower than the first portion; and delivering a fluid into the fastener to expand a portion of the fastener within the blind compartment first portion.
1. A method for mounting attaching a ceramic matrix composite or ceramic body, the method comprising:
attaching a fastener to the ceramic matrix composite or ceramic body by:
inserting a portion of the fastener into a compartment of the body, the compartment having a first portion and a second portion, the second portion outboard of and narrower than the first portion; and
delivering a fluid into the fastener to expand a portion of the fastener within the compartment first portion;
passing a threaded shank of the fastener through a hole in a mounting structure; and
installing and tightening a nut to the shank.
2. The method of claim 1 wherein:
the compartment is a blind compartment.
3. The method of claim 1 wherein:
the method comprises engaging a fluid source to the shank before the delivering and disengaging the fluid source from the shank after the delivering.
4. The method of claim 1 further comprising:
heating a portion of the fastener.
5. The method of claim 1 further comprising forming the blind compartment by:
laterally shifting a rotating bit, the rotating bit having a protuberant cutting or grinding portion that forms the blind compartment first portion.
6. The method of claim 5 wherein the forming the blind compartment further comprises:
forming an initial bore.
7. The method of claim 5 wherein:
the lateral shifting comprises a circular shift.
8. The method of claim 1 wherein:
the body is a combustor panel body.
9. The method of claim 4 wherein:
the heating is induction heating that selectively heats the metal relative to the ceramic matrix composite or ceramic body.
10. The method of claim 4 wherein:
the heating is infrared heating that locally heats a surface of the ceramic matrix composite or ceramic body opposite the fastener so that the ceramic matrix composite or ceramic body, then heats the fastener via conduction.
11. A mounted panel assembly comprising:
a mounting structure having a hole in the mounting structure;
a ceramic matrix composite or ceramic body, the body having a compartment, the compartment having a first portion and a second portion, the second portion outboard of and narrower than the first portion; and
a fastener having:
an expanded portion deformed to protuberance within the compartment first portion; and
a threaded shank passing through the hole in the mounting structure and held by a nut.
12. The panel assembly of claim 11 wherein:
the compartment is a blind compartment.
13. The panel assembly of claim 11 wherein:
the expanded portion is hollow.
14. The panel assembly of claim 13 wherein:
the expanded portion interior is continuous with a hollow portion of the shank.
15. The panel assembly of claim 11 wherein:
the body is shaped as a segment of a frustoconical shell.
16. A gas turbine engine comprising the panel assembly of claim 11 wherein:
the panel is along a gaspath of the gas turbine engine.
17. The gas turbine engine of claim 16 wherein:
the panel is selected from the group consisting of combustor panels, blade outer air seals, and exhaust nozzle liners.