Systems and methods for attachment of materials having different thermal expansion coefficients
An apparatus for attaching two components having different coefficients of thermal expansion includes a mounting member configured to be movably coupled relative to a first component, an attachment member opposite the mounting member and configured to be attached to a second component, and at least one support post interconnecting the mounting member and the attachment member. The apparatus also includes a backer plate including at least one aperture configured to permit at least one fastener to pass therethrough and pass through the second component and through at least one aperture in the attachment member to secure the backer plate and the attachment member to the second component and to attach the second component to the first component. The diameter of the aperture of the backer plate restricts the head of the fastener from passing through the aperture of the backer plate.
1. An attachment apparatus, comprising:
a mounting member movably coupled relative to a first component having a first coefficient of thermal expansion;
an attachment member mounted to a second component having a second coefficient of thermal expansion, the attachment member including at least one aperture therein;
at least one support post interconnecting the mounting member and the attachment member;
a backer plate including at least one aperture having a first diameter;
at least one fastener having a shaft and a head; and
at least one nut threadably engaging threads of the shaft of the at least one fastener and securing the at least one fastener relative to the attachment member;
wherein the shaft passes through the at least one aperture of the backer plate, through the second component, and through the at least one aperture of the attachment member to attach the second component to the first component; and
wherein the head of the at least one fastener has a second diameter that is larger than the first diameter of the at least one aperture of the backer plate.
2. The apparatus of claim 1 , further comprising a track or clip attached to the first component and configured to define a channel that permits the mounting member to slidably move therein in two directions.
3. The apparatus of claim 1 , wherein the mounting member, the attachment member, and the at least one support post are a single unitary monolithic body.
4. The apparatus of claim 1 , wherein at least one of the mounting member or the attachment member is a plate.
5. The apparatus of claim 4 , wherein the plate is a contoured plate including an aperture therein.
6. The apparatus of claim 1 , wherein at least a portion of the at least one support post includes a cutout to reduce a total weight of the at least one support post.
7. The apparatus of claim 1 , wherein, when the apparatus is in use, a primary load direction is perpendicular to the mounting member, the attachment member, and the backer plate.
8. The apparatus of claim 1 , wherein the backer plate is contoured.
9. The apparatus of claim 8 , wherein the backer plate has a first surface and a second surface, the second surface opposite the first surface and wherein the at least one aperture is recessed from the first surface.
10. The apparatus of claim 9 , wherein the head of the at least one fastener is flush with the first surface of the backer plate.
11. The apparatus of claim 1 , wherein the second component includes an aperture configured to permit the at least one fastener to pass therethrough, and wherein a portion of the backer plate passes through at least a portion of the aperture of the second component.
12. The apparatus of claim 1 , wherein the backer plate is made of a material having a third coefficient of thermal expansion that is different from the second coefficient of thermal expansion.
13. The apparatus of claim 1 , further comprising:
at least one thermal spacer secured relative to the attachment member.
14. The apparatus of claim 13 , wherein the at least one thermal spacer is positioned between the at least one nut and the attachment member.
15. The apparatus of claim 13 , wherein the attachment member is positioned between the at least one nut and the at least one thermal spacer and the at least one thermal spacer is positioned between the attachment member and the second component.
16. A system for attaching the second component to the first component, wherein the first component is an aircraft engine component, and wherein the second component is a protective liner configured to protect the first component, the system comprising a plurality of attachment apparatuses identical to the attachment apparatus of claim 1 , wherein the attachment apparatuses are spaced from one another and movably coupled relative to the aircraft engine component and mounted to the protective liner to attach the protective liner to an inwardly-facing surface of the aircraft engine component such that the protective liner fully covers the inwardly-facing surface of the aircraft engine component.
17. The system of claim 16 , wherein the first component is a metallic material and the second component is a ceramic material.