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US 2014/0260281 A1Published application
Auxetic structure with stress-relief features
AssigneeRolls-Royce Canada, Ltd.
InventorMatthew Christopher Innes
Life of this patent
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Abstract
A material which exhibits auxetic characteristics and control of thermal expansion characteristics while experiencing significant stress reduction is disclosed. The material has a repeating pattern of void structures along both lateral symmetry lines and longitudinal symmetry lines.
Claims20
A material exhibiting reduced stress comprising:
- a plurality of longitudinal symmetry lines and a plurality of lateral symmetry lines extending along the material, where the longitudinal symmetry lines are generally perpendicular with the lateral symmetry lines;
- a pattern of void structures in the material, where the void structures extend along the longitudinal symmetry lines and the lateral symmetry lines;
- wherein the void structures have a shape comprising a slot with two ends, and a stress-reducing portion disposed at each end of the slot;
- and
- wherein the pattern relieves stress in the material.
2 more elements
A stress relief system for a gas turbine engine comprising:
- a combustor liner having at least one wall;
- the combustor liner made of a material having a longitudinal symmetry line and a lateral symmetry line;
- a pattern of void structures in the combustor liner material, the pattern having a plurality of void structures having a shape extending along the longitudinal symmetry line, and a plurality of void structures having the shape extending along the lateral symmetry line;
- wherein the shape is selected from the group:
- barbell, compressed barbell, pince-nez, reverse pince-nez, question mark, compressed question mark, hook, reverse hook, and J-hook, and
- wherein the pattern relieves stress in the combustor liner material.
3 more elements
A method of fabricating a material that reduces stress in the material, comprising:
- providing a sheet of material;
- inserting an initial cut in the material in a portion of the material that will be discarded;
- extending the initial cut to cut a hole in the material;
- extending the cut from the hole into a slot;
- cutting a second hole in the material at the end of the slot, resulting in a barbell-shaped void structure in the material;
- removing and discarding the material from the interior of the holes;
- cutting a plurality of barbell-shaped void structures in the material in the same manner;
- wherein the barbell-shaped void structures extend along one of a plurality of longitudinal symmetry lines and a plurality of lateral symmetry lines that are generally perpendicular to the longitudinal symmetry lines, such that the void structures along the longitudinal symmetry lines are between two void structures disposed along lateral symmetry lines and the void structures along lateral symmetry lines are between two void structures disposed along longitudinal symmetry lines.
5 more elements
Dependencies are inferred from the claim text.