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Shingled laminated porous material

  • US 4,312,186 A
  • Filed: 10/17/1979
  • Issued: 01/26/1982
  • Est. Priority Date: 10/17/1979
  • Status: Expired due to Term
First Claim
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1. In a combustor assembly adapted for disposition in an air inlet plenum of a gas turbine engine and including a porous laminated wall structure having a first lamina and a second lamina with diffusion bond means therebetween for structural integrity, at least one of said first and said second lamina having coolant air distribution means therein in the form of relieved passage means of predetermined depth in said one lamina to permit coolant air flow between a plurality of pores in each of said first and said second lamina, said one lamina having minimum thickness at the deepest portion of said relieved passage means, the improvement comprising means on said one lamina defining a pattern of interconnecting stress relief grooves which cooperate with said relieved passage means in defining crack sections coextensive with said relief grooves and, having depth less than said minimum thickness so that thermal stress induced by a temperature gradient across said wall structure is concentrated at said crack sections to fracture said one lamina thereat into a plurality of separate shingles thereby preventing excessive stress formation in said wall structure.

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