Patent ID: 9068621
Filing Date: 2015-06-30
Classification: B32B,B64C,B64D,F16C,F16F,G01M,G01N,Y10T

Abstract:
1. A rotary wing aircraft bearing to provide a constrained relative motion between a first rotary wing aircraft member and a second rotary wing aircraft member, said bearing including an elastomeric mold bonded laminated bearing stack, said elastomeric mold bonded laminated bearing stack including a plurality of mold bonded alternating layers of nonelastomeric shim member layers and elastomeric shim member layers, said alternating layers having an exterior surface and an interior center distal from said exterior surface, at least one of said elastomeric shim member layers comprised of an interior elastomer region distal from said exterior surface, said interior elastomer region comprised of an interior cured elastomer composition having at least a first interior optical characteristic ingredient, and an exterior elastomer region encompassing said interior elastomer region, said exterior elastomer region proximate said exterior surface, said exterior elastomer region comprised of an exterior cured elastomer composition having at least a second exterior optical characteristic ingredient, said at least a second exterior optical characteristic ingredient different than said interior cured elastomer composition first interior optical characteristic ingredient, wherein with an elastomer void crack propagating from said exterior surface inward towards said interior elastomer region and a repeated rotary wing aircraft relative motion between said first rotary wing aircraft member and said second rotary wing aircraft member generates a plurality of interior cured elastomer composition crumbs to be expelled from said elastomer void, said interior cured elastomer composition crumbs optically distinguishable from said exterior cured elastomer composition.