Rotary wing aircraft bearing for rotary wing aircraft motions

A rotary wing aircraft bearing to provide a rotary wing motion between a first rotary wing aircraft member and a second rotary wing aircraft member, said bearing including an elastomeric bonded laminated bearing stack, said elastomeric bonded laminated bearing stack including a plurality of bonded alternating layers of a nonelastomeric shim member layer and an elastomeric shim member layer,

• a predetermined first elastomeric shim member layer comprised of a first elastomer region, said first elastomer region comprised of an first cured elastomer composition having at least a first optical characteristic ingredient, and a second elastomer region, said second elastomer region proximate an exterior surface, said second elastomer region comprised of a second cured elastomer composition having at least a second optical characteristic ingredient, said at least second optical characteristic ingredient different than said first cured elastomer composition first optical characteristic ingredient, wherein a rotary wing motion elastomer void crack propagating from said exterior surface inward towards an interior of a bearing interior elastomer region with said rotary wing motion generates a plurality of first cured elastomer composition crumbs expelled from said elastomer void crack, said first cured elastomer composition crumbs optically distinguishable from said second cured elastomer composition.

A bearing to provide a constrained relative motion between a first member and a second member, said bearing including

• an elastomeric mold bonded bearing stack, said elastomeric mold bonded bearing stack including at least a first mold bonded elastomeric shim layer, said at least first mold bonded elastomeric shim layer having an exterior surface and an interior center distal from said exterior surface,
• said first mold bonded elastomeric shim layer comprised of an enclosed 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 said first mold bonded elastomeric shim layer comprised of 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 second exterior optical characteristic ingredient different than said interior cured elastomer composition first interior optical characteristic ingredient, wherein an elastomer void crack propagating from said exterior surface inward towards said interior elastomer region and a repeated relative motion between said first member and said second 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.