Aluminum Metal Matrix Composite Liner Testing

Bearing liners are used in rotorcraft gearboxes to reduce wear between the bearing race and housing during aircraft operations. Bearing liners are typically made of steel, but a new aluminum Metal Matrix Composite (MMC) bearing liner material is currently being developed under the Future Advanced Rotorcraft Drive System (FARDS) program. These new bearing liners have the benefit of reduced weight compared to existing steel liners. Seeded fault testing was performed which demonstrated the liners ability to withstand the loads generated due to failing bearings and still left the housing assembly in serviceable condition after removal. The test was in support of a viability study evaluating use of aluminum MMC liners for weight savings.