Service Life Determination for the UH-60A (BLACKHAWK) Helicopter Elastometric Bearings
CR INDUSTRIES ELK GROVE VILLAGE IL MECHANICAL PRODUCTS DIV
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The contract with AMMRC calls for developing an improved method of predicting the service life of elastomeric bearings in general with specific reference to the Blackhawk main rotor bearings. One object of this study is to develop a correlation between a bearing that has sustained some endurance damage and its remaining service life based on its appearance. The second objective is to develop an analytical capability to predict the service life of bearings without the necessity for testing. An endurance rating for an appropriate elastomer is determined by testing a series of 13 test specimens. The test specimen and the Blackhawk main rotor bearings are analysed by finite element methods. A procedure is developed for relating the complex strain history of the Blackhawk bearings to the endurance data so that a life prediction can be made for the main rotor bearings without testing. The main rotor bearings are then tested and experimental and analytical results compared.
- Elastomers and Rubber
- Machinery and Tools