Patent ID: 6901810

Claim:
A method of simulating a cyclic state of Stress in a part, comprising: a. installing a par to be tested within a fixture that is adapted to bold said part; b. subjecting said fixture to a rotational speed that is greater than or equal to zero; and c. varying said rotational speed in accordance with a cyclic pattern, wherein said cyclic pattern comprises a number of cycles, each cycle of said number of cycles comprising i. a first rotational speed related to a first state of stress; and ii. a second rotational speed related to a second state of stress, wherein said second rotational speed is greater than said fist rotational speed, said first state of stress corresponds to a first thermal condition of said part, said second state of stress corresponds to a second thermal condition of said part, and said number of cycles are representative of at least a portion of an expected lifetime of said part under conditions in which said part is intended to be used.