Fatigue/fracture reliable life estimation for the components under the steady cyclic load

Because of no overload delay effect under the steady cyclic load, the fatigue reliable life of the components is estimated with the use of the fatigue P - S_a - S_m - N surface and the fatigue probabilistic Miner rule. On the basis of the fracture principle and Walker formula, the equation of the fracture P - S_a - S_m - N surface and the fracture probabilistic Miner rule are derived. By means of the fracture P - S_a - S_m - N surface and the fracture probabilistic Miner, the fracture reliable life may be estimated. Finally, an example that the fatigue/fracture reliable life of the motive components on the helicopter are estimated by these method is given.