Fatigue Damage Accumulation Under Non-Gaussian Loads

by S. Sarkani, George Washington Univ, Washington, United States,
D. P. Kihl, George Washington Univ, Washington, United States,
J. E. Beach, George Washington Univ, Washington, United States,



Document Type: Proceeding Paper

Part of: Structural Engineering in Natural Hazards Mitigation

Abstract:

The stochastic fatigue life prediction method, namely the Rayleigh approximation method, is almost exact when the loading is both normal (Gaussian) and narrowband. However, in many realistic situations, the structural responses (particularly in a marine environment)can be highly non-normal. In order to more accurately understand the influence of non-normality on fatigue damage predictions, an extensive analytical/simulation and experimental study is being conducted. Results indicate that as the loading becomes more non-normal there casn be either an acceleration or deceleration in the rate of fatigue damage accumulation, depending on the statistics of the non-normal process.

Subject Headings: Fatigue life | Approximation methods | Load factors | Gaussian process | Structural response | Statistics | Service loads

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