Method for Assessing Truss System Fatigue Failure Probability Due to Random Vibration

概要

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In this study, the system fatigue failure probability of two-dimensional, multiple-story statically indeterminate truss structures due to stationary random vibration will be investigated. For the example of aeronautical industries, in order to maintain a high standard of structural safety, certain structural components or systems in use should be timely replaced by new ones before their failure probabilities reach a certain critical level. After undergoing a session of random vibration, a truss system can easily have trillions of possible damage modes, the identification and collapse judgement of this gigantic number of modes present an insurmountable analysis workload. In this light, a combinational pivotal decomposition method (CPDM) will be employed in a general manner. The fatigue failure probability of each truss member will be predicted beforehand with the aid of the finite element method, stress crossing analysis and associated material S-N-P fatigue curves. Then, the CPDM method will be incorporated with the component fatigue analysis to assess the truss system failure probability in an innovative, systematic and efficient manner. This is important for judicious decision-making concerning replacement timing of associated truss components or systems.
一般社団法人日本機械学会の論文
1994-04-15