基于小时间尺度疲劳裂纹扩展理论的结构故障预测和健康管理技术

Prognostic and Health Management that are widely used in the fields of aerospace and military equipment can make the product health status evaluation and maintenance strategies to become more efficient. Structure Prognostic and Health Management diagnose the completion based on the mechanical products or stucture and historical performance state, and make the maintenance decision according to the diagnostic/forecast information, available resources and maintenance requirement. Among the depletion of the failure mechanism that determines the life of the mechanical structure, the material and structrure is one of the main reason of the produce failure. Therefore, the accurate fatigue damage model and real-time fatigue life prediction method is the basis and premise for the mechanical products/structure to conduct SPHM. In this paper, a fatigue crack real-time monitoring technology based on the small time scale theory fatigue crack growth is proposed. This technology can evaluate the structure of the fatigue life and health in real time and accurately based on the fatigue crack detection and mathematical simulation, which improve the safety of structure, reduce the structural maintenance costs effectively.