Method for predicting deep-sea pipeline low-cycle fatigue crack initiation by using cyclic cohesion model
By incorporating the characteristics of pipeline steel materials and the low-cycle fatigue damage mechanism into the cyclic cohesion model, a finite element calculation framework was established, which solved the problem that existing technologies cannot accurately predict the initiation of low-cycle fatigue cracks in deep-sea pipelines. This enabled accurate prediction of fatigue crack initiation life and reduced the difficulty of obtaining model parameters.
Patent Information
- Application Number
- CN202310515777.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-05-09
- Publication Date
- 2026-07-28
- Estimated Expiration
- 2043-05-09
AI Technical Summary
Existing cyclic cohesion models cannot accurately predict the initiation process of low-cycle fatigue cracks in deep-sea pipelines, as they do not take into account the characteristics of pipeline steel materials and the material damage characteristics in low-cycle fatigue.
The material characteristics of pipeline steel and the damage mechanism of materials in low-cycle fatigue are introduced into the cyclic cohesive model. A finite element calculation framework is established. By calculating the structural stress and deformation data, and combining monotonic damage and cyclic damage, the number of output loads when fatigue cracks initiate is determined.
It enables reasonable prediction of low-cycle fatigue crack initiation in deep-sea pipelines, improves prediction accuracy, and reduces the difficulty of obtaining model parameters and experimental costs.