Study on the Residual Strength of Nonlinear Fatigue-Damaged Pipeline Structures

The heat alternation and bending during the service process of the pipeline structure are the key issues affecting its residual strength. The nonuniform plastic deformation of its cross-section causes nonlinear damage to the structure, which makes it difficult to calculate the residual strength of t...

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Bibliographic Details
Published in:Applied sciences 2024-01, Vol.14 (2), p.754
Main Authors: Wei, Wenlan, Zhang, Rui, Zhang, Yuwen, Cheng, Jiarui, Cao, Yinping, Fang, Fengying
Format: Article
Language:English
Subjects:
Analysis
Crack propagation
Deformation
Ductility
Engineering
Failure
Fatigue
fatigue damage
Fatigue testing machines
Heat treating
Load
low-cycle fatigue
Materials
nonlinear damage
pipeline
residual strength
Yield stress
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Summary:The heat alternation and bending during the service process of the pipeline structure are the key issues affecting its residual strength. The nonuniform plastic deformation of its cross-section causes nonlinear damage to the structure, which makes it difficult to calculate the residual strength of the overall structure. This study proposed a novel variable-strength material damage model with damage accumulation, which achieved the coupling analysis of structural damage and material fatigue residual strength, making the structural strength of nonlinear damage cross-section computable. Based on this, a theoretical ultimate load model for nonlinear damage cross-section and a finite element analysis model for dynamic material strength with damage accumulation were established. The analysis was conducted on the repeated banding damage to coiled tubing. The results showed that the residual yield strength of nonlinear damaged coiled tubing showed a trend of first rapid decrease and then slow decrease with damage accumulation, and the tensile displacement showed an increasing trend with damage accumulation. The ultimate internal pressure strength of nonlinear damaged structures showed a similar downward trend to the yield strength. The nonlinear damage coupling analysis model proposed in this study has significant practical engineering application value.
ISSN:2076-3417
2076-3417
DOI:10.3390/app14020754