A5024530718- Fatigue and fracture mechanics
- Structural Integrity and Reliability Analysis
- Non-Destructive Testing Techniques
- Material Properties and Failure Mechanisms
- Hydrogen embrittlement and corrosion behaviors in metals
- Welding Techniques and Residual Stresses
- Metal Alloys Wear and Properties
- Mechanical stress and fatigue analysis
- Metallurgy and Material Forming
- Microstructure and Mechanical Properties of Steels
- Geotechnical Engineering and Underground Structures
Xi'an Jiaotong University
2022-2024
China National Petroleum Corporation (China)
2022-2023
Due to the wide application of flux-cored arc welds (FCAW) susceptible significant scatter in weld and Heat Affected Zone (HAZ) fracture toughness, there is an interest methods for evaluating reliability containing defects. The mechanical properties FCAW girth X80 pipeline are tested then analyzed. By obtaining toughness results from a statistically number SENB specimens, with notches positioned different HAZ locations, effect variation within can be evaluated. tests were analyzed using...
The hot deformation behavior of high-grade pipeline steels was studied in the strain rate range 0.001~0.1 s−1 and temperature 1050~1200 °C by using compression tests on a Gleeble 3500 thermomechanical simulator. flow stress increases with increase decrease temperature, activation energy is about 358 kJ/mol. flows stress–strain work-hardening dynamic recovery (DRV) calculated Estrin–Mecking equation, kinetics model recrystallization (DRX) established based Avrami equation through...
In this paper, a strain capacity assessment on high-strain marine pipe was carried out by comparing the crack growth driving force and resistance. The given FEA, stress-stain relationship DIC tensile test, resistance single-edge notched (SENT) test using single-specimen flexibility method. proposed approach compared with failure curve validated against full-scale tests girth weld notch. results of showed that method FEA more accurate result conservative.
As an important component of strain-based design, the tensile strain capacity (TSC) concept has been extensively used for pipelines that experience expectable plastic both installation and service. However, some stress-based designed have experienced unforeseen in past decade resulted failure. It seems gradually become requirement geohazard risk management pipeline maintenance design pipelines. The X80 is investigated. assessment this work was based on fracture initiation–control-based limit...
Abstract In general, transmission pipelines are designed by hoop stress induced internal pressure, and maximum longitudinal stress. The paper is mainly about the failure analysis of an X80 pipeline brittle fracture on girth weld under in-service strain. digital image correlation (DIC) in tensile tests was used to analyze permanent plastic strain metal Then, Charpy energy with concentrated tested evaluate deterioration toughness. Finally, mechanism clarified. results show that welds may have...