Calculation of SIFs for semi-elliptical surface cracks in U-shaped bellows expansion joints of Es-Salam research reactor vessel

Saad, Djillali; Dundulis, Gintautas; Janulionis, Remigijus

doi:10.1016/j.engfailanal.2020.104481

Cited by 6 publications

(2 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The finite element model is divided into 15,676 elements using C3D8R elements. In order to improve the calculation efficiency and accuracy, according to the research results of the literature [27], the concentrated deformation area is divided into finer meshes. The elastic modulus is 205 GPa, the Poisson's ratio is 0.3, the yield strength is 270 MPa, and the Mises yield criterion was selected.…”

Section: Finite Element Analysismentioning

confidence: 99%

Stability Characteristics and Mechanism of U-Shaped Metal Bellows under Symmetrical Cyclic Tension and Compression Process

et al. 2021

View full text Add to dashboard Cite

The U-shaped metal bellows expansion joint compensates for the pipeline displacement by its own deformation. The compensation performance of the metal bellows in the initial stage of tension and compression deformation is unstable. In this paper, the symmetrical cyclic tension and compression (SCTC) process of metal bellows was simulated by ABAQUS software. Then, the SCTC process experiment of metal bellows was completed on the universal material testing machine. The distribution law of axial load with displacement and that of axial stiffness and yield load with cycles of metal bellows were obtained. Finally, the X-ray diffraction peak confirmed the deformation-induced martensite in the wave trough and proved that the plastic strain and hardness values of metal bellows increased with the displacement amplitude. The microstructure in the wave trough area was observed by a Zeiss microscope, and the stability characteristics mechanism of the metal bellows was revealed. The martensite in the wave trough increases the grain boundary area under SCTC loading. The forward movement of the slip band in the grain caused by large deformation reached an equilibrium state with the resistance at the grain boundary, which promotes the macroscopic mechanical properties of the metal bellows to be stable characteristics under SCTC loading.

show abstract

Section: Finite Element Analysismentioning

confidence: 99%

Stability Characteristics and Mechanism of U-Shaped Metal Bellows under Symmetrical Cyclic Tension and Compression Process

et al. 2021

View full text Add to dashboard Cite

show abstract

“…The improving of the piping systems characteristics and repairing by the suitable patches such as the composite material are among solutions to prevent the propagation of cracks especially the semi-elliptical crack [48,[55][56][57]. In order to improve the mechanical characteristics due to the hydrogenation effect on the API X65 steel pipeline which occurs by transporting hydrocarbons taking into account the operating condition, where A. Magno et al [41,58] enabled to study this phenomenon depending on nature of fluid transported and in the mechanical properties of steel [58].…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the effects of semi-elliptical defects on the API X52 pipeline and its reparation by welding

MESSAOUDI

MERIEM-BENZIANE

2022

JMES

View full text Add to dashboard Cite

The aim of the project is to study experimentally the influence of the semi-elliptical defect on the steel of grade API 5L X52 pipeline and its reparation by welding operation to keep the safety of hydrocarbons transport network. The tests have been performed on the specimens with/without semi-elliptical defects by using two ratios a/c and a/t, where the defects issue on the piping systems wall is treated by using the welding operation, which focuses on the filling the defected surface as same thickness of the base wall of the pipeline after removing the defects. The decrease of ultimate stress is mainly evident depending on the size of crack, where they compared to the base metal results. The experimental results showed that the reliability of the welding operation is proved especially in the ratio a/c =1, which is similar to that found in automatically welded. It is proved that the ratio a/t = 0.2 curve exhibits similarity to the base metal curve and their elongation conforms to API standard of steel X52 grade. Clearly, corrosion defects cause degradation of mechanical property in the order of 44% to 50% depending on the ratio of 0 < a/c ≤1 and from 20% to 80% according to the second ration of 0 < a/t ≤0.8. The obtained results proved that the enhanced of mechanical properties by welding reaches to ultimate stress is 559 MPa for the ratio a/t = 0.2 and 531 MPa for the ratio a/t = 0.5. Finally, the experimental results provided that the impact of semi-elliptical defect has effects on the safety of piping systems where welding became as one of among solutions to repair the piping systems.

show abstract

Fracture Mechanics Based Assessment of a Pressure Vessel Using R6 Procedure

Srinivasan,

Prakashan,

Anandavally Parameswaran

et al. 2023

Trans Indian Inst Met

View full text Add to dashboard Cite

Calculation of SIFs for semi-elliptical surface cracks in U-shaped bellows expansion joints of Es-Salam research reactor vessel

Cited by 6 publications

References 4 publications

Stability Characteristics and Mechanism of U-Shaped Metal Bellows under Symmetrical Cyclic Tension and Compression Process

Stability Characteristics and Mechanism of U-Shaped Metal Bellows under Symmetrical Cyclic Tension and Compression Process

Experimental study of the effects of semi-elliptical defects on the API X52 pipeline and its reparation by welding

Fracture Mechanics Based Assessment of a Pressure Vessel Using R6 Procedure

Contact Info

Product

Resources

About