Evaluation of welded cast steel joint fatigue data using structural stress methods

Wei, Zezhong; Pei, Xianjun; Jin, Hui

doi:10.1016/j.jcsr.2021.106895

Cited by 13 publications

(6 citation statements)

References 37 publications

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“…After comparison, the researchers chose the three-dimensional solid element Solid65 from the ANSYS element type library. The element type has a quadratic displacement and is suitable for irregular grid division [27][28][29][30]. Figure 7c shows the joint finite element mesh.…”

Section: Establish Modelmentioning

confidence: 99%

Study on failure modes and calculation method of the cast steel joint with branches in treelike structure

Chen,

Sun,

Sun

et al. 2024

Archives of Civil Engineering

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The treelike structure links members and transfers loads via its solitary cast steel joint with branches. Therefore, the joint’s bearing capacity significantly affects the treelike structure’s stability, security, and economics. This paper utilized experimental verification and numerical modeling to examine the mechanical behavior of cast-steel joints with branches in the treelike structure under various loading conditions. Then, researchers investigated the failure process and mechanism of joints, and the three most common failure modes were outlined. Furthermore, the researchers proposed the bearing capacity calculation formula based on the common failure modes. The results show that the three common failure modes of the cast-steel joints with branches under different loading conditions are the failure in the joint core area under the axial load, the failure in the main pipe compression side under eccentric load, and the failure in the compression side of the single branch pipe root when the single branch pipe is under the uneven load. The suggested empirical calculation method can serve as a reference point for similar engineering practices design.

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Section: Establish Modelmentioning

confidence: 99%

Study on failure modes and calculation method of the cast steel joint with branches in treelike structure

Chen,

Sun,

Sun

et al. 2024

Archives of Civil Engineering

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“…25 Xiao and Yamada 26 extracted the stress 1 mm below the weld notch to characterize the welded joint fatigue behavior, which performs well in correlating weld fatigue data of various thicknesses. 27 Tovo and Lazzarin calculated the notch stress intensity factor (N-SIF) by post-processing the FE results and derived a fatigue design curve based on hundreds of fatigue tests. 28,29 Researchers also draw the relationship between the N-SIF and the strain energy density (SED), which is easier to compute.…”

Section: Introductionmentioning

confidence: 99%

“…30 The method has been adopted in ASME Standards 31 and widely utilized in the fatigue evaluation of steel bridges, pressure vessels, pipe structures, and transportation. 1,27,[31][32][33][34][35][36][37] Deng et al also applied a similar concept to assess the HFMI effect of a welded T-joint. 37 All the aforementioned methods are stress-based, aiming for the HCF of welded joints.…”

Section: Introductionmentioning

confidence: 99%

“…Leitner et al assessed the high‐frequency mechanical impact (HFMI) effect on welded joints using the notch stress/strain method 25 . Xiao and Yamada 26 extracted the stress 1 mm below the weld notch to characterize the welded joint fatigue behavior, which performs well in correlating weld fatigue data of various thicknesses 27 . Tovo and Lazzarin calculated the notch stress intensity factor (N‐SIF) by post‐processing the FE results and derived a fatigue design curve based on hundreds of fatigue tests 28,29 .…”

Section: Introductionmentioning

confidence: 99%

“…The method performs a free‐body cut on the hypothetical crack plane, which collapses tones of fatigue data of various joint classifications into one master S – N curve 30 . The method has been adopted in ASME Standards 31 and widely utilized in the fatigue evaluation of steel bridges, pressure vessels, pipe structures, and transportation 1,27,31–37 . Deng et al also applied a similar concept to assess the HFMI effect of a welded T‐joint 37 …”

Section: Introductionmentioning

confidence: 99%

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A post‐processing procedure for predicting high‐ and low‐cycle fatigue life of welded structures based on the master E–N curve

Liu

Lei

Xing

et al. 2023

Fatigue Fract Eng Mat Struct

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This work provides a post‐processing procedure to predict the high‐ and low‐cycle fatigue life of welded structures. The post‐processor calculates the equivalent structural strain range, given the traction stress state at the weld notch, by enforcing the equilibrium condition and Navier's hypothesis. The return mapping algorithm is applied to deal with the low‐cycle fatigue condition in which through‐thickness plastic deformation develops. The proposed method predicts the fatigue life of 793 welded joints of different configurations made from steel, magnesium, titanium, and aluminum alloy. The predicted high‐ and low‐cycle fatigue lives agree equally well with the experimental result.

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Fatigue design of stress relief grooves to prevent weld root fatigue in butt-welded cast steel to ultra-high-strength steel joints

Havia,

Lipiäinen,

Ahola

et al. 2024

Weld World

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In the welded joints, fatigue failures typically originate from defects or notch-like geometries under cyclic loading. This study investigates the impact of stress relief grooves (SRG) on the fatigue performance of butt-welded cast steel to ultra-high-strength steel components using experimental fatigue tests and finite element method. The experiments examined the fatigue properties of hybrid joints between G26CrMo4 cast steel (t = 20 mm) and S960 steel plate (t = 6 mm) with and without SRG. Gas metal arc welding process was used to weld the butt joints that had a permanent root backing machined on the cast steel part, causing a crack-like defect to the weld root. Additionally, the top surfaces of the welded parts were aligned, resulting in a significant axial misalignment in the butt joint. The SRG, positioned close to the weld root, was found to have a beneficial influence on the joint’s fatigue performance by a factor of 1.2 when using the nominal stress criterion. However, the fatigue capacity was still roughly 35% lower compared to the symmetrical equivalent due to the secondary bending stress, caused by axial misalignment. The finite element analyses indicated that the SRG reduces the amount of secondary stresses at the weld root leading to lower total structural stress. The study recommends using the FAT80 (m = 3) design curve in the structural stress method, for similar butt-welds having a crack-like defect, parallel to the loading direction, at the weld root. However, for welded joints with crack-like defects, it is advisable to use linear elastic fracture mechanics rather than relying solely on stress-based local approaches.

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Evaluation of welded cast steel joint fatigue data using structural stress methods

Cited by 13 publications

References 37 publications

Study on failure modes and calculation method of the cast steel joint with branches in treelike structure

Study on failure modes and calculation method of the cast steel joint with branches in treelike structure

A post‐processing procedure for predicting high‐ and low‐cycle fatigue life of welded structures based on the master E–N curve

Fatigue design of stress relief grooves to prevent weld root fatigue in butt-welded cast steel to ultra-high-strength steel joints

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