Comparative study on numerical simulation methods of stress concentration calculation and fatigue life prediction for welds

He, Zhengping; Chen, Bingzhi; Li, Xiangwei

doi:10.1016/j.ijfatigue.2022.107205

Cited by 14 publications

(7 citation statements)

References 19 publications

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“…By introducing a circle with a radius of 1 mm at the weld toe and weld root of the welded joint, the effective notch stress can be obtained. This approach has been incorporated into the IIW standards (He et al, 2023). The IIW standard stipulates that for welded joints with a plate thickness greater than 5 mm, a virtual notch radius ρ f 5 1 mm should be adopted (Jonsson and Samuelsson, 2008).…”

Section: Fatigue Curve Fitting Methodsmentioning

confidence: 99%

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Research on fatigue curve fitting methods based on the notch stress approach

Xue,

He,

Chen

et al. 2024

IJSI

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PurposeThis study investigates the fitting techniques for notch fatigue curves, seeking a more reliable method to predict the lifespan of welded structures.Design/methodology/approachBuilding on the fatigue test results of butt and cruciform joints, this research delves into the selection of fitting methods for the notch fatigue curve of welded joints. Both empirical formula and finite element methods (FEMs) were employed to assess the notch stress concentration factor at the toe and root of the two types of welded joints. Considering the mean stress correction and weld misalignment coefficients, the notch fatigue life curves were established using both direct and indirect methods.FindingsAn engineering example was employed to discern the differences between the direct and indirect approaches. The findings highlight the enhanced reliability of the indirect method for fitting the fatigue life curve.Originality/valueWhile the notch stress approach is extensively adopted due to its accurate prediction of component fatigue life, most scholars have overlooked the importance of its curve fitting methods. Existing literature scantily addresses the establishment of these curves. This paper offers a focused examination of fatigue curve fitting techniques, delivering valuable perspectives on method selection.

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Section: Fatigue Curve Fitting Methodsmentioning

confidence: 99%

Section: Effective Notch Stress Methodsmentioning

confidence: 99%

Research on fatigue curve fitting methods based on the notch stress approach

Xue,

He,

Chen

et al. 2024

IJSI

Self Cite

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“…Four different survival rate fatigue test results (137.02 MPa, 16,940,11,488,10,292,8373) are used as reference points to analyze the relative error between the life predicted by the equivalent crack life prediction method and the life fitted based on the experimental data under different reliability. According to the equivalent crack life prediction method, the fatigue life N f_pre under different load levels was calculated using the fatigue test results of the above four survival rates as reference points.…”

Section: Comparison and Verification Of Constant Amplitude Load Fatig...mentioning

confidence: 99%

“…The equivalent notch stress‐based method needs to have corresponding notch stress concentration factors for fillet welds and dimensional criteria 9 . The fracture mechanics method requires considering defect randomness, weld residual stress redistribution, and crack growth rate 10,11 . Kang et al and Dong et al 12,13 proposed the structural stress method with the principal S‐N curve, which effectively solved the problems of mesh sensitivity and difficult S‐N curve selection in finite element analysis of welds.…”

Section: Introductionmentioning

confidence: 99%

“…9 The fracture mechanics method requires considering defect randomness, weld residual stress redistribution, and crack growth rate. 10,11 Kang et al and Dong et al 12,13 proposed the structural stress method with the principal S-N curve, which effectively solved the problems of mesh sensitivity and difficult S-N curve selection in finite element analysis of welds. Recently, related scholars [14][15][16] proposed an analytical solution to determine the weld toe and root cracking of weld root traction stresses in load-bearing welded cruciform joints and proposed fatigue design recommendations for the joints.…”

Section: Introductionmentioning

confidence: 99%

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Fatigue life prediction of aluminum alloy T‐welded joints root failure based on equivalent crack method

Wang

Yang

Zhu

et al. 2023

Fatigue Fract Eng Mat Struct

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This study proposes an equivalent crack life prediction method for root cracks in T‐welded joints. An equivalent initial defect is used to describe the severity of the weld defect. Fatigue life prediction is achieved based on equivalent fracture parameters and high‐stress fatigue life reference points fitted to obtain a P‐S‐N curve for the entire stress range. Taking the 6082‐aluminum alloy T‐welded joints as the object, the test data under tensile load P‐S‐N curve fitting and crack growth simulation were carried out to compare and verify the applicability under constant and equivalent spectral load. This method enables deterministic fatigue life prediction with less testing and cost. Meanwhile, the approach incorporates the uncertainty of the physical model of the weld into the P‐S‐N curve, simplifying the process of calculating the probabilistic fatigue life.

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Multi‐objective stiffness and mass optimization of bio‐inspired hierarchical grid‐honeycomb sandwich structures with cutouts considering buckling constraints

Lv,

Shi,

Chen

et al. 2024

Polymer Composites

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The engineering structures with cutouts should consider both buckling and stiffness. Inspired by the multi‐level leaf veins, in this paper, the skeleton of the grid‐honeycomb sandwich structure was designed in the hierarchical form, and combined with the cutout characteristics of the side walls of the railway vehicle body, the multi‐objective stiffness and mass optimization of the skeleton layout under buckling constraints was achieved. The cutout honeycomb sandwich structure was designed with orthogonal grids in the stiffness design area and curved grids based on the quadratic polynomial in the buckling design area. The optimization model also included the linear angle hierarchical grid, the constant angle hierarchical grid, and the single‐level orthogonal grid. The multi‐objective optimization framework based on the Radial Basis Function (RBF) surrogate model and the Non‐dominated Sorting Genetic Algorithm (NSGA‐II) was developed. The optimization results indicated that the hierarchical grid provided the more extensive design space. The optimal solution of the quadratic polynomial hierarchical grid had the highest stiffness and stiffness per unit mass compared to the rest of the grid layouts, which were 23.28% and 30.47% higher than the single‐level orthogonal grid, respectively. Finally, the multi‐order eigenvalue buckling was analyzed based on the optimal structure.Highlights Layout of hierarchical grids proposed inspired by multi‐level leaf veins. Orthogonal grids ensure stiffness and curved grids inhibit buckling at cutouts. Apply the hierarchical grids as skeletons to honeycomb sandwich structures. Stiffness and mass optimization subject to buckling constraints is performed.

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Comparative study on numerical simulation methods of stress concentration calculation and fatigue life prediction for welds

Cited by 14 publications

References 19 publications

Research on fatigue curve fitting methods based on the notch stress approach

Research on fatigue curve fitting methods based on the notch stress approach

Fatigue life prediction of aluminum alloy T‐welded joints root failure based on equivalent crack method

Multi‐objective stiffness and mass optimization of bio‐inspired hierarchical grid‐honeycomb sandwich structures with cutouts considering buckling constraints

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