Stress-concentration coefficients of internal welding defects

Ostsemin, A. A.; Utkin, P. B.

doi:10.3103/s1068798x08120034

Cited by 5 publications

(5 citation statements)

References 2 publications

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“…It is shown that for a spherical imperfection, the stress concentration factor K t can be calculated according to Equation (7) considering the Poisson's ratio ν of the material. Further details to the analytical evaluation of stress concentration coefficients for internal welding defects are provided in [45].…”

Section: Fatigue Assessment Methodsmentioning

confidence: 99%

Fatigue Strength Assessment of Welded Mild Steel Joints Containing Bulk Imperfections

Leitner

Murakami

Farajian

et al. 2018

Metals

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This work investigates the effect of gas pores, as bulk imperfections, on the fatigue strength of welded mild steel joints. Two test series containing different butt joint geometries and weld process parameters are included in order to achieve two variable types of pore sizes. Based on the √ area-parameter by Murakami, the test series can be grouped into imperfections exhibiting √ area < 1000 µm and √ area > 1000 µm. Fatigue tests at a load stress ratio of R = 0.1 are performed, which act as comparison for the subsequent fatigue estimation. To assess the fatigue resistance, the approaches by Murakami, De Kazinczy, and Mitchell are utilized, which highlight certain differences in the applicability depending on the imperfection size. It is found that, on one hand, Murakami's approach is well suitable for both small and large gas pores depending on the applied model parameters. On the other hand, the fatigue concepts by De Kazinczy and Mitchell are preferably practicable for large defects with √ area > 1000 µm. In addition, the method by Mitchell incorporates the stress concentration factor of the imperfection, which can be numerically computed considering the size, shape, and location of the gas pore, as presented in this paper.

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Section: Fatigue Assessment Methodsmentioning

confidence: 99%

Fatigue Strength Assessment of Welded Mild Steel Joints Containing Bulk Imperfections

Leitner

Murakami

Farajian

et al. 2018

Metals

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“…The method is based on the assumption that under static loads in the presence of weld defects sensitive to stress concentrations, fracture of the structure begins near the concentrators for which the stress concentration factor in the elastic region is maximal. For welded vessels and large-diameter pipes containing technological defects with an angle of inclination β = 0 • , using formula (2) for σ θ with θ = 0 • at a distance r = a − d from the tip of the ellipse and performing a number of transformations, we obtain the following expressions for the maximum stress σ max y and the stress concentration coefficient α σ [15] …”

Section: Stress Concentration In the Case Of Internal Technological Dmentioning

confidence: 99%

“…The stress concentration factors α σ , calculated by formula (18) for a crack, incomplete fusion, and a lack of fusion for various values of m are given in the table [15].…”

Section: Stress Concentration In the Case Of Internal Technological Dmentioning

confidence: 99%

“…The values of K I are calculated by approximate formulas with an accuracy of 9.1% [6]. Figure 5 shows experimental values of the principal stresses σ 1 and σ 2 obtained using formulas (15) and the values of σ 1 and σ 2 calculated by formulas (16). From Fig.…”

Section: Experimental Determination Of the Principal Stress σ 1 In Thmentioning

confidence: 99%

“…Using formula (15) for the principal stresses, we obtained the following formulas for the stress intensity σ i and the rigidity of the stress state σ 1 /σ i by APD patterns [12]:…”

Section: Experimental Determination Of the Principal Stress σ 1 In Thmentioning

confidence: 99%

See 2 more Smart Citations

Stress-strain state of an inclined elliptical defect in a plate under biaxial loading

Ostsemin¹,

Utkin

2012

J Appl Mech Tech Phy

Self Cite

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A mathematical model for the stress-strain state of a plate with an inclined elliptical defect under biaxial loading is considered. Exact formulas for stresses in polar coordinates, displacements, principal stresses, maximum shear stress, and stress intensity in the case of a plane stress state of the plate were obtained by the Kolosov-Muskhelishvili method. Simulation results are compared with experimental data obtained by holographic interferometry.

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A two-scale approach for assessing the role of defects in fatigue crack nucleation in metallic structures

Khan,

Leonetti,

Kouznetsova

et al. 2024

International Journal of Fatigue

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Stress-concentration coefficients of internal welding defects

Cited by 5 publications

References 2 publications

Fatigue Strength Assessment of Welded Mild Steel Joints Containing Bulk Imperfections

Fatigue Strength Assessment of Welded Mild Steel Joints Containing Bulk Imperfections

Stress-strain state of an inclined elliptical defect in a plate under biaxial loading

A two-scale approach for assessing the role of defects in fatigue crack nucleation in metallic structures

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