Numerical and experimental validation of residual stresses of laser‐welded joints and their influence on the fatigue behaviour

Sepe, Raffaele; Wiebesiek, J.; Sonsino, Cetin Morris

doi:10.1111/ffe.13180

Cited by 26 publications

(10 citation statements)

References 56 publications

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“…However, as is well‐known, the fatigue strength of a welded component in presence of multiaxial cyclic loading is significantly lower than that of an unwelded one (even if the components are made of the same material) 2 . In particular, the factors causing the above strength reduction 3–5 are residual stresses, 6–9 thermal distortions, 10 defects caused by partial penetration, 11 and material microstructural imperfections 12 …”

Section: Introductionmentioning

confidence: 99%

A frequency‐domain approach for damage detection in welded structures

Ronchei

Vantadori

Carpinteri

et al. 2021

Fatigue Fract Eng Mat Struct

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The goal of the present paper is to apply a multiaxial fatigue criterion, formulated in frequency‐domain, to welded components. In particular, the proposed procedure requires (i) to evaluate the stress field at the so‐called hotspot and (ii) to compute the fatigue damage. A case study, represented by fillet‐welded tubular T‐joints under random loading, is examined to assess the validity of the above procedure in estimating the crack nucleation position. Finally, the above theoretical results are also compared with those derived by means of a similar procedure, which has recently been proposed by some of the present authors, but formulated in time‐domain.

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Section: Introductionmentioning

confidence: 99%

A frequency‐domain approach for damage detection in welded structures

Ronchei

Vantadori

Carpinteri

et al. 2021

Fatigue Fract Eng Mat Struct

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“…In such cases cyclic plastic zone may serve as a proper parameter to determine more accurate predictions of fatigue life [19]. Influence of residual stresses on fatigue initiation period based on local approach was described in References [3,20,21]. Livieri and Lazzarin Reference [22] proposed a method for the assessment of fatigue strength of welded joints based on generalized tress intensity factors applicable to sharp v-notches.…”

Section: Introductionmentioning

confidence: 99%

Stress Concentration Factors for Butt-Welded Plates Subjected to Tensile, Bending and Shearing Loads

Molski

2020

Materials

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This paper deals with the analysis of stress concentration at the weld toe of a Double-V and a Single-V butt-welded joints subjected to tensile, bending and shearing loads. For each geometrical and loading case accurate close form stress concentration factor formula based on more than 3.3 thousand finite element method solutions were obtained. The percentage error of the formulas is lower than 2.5% for a wide range of values of geometrical parameters including weld toe radius, weld width, plate thickness and weld toe angle. The limiting case, in which the weld toe radius tends to zero is also considered. In the cases of shearing loads, a plane model based on thermal analogy was developed. The whole analysis was performed assuming that a circular arc represents the shape of the excess weld metal. Presented solutions may be used in computer aided fatigue assessment of structural elements.

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“…Usually, the researchers mainly focus on the single weld joints in the laboratory [ 5 ], which is independent of the complex structure. However, the weld joints are exposed to more complicated conditions, e.g., the combination of weld residual stress [ 6 , 7 ], the thermal stress [ 8 ], the external loads [ 7 , 9 ], post-weld heat treatment [ 7 ], etc. Those studies are bound to show different fatigue failure mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Life Assessment of the Shell Structure of Purified Terephthalic Acid Filter Press

et al. 2020

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The filter press is one of the most important devices in purified terephthalic acid (PTA) refinement, and it is of great significance to ensure the fatigue strength of the structure in operation. In this study, the fatigue life prediction of the shell structure of the PTA filter press was investigated through numerical and experimental methods. Firstly, the accurate stress at the critical area of the stiffener was obtained based on the thermomechanical model and submodel approach proposed. Subsequently, the fatigue life was evaluated by the fatigue strength reduction method and hot spot stress method. Finally, the shell structure is optimized by increasing the size of the axial stiffener and continuous hoop stiffener. The results unveil that both thermal load and outer structure constraints have little effect on the radial displacement and stress amplitude of the shell structure. Through modifying the fatigue design curve of the fatigue strength reduction method, the shell structure of the PTA filter press has 42.0% and 0.3% failure probabilities in the previous and present cyclic pressure conditions. Furthermore, the hoop stiffener plays an important role in reducing radial displacement and stress amplitude, among which three hoop stiffeners exhibit the most satisfactory optimization.

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Numerical and experimental validation of residual stresses of laser‐welded joints and their influence on the fatigue behaviour

Cited by 26 publications

References 56 publications

A frequency‐domain approach for damage detection in welded structures

A frequency‐domain approach for damage detection in welded structures

Stress Concentration Factors for Butt-Welded Plates Subjected to Tensile, Bending and Shearing Loads

Fatigue Life Assessment of the Shell Structure of Purified Terephthalic Acid Filter Press

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