Simplified approach to fatigue strength assessment of fillet-welded attachment ends

Fricke, Wolfgang; Doerk, Olaf

doi:10.1016/j.ijfatigue.2005.04.008

Cited by 28 publications

(24 citation statements)

References 8 publications

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“…However, the highest peak stress exists at the toe in the notch area, where the stress analysis would anticipate the point of crack initiation. Indeed, that was the main crack initiation location in stress‐relieved joints . Conversely, in as‐welded specimens, crack initiation at the toe close to the rounded notch was delayed by the compressive residual stresses existing there.…”

Section: Joint Geometries and Stress Analysis Using The Peak Stress Mmentioning

confidence: 95%

“…The mesh of the submodel was generated using the mapped meshing approach applied directly to the 3D geometry of the model, according to the procedure described for the tubular joint tested by Meneghetti Notched transverse attachment type A …”

Section: Joint Geometries and Stress Analysis Using The Peak Stress Mmentioning

confidence: 99%

“…Fricke et al . tested 12‐mm‐thick transverse load‐carrying fillet‐welded attachments in structural steel subject to pulsating ( R ≅ 0) tension loading . In the original paper, both as‐welded and stress‐relieved specimens were tested; however, only as‐welded experimental data were considered in the present paper.…”

Section: Joint Geometries and Stress Analysis Using The Peak Stress Mmentioning

confidence: 99%

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The peak stress method combined with 3D finite element models for fatigue assessment of toe and root cracking in steel welded joints subjected to axial or bending loading

Meneghetti

Guzzella

Atzori

2014

Fatigue Fract Eng Mat Struct

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In fatigue design of welded joints, the local approach based on the notch stress intensity\ud factor (NSIF) assumes that the weld toe profile is a sharp V-notch having a tip radius\ud equal to zero, while the root side is a pre-crack in the structure. The ratio between the\ud mode I NSIF and the linear elastic opening peak stress evaluated at the point of singularity\ud (i.e. the V-notch tip) by the finite element (FE) method depends only on the type and\ud size of the elements adopted in the discretization. The ratio between the mode II SIF and\ud the linear elastic sliding peak stress evaluated at the crack tip has the same property. This\ud useful property of the opening and sliding peak stresses evaluated by the FE method gives\ud rise to the so-called peak stress method (PSM). In the present paper, it is adopted as an\ud engineering, FE oriented application of the NSIF approach to fatigue design of welded\ud joints. Originally applied to 2D FE models, the peak stress method is combined here with\ud 3D numerical models to assess the fatigue strength of steel welded joints having complex\ud geometry and characterised by toe as well as root cracking. A properly defined design\ud stress, that is, the equivalent peak stress, is shown to correlate with good approximation\ud all analysed experimental data

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Section: Joint Geometries and Stress Analysis Using The Peak Stress Mmentioning

confidence: 95%

Section: Joint Geometries and Stress Analysis Using The Peak Stress Mmentioning

confidence: 99%

Section: Joint Geometries and Stress Analysis Using The Peak Stress Mmentioning

confidence: 99%

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The peak stress method combined with 3D finite element models for fatigue assessment of toe and root cracking in steel welded joints subjected to axial or bending loading

Meneghetti

Guzzella

Atzori

2014

Fatigue Fract Eng Mat Struct

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“…Fatigue of fillet welds based on structural stresses (SSs) was addressed by Fricke (2006) and Fricke and Doerk (2006). The papers address practical approaches for typical problems encountered.…”

Section: Fpsosmentioning

confidence: 99%

Recent structural design considerations related to floating production systems

Leira

2010

The IES Journal Part A: Civil & Structural Engineering

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Recent studies related to structural design of floating production systems are reviewed. The following topics are considered: (i) Hurricane effects and other extreme environmental events, (ii) Design for arctic conditions, (iii) Application of models tests for design purposes and (iv) Design considerations for particular floating production systems such as spars, tension leg platforms, FPSOs and semisubmersible platforms.

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“…Il problema delle singolarità tensionali nella progettazione a fatica, in questo articolo, è stato risolto proponendo una filosofia di progettazione basata sui metodi a gradiente implicito capaci di rendere continui i campi di tensione singolari indotti dalla presenza di intagli a spigolo vivo. Tali metodi hanno il vantaggio di poter considerare il materiale come lineare U  4 cicli a rottura N R=-1 t=12 mm [25] R= 0 (as-welded) elastico trasformando il problema del gradiente tensionale nella risoluzione di una equazione differenziale definita sull'intero corpo in esame. La soluzione trovata, definita come tensione equivalente non locale assume il ruolo di tensione efficace per la valutazione della vita a fatica.…”

Section: Conclusioniunclassified

Il gradiente implicito nella verifica a fatica di giunzioni saldate sollecitate a fatica

Tovo

Livieri

2009

Frattura Ed Integrità Strutturale

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RIASSUNTO. L'incremento delle potenzialità di strumenti per la progettazione assistita (come modellatori solidi e strumenti per FEA in grado di gestire modelli molto complessi) permette di ipotizzare lo sviluppo di strumenti numerici specifici per la previsione della resistenza a fatica delle giunzioni saldate. Tali strumenti potrebbero essere in grado di valutare l'influenza di geometria e carichi senza la necessità di elaborazioni successive, e spesso, del progettista (come nelle tensioni di Hot Spot). Il presente lavoro propone una metodologia di calcolo adatta alla previsione della vita a fatica di giunzioni saldate complesse. Un indice di resistenza è ottenuto innanzitutto risolvendo il problema tensionale completamente in modo numerico (agli elementi finiti) . La previsione della resistenza a fatica, è calcolata facendo uso di un modello analitico basato sul gradiente implicito che assume come tensione efficace la tensione equivalente non locale derivante dalla tensione principale. Dapprima verrà tarato il metodo su prove sperimentali eseguite su giunzioni saldate a croce, successivamente il metodo verrà utilizzato per la verifica a fatica di giunzioni saldate più complesse a sviluppo tridimensionale.ABSTRACT. In this paper, a non-local equivalent stress is calculated by solving a second order differential equation of implicit type. The solution is obtained by assuming a linear elastic constitutive behaviour and the maximum principal stress as equivalent stress. Fatigue behaviour of steel welded joints is taken into account and a general fatigue scatter band is proposed. The non local stress is computed, namely the effective stress, by means of a completely numerical solution of local elastic stress field. In complex 3D welded details the critical point turns out from the analysis and it is not assumed a priori. PAROLE CHIAVE. Fatica, giunti saldati, tensioni non-locali. INTRODUZIONE

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Simplified approach to fatigue strength assessment of fillet-welded attachment ends

Cited by 28 publications

References 8 publications

The peak stress method combined with 3D finite element models for fatigue assessment of toe and root cracking in steel welded joints subjected to axial or bending loading

The peak stress method combined with 3D finite element models for fatigue assessment of toe and root cracking in steel welded joints subjected to axial or bending loading

Recent structural design considerations related to floating production systems

Il gradiente implicito nella verifica a fatica di giunzioni saldate sollecitate a fatica

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