Practical methodology to evaluate the fatigue life of seam welded joints

• Autorzy: Goes K. C. , Batalha G. F. , Pereira M. V. , Camarao A. F.
• Języki publikacji: EN

Abstrakty

EN

Purpose: of this paper is to present a practical and robust methodology developed to evaluate the fatigue life of seam welded joints under combined cyclic loading. Design/methodology/approach: Fatigue analysis was conducted in virtual environment. The finite element stress results from each loading were imported to fatigue code FE-Fatigue and combined to perform the fatigue life prediction using the S x N (stress x life) method. A tube-to-plate specimen was submitted to a combined cyclic loading (bending and torsion) with constant amplitude. The virtual durability analysis result was calibrated based on these laboratory tests and design codes such as BS7608 and Eurocode 3. The feasibility and application of the proposed numerical-experimental methodology and contributions for the technical development are discussed. Major challenges associated with this modelling and improvement proposals are finally presented. Findings: The finite element model was validated due to laboratory results. The analytical stress result presented upper value due to the approach used that considered the fillet weld supported all work. The model presented a good representation of failure and load correlation. Research limitations/implications: The measurement or modelling of the residual stresses resulting from the welding process was not included in this work. However, the thermal and metallurgical effects, such as distortions and residual stresses, were considered indirectly with regard to the corrections performed in the fatigue curves obtained from the investigated samples. Practical implications: Integrating fatigue analysis and finite elements, it is possible to analyse several welded joint configurations in the design phase, providing development time and cost reduction, increasing the project reliability. Originality/value: This methodology will permit, in further studies, the modelling of both stresses, in-service and residual stresses, acting together, which seem like an advantage to engineers and researchers who work in design and evaluation of structural components against fatigue failures.

Słowa kluczowe

EN

fatigue; combined loading; finite element analysis; welding

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2011
• Tom: Vol. 49, nr 1
• Strony: 35--41
• Opis fizyczny: Bibliogr. 21 poz., rys., tab.

Twórcy

autor

Goes K. C.

• PETROBRAS - Petróleo Brasileiro, Av. Republica do Chile 65, Rio de Janeiro, RJ, Brazil

autor

Batalha G. F.

• University of Sao Paulo - Escola Politecnica POLI-USP, Av. Prof. Mello Moraes 2231, São Paulo, SP, Brazil

autor

Pereira M. V.

• Catholic University of Rio de Janeiro - PUC-RJ, Rua Marquês de Sao Vicente 225, Rio de Janeiro, RJ, Brazil

autor

Camarao A. F.

• Meritor do Brasil Sistemas Automotivos Ltda, Av. Joao Batista 825, Osasco, SP, Brazil

Bibliografia

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• [19] K.C. Goes, G.F. Batalha, A.F. Camarao, Finite element modeling techniques of 3D welded joints - the structural hot spot approach, Proceedings of the 20th International Congress of Mechanical Engineering, Gramado, 1 (2009) 1-10.
• [20] K.C. Goes, G.F. Batalha, A.F. Camarao, A fatigue analysis model of welded joints within finite element environment, Proceedings of the IIW International Congress / 2nd Latin American Welding Congress / XXXIV CONSOLDA, Sao Paulo, 2008, 1-10 (CD-ROM).
• [21] K.C. Goes, A Model for fatigue life prediction of weldment joints submitted to combined loadings, MSc Thesis, University of Sao Paulo, Brazil, 2010, http://www.teses.usp.br/teses/disponiveis/3/3151/tde20082-152344/ (in Portuguese