Imperfections generation in finite element models of welding

Autor(es)

Novotny, Ladislav ^[1] ; de Abreu, Hamilton Ferreira Gomes ^[2] ; Zajac, Jozef ^[1] ; Beres, Miloslav ^[3]

Afiliação do(s) autor(es)

^[1] Tech Univ Kosice, Dept Comp Aided Mfg Technol, Bayerova 1, Presov 08001 - Slovakia

^[2] Univ Fed Ceara, Dept Met & Mat Engn, Fortaleza, Ceara - Brazil

^[3] Univ Estadual Campinas, Fac Chem Engn, Natl Inst Biofabricat, Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: SCIENCE AND TECHNOLOGY OF WELDING AND JOINING; v. 23, n. 2, p. 148-157, 2018.
• Citações Web of Science: 0

Resumo

Welded components contain certain geometrical imperfections which may affect buckling behaviour of the final product. However, geometrical perfect models are usually used in the finite element method simulation. When a simple weld model is used, the mode of the end-distortion is predictable. Imperfections are created in the same shape as predicted. This paper presents a novel numerical approach on how to generate geometrical imperfections in finite element models. In this approach, as first, a large temperature gradient for the weld seam elements is prescribed. Then a linear steady-state thermal analysis is conducted and is followed by a structural analysis to determine the initial stress stiffness matrix for an eigenvalue analysis. The mode shapes of eigenvalue analysis are finally used to generate the imperfections. The results obtained in the course of this work allowed to calculate resultant welding distortion more accurate. (AU)

• Processo FAPESP: 16/09350-2 - Desenvolvimento de implantes customizados em biomateriais metálicos utilizando sinterização direta de metais por laser
• Beneficiário: Rubens Maciel Filho
• Linha de fomento: Auxílio à Pesquisa - Pesquisador Visitante - Internacional