INFLUENCE OF ROLLING DIRECTION IN CALCULATION OF RESIDUAL STRESS BY USING DCP METHOD IN NAVAL WELDED SHEETS
Catarina Esposito Mendes1; Ricardo Artur Sanguinett Ferreira1; Leonardo Gadelha Tumajan Costa de Melo1; Paternak de Souza Barros1; Israel Lira Gonçalves1; Tiago Leite Rolim1; Yogendra Prasad Yadava1; Euclides Apolinário Cabral de Pina1
1 Universidade Federal de Pernambuco
doi:10.20906/CPS/COB-2015-0311
Resumo
Rolling processes introduce residual stress due to uneven plastic deformation, in which stress distribution at the sheet are of compressive nature on the surface and tractive in the center line. Residual stress are important for welded components structural integrity. In order to determine residual stress in welded joins of naval sheets from MAG process with different rolling direction, a displacements of coordinated points method was used, which preliminary results have shown a good correlation with the results obtained by traditional Xray diffraction method. Average difference between the mapped points' centers of the welded sheets with welding bead in rolling direction was of 0.007 mm in X direction and 0.011 mm in Y, and average residual stress was of 63.303 MPa. Average difference of the centers in transverse direction was of 0.015 mm in x and 0.011 mm in y, and average residual stress was of 141.360 MPa. This difference is explained by Bauschinger effect (1886), in which anisotropy is explained by predeformation.
Palavras-chave: residual stress; anisotropy; Bauschinger effect; Rolling process