PSI - Issue 17

J. Zhu et al. / Procedia Structural Integrity 17 (2019) 704–711

711

Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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Conclusion

1. The prescribed temperature method can reduce the computational time by 80% as compared to the Thermo elastic-plastic method. Furthermore, the computational time for using lumping method, together with prescribed temperature method is 65% less than the prescribed temperature method. However, the magnitude of residual stresses may be underestimated. 2. According to the residual stress state along the crack path, it is found that the residual stresses near both weld toe and root side are compressive which contribute to the closure of the crack. However, the residual stresses in the center of the weld are tensile with the magnitude up to 820 MPa which contribute to the opening of the crack. 3. It is shown that the estimated residual stresses from the cases of welds with full penetration and partial penetration are slightly different. 4. A similar trend of the residual stress state in front of the weld toe is observed in the experimental measurements using X-ray diffraction technique and simulations using lumping method, together with prescribed temperature method.

Acknowledgements

The members of the project Reduced variation in the manufacturing processes enabling lightweight welded structures VariLight (Sweden’ s Innovation Agency VINNOVA, Grant Number 2016-03363) is gratefully acknowledged for their support. Schlumpf Scandinavia AB and Stresstech Oy are thanked for their help in making residual stresses measurement in welded box structures. ESI Group is acknowledged for their support in the software SYSWELD.

References

Feng, Z. ed., 2005. Processes and mechanisms of welding residual stress and distortion. Elsevier, pp. 3. Long, H., Gery, D., Carlier, A. and Maropoulos, P.G., 2009. Prediction of welding distortion in butt joint of thin plates. Materials & Design, 30(10), pp.4126-4135. Teng, T.L., Fung, C.P., Chang, P.H. and Yang, W.C., 2001. Analysis of residual stresses and distortions in T-joint fillet welds. International Journal of Pressure Vessels and Piping, 78(8), pp.523-538. Schenk, T., Richardson, I.M., Kraska, M. and Ohnimus, S., 2009. Modeling buckling distortion of DP600 overlap joints due to gas metal arc welding and the influence of the mesh density. Computational Materials Science, 46(4), pp.977-986. Lindgren, L.E., Runnemalm, H. and Näsström, M.O., 1999. Simulation of multipass welding of a thick plate. International journal for numerical methods in engineering, 44(9), pp.1301-1316. Yang, Y.P., Brust, F.W. and Kennedy, J.C., 2002, January. Lump-pass welding simulation technology development for shipbuilding applications. In ASME 2002 Pressure Vessels and Piping Conference (pp. 47-54). American Society of Mechanical Engineers. Khurram, A. and Shehzad, K., 2012. FE simulation of welding distortion and residual stresses in butt joint using inherent strain. International Journal of Applied Physics and Mathematics, 2(6), p.405. Zhu, J., Khurshid, M. and Barsoum, Z., 2019. Accuracy of computational welding mechanics methods for estimation of angular distortion and residual stresses. Welding in the World, DOI: 10.1007/s40194-019-00746-9. Bhatti, A.A., Barsoum, Z., Murakawa, H. and Barsoum, I., 2015. Influence of thermo-mechanical material properties of different steel grades on welding residual stresses and angular distortion. Materials & Design (1980-2015), 65, pp.878-889. Goldak, J., Chakravarti, A. and Bibby, M., 1984. A new finite element model for welding heat sources. Metallurgical transactions B, 15(2), pp.299 305. Rhouma, A.B., Sidhom, H., Braham, C., Lédion, J. and Fitzpatrick, M.E., 2001. Effects of surface preparation on pitting resistance, residual stress, and stress corrosion cracking in austenitic stainless steels. Journal of materials engineering and performance, 10(5), pp.507-514. Sandberg, D., Mansour, R., and Olsson, M., 2017. Fatigue probability assessment including aleatory and epistemic uncertainty with application to gas turbine compressor blades. International Journal of Fatigue, 95, 132-142. Barsoum, Z., 2007. Residual stress prediction and relaxation in welded tubular joint. Welding in the World, 51(1-2), pp.23-30. Lindgren, L.E., 2001. Finite element modeling and simulation of welding part 1: increased complexity. Journal of thermal stresses, 24(2), pp.141 192.