The Influence of Modelling Material Zones on Strains and Stresses at Weld Toe Notch

Abstract:

The latest development in the field of welding technology enabled prefabrication of thinwalled sandwich structures in an industrial scale. Sandwich structures fabricated of steel, or aluminium alloy plates and stiffeners are welded with the use of hipower CO₂ lasers. Strength analysis of such structures with the use of finite element method needs proper material modelling. In this paper the material model of steel sandwich panel tee-joint is analysed. The influence of including different material zones on strains and stresses at the weld notch area is presented. The analysis shows that material changes outside the weld notch area do not influence the results of strains and stresses. The impact of the geometrical notch is very local and it does not interfere with material property changes at neighbouring weld zones. For the purpose of determination of maximum values of stresses and strains at weld toe notch, the analysed laser weld can be modelled with the use of one material property for all weld zones.

• Periodical: Solid State Phenomena (Volume 224)
• Pages: 187-191
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.224.187
• Online since: November 2014
• Authors: Karol Niklas*, Janusz Kozak
• Keywords: Fatigue, FEA, FEM, Laser Welds, Material Model

References

[1] Kozak J., Research on deformations of laser-welded joint of a steel sandwich structure model, Polish Maritime Research nr 2(40) vol. 11, (2004).

[2] Niklas K., Calculations of notch stress factor of a thin-walled spreader bracket fillet weld with the use of a local stress approach, Engineering Failure Analysis, vol. 45, p.326.

DOI: 10.1016/j.engfailanal.2014.06.017

[3] Niklas K., Kozak J., Influence of the Notch Rounding Radius on Estimating the Elastic Notch Stress Concentration Factor in a Laser Welded Tee Joint, Materials Science Forum Vol. 726 (2012).

DOI: 10.4028/www.scientific.net/msf.726.100

[4] Kozak J., Problemy oceny wybranych własności wytrzymałościowych stalowych, dwupowłokowych struktur okrętowych, Wydawnictwo Politechniki Gdańskiej, ISBN 83-7348-136-2, Gdańsk (2005).

[5] Boroński D., Szala J., Tests of local strains in steel laser-welded sandwich structure, Gdańsk: Polish Maritime Research, Special issue 2006/S1, ISSN 1233-2585, (2006).

[6] Boroński D., Cyclic material properties distribution in laser-welded joints, International Journal of Fatigue, Volume 28, Issue 4, p.346–354, (2006).

DOI: 10.1016/j.ijfatigue.2005.07.029

[7] Radaj D., Sonsino C. M., Fricke W., Fatigue assessment of welded joints by local approaches, 2nd Ed. Cambridge, England: Woodhead Publishing Limited, ISBN-13: 978-1-85573-948-2, (2006).

DOI: 10.1533/9781845691882.13