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A 2nd−order SCF solution for modeling distortion effects on fatigue of lightweight structures

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Abstract

This paper focuses on a series of new developments on analytical treatment of secondary stress concentration effects caused by the presence of angular and buckling distortions in thin plate structures. The distortion profiles are idealized through a simple mechanics treatment upon which the analytical solution to the stress concentration factor (SCF) induced by secondary bending is further derived. With such approach, the distortion effects on fatigue behaviors can be captured without the need for performing detailed finite element calculations incorporating measured distortions. The applications of these analytical solutions incorporating secondary bending caused by distortions and remote loading are demonstrated by analyzing existing test data obtained on small-scale thin plate butt joints containing local and global angular distortions. By considering the fatigue test data as well as measured distortion data, the use of so calculated SCFs not only enable an effective correlation among simple butt-welded specimens with various forms of angular and axial misalignments, but also between the tested specimens and the 2007 ASME master S-N curve scatter band which contain large-scale fatigue test data with plate thicknesses ranging from 5 mm up to over 100 mm.

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Funding

The authors acknowledge the support of this work through a grant from the National Research Foundation of Korea (NRF) Grant funded by the Korea government (MEST) through GCRC-SOP at the University of Michigan under Project 2-1 (No. 18-04523): Reliability and Strength Assessment of Core Parts and Material System. P. Dong also acknowledges the financial support made possible by the Traction Power National Key Laboratory Open Competition Grant (No. TPL 1605).

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Authors and Affiliations

  1. Department of Naval Architecture and Marine Engineering, University of Michigan, Ann Arbor, MI, USA

    Wenqing Zhou & Pingsha Dong

  2. Department of Mechanical Engineering, Aalto University, Aalto, Finland

    Ingrit Lillemae & Heikki Remes

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  1. Wenqing Zhou
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  2. Pingsha Dong
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  3. Ingrit Lillemae
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  4. Heikki Remes
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Correspondence to Pingsha Dong.

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Recommended for publication by Commission X - Structural Performances of Welded Joints - Fracture Avoidance

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Zhou, W., Dong, P., Lillemae, I. et al. A 2nd−order SCF solution for modeling distortion effects on fatigue of lightweight structures. Weld World 63, 1695–1705 (2019). https://doi.org/10.1007/s40194-019-00772-7

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  • DOI: https://doi.org/10.1007/s40194-019-00772-7

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