A stress magnification factor for plates with welding-induced curvatures

• Main Authors: Mancini, Federica, Remes, Heikki, Romanoff, Jani
• Other Authors: Department of Mechanical Engineering, Marine Technology, Aalto-yliopisto, Aalto University
• Format: Other/Unknown Material
• Language: English
• Published: 2020
• Subjects: 216 Materials engineering; Stress magnification factor; welding distortion; thin plate; non-linear geometry; non-ideal boundary conditions; Arctic
• Online Access: https://aaltodoc.aalto.fi/handle/123456789/101406

| openaire: EC/H2020/723246/EU//RAMSSES The fatigue strength of thin-walled structures can be reduced significantly by non-linear secondary bending effects resulting from geometrical imperfections such as axial and angular misalignments. The welding-induced distortions can cause a critical increase of the structural hot-spot stress in the vicinity of the weld. Traditionally, the classification society rules for the fatigue strength assessment of welded ship structures suggest an analytical formula for a stress magnification factor 푘푚 for axial and angular misalignment under axial loading condition. Recently, the well-known analytical solution for the angular misalignment has been extended to account for the curvature effect. The present paper analyses the effect of non-ideal, intermediate boundary conditions between fixed and pinned ends. In this regard, the fixity factors ρ (with 0 ≤ 휌 ≤ 1 from ideally pinned to clamped conditions) are introduced in order to model the actual constraint on the rotation close to the ends. Under tension, a non-negligible decrease of the 푘푚 factor is observed in relation to the reduction of the fixity factor at the welded end, while the fixity factor related to the loaded end has a minor effect on the 푘푚 factor. Under compression, the reduction of the beam end fixity factors results into lower buckling resistance. Peer reviewed