PSI - Issue 19

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000–000

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 19 (2019) 627–636

Fatigue Design 2019 Definition of nominal stress-based FAT classes of complex welded Fatigue Design 2019 Definition of nominal stress-based FAT classes of complex welded steel structures using the Peak Stress Method Michele Zanetti a,b , Vittorio Babini b , Giovanni Meneghetti a * steel structures using the Peak Stress Method Michele Zanetti a,b , Vittorio Babini b , Giovanni Meneghetti a *

a Department of Industrial Engineering, University of Padova, Via Venezia, 1 – 35131 Padova (Italy) b Antonio Zamperla Spa, via Monte Grappa 15/17, 36077, Altavilla Vicentina (VI) a Department f Industrial Engineer ng, U iversity of Padova, Via Venezia, 1 – 35131 Padova (Italy) b Antonio Zamperla Spa, via Monte Grappa 15/17, 36077, Altavilla Vicentina (VI)

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers. Roller coasters present many types of complex welded joints that differ in (i) technological parameters, e.g. weld penetration, and (ii) geometrical parameters, e.g. track pipes number, shape and number of connection elements between track pipes (tie beam, cross beam, lattice structures, etc.). Due to complex geometries and limited number of FAT classes available in design standards, finding appropriate FAT classes consistent with the real geometries is frequently troublesome. To overcome this problem, in this paper some applications of the mentioned local approach are proposed; the outcome is the definition of FAT classes in terms of nominal stress starting from the design curve calibrated in the context of the PSM. The advantage is that it is possible to perform FE analysis with beam elements, having in hands FAT classes derived from a robust local approach and faithful to real geometries. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers. Abstract The purpos of this paper is to report some industrial applic tions of the local approach Peak Stress Meth d (PSM) in fatigue stre gth assessment of complex welded steel joints adopted in amusement park structures, focusing on roller coasters. This method is an application of t e N-SIFs approach and it is based on the singular, linear elastic peak stresses calculated from FE analyses with coarse free meshes. F r fatigue strength assessment of large structures like roller coasters, companies often prefer using FE beam models and compare nominal stresses with fatigue strength values (FAT classes) available in design sta dards. Roller coasters resent many types of complex w lded joints that differ in (i) t hnological parameters, e.g. weld penetration, and (ii) geometrical parameters, e.g. track pipes number, shape and number of connection elements between track pipes (tie beam, cross beam, lattice structures, etc.). Due to compl x geometries and limited number of FAT classes available in design standards, finding appropriate FAT classes co sistent with the re l geometries is frequently troublesome. To overcome this problem, in this paper some applications of the mentioned local approac are proposed; the outcome is the definition of FAT classes in ter s of nominal stress starting from the desi n curve calibrated in the context f the PSM. The advant ge is that it is possible to perform FE analysis with beam elements, having in hands FAT classes derived from a robust local approach and faithful to real geometries. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers. Abstract The purpose of this paper is to report some industrial applications of the local approach Peak Stress Method (PSM) in fatigue strength assessment of complex welded steel joints adopted in amusement park structures, focusing on roller coasters. This method is an application of the N-SIFs approach and it is based on the singular, linear elastic peak stresses calculated from FE analyses with coarse free meshes. For fatigue strength assessment of large structures like roller coasters, companies often prefer using FE beam models and compare nominal stresses with fatigue strength values (FAT classes) available in design standards.

Keywords: welded joints, Peak Stress Method (PSM), FAT class Keywords: welded joints, Peak Stress Method (PSM), FAT class

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers. * Corresponding author. Tel.: +390498276751; fax: +390498276785. E-mail address: giovanni.meneghetti@unipd.it * Corresponding author. Tel.: +390498276751; fax: +390498276785. E-mail address: giovanni.meneghetti@unipd.it

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers. 10.1016/j.prostr.2019.12.068