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 S Structural Integrity Procedia 00 (2019) 000 – 000

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ScienceDirect

Procedia Structural Integrity 19 (2019) 610–616

Fatigue Design 2019 Use of the Peak Stress Method to assess the fatigue life of large welded steel structures Théophane Vanlemmens a , Guillaume Elbel a , Giovanni Meneghetti b Fatigue Design 2019 se of the eak tress ethod to assess the fatigue life of large elded steel structures Théophane Vanle ens a , Guillau e Elbel a , Giovanni Meneghetti b

a Liebherr-France SAS, Colmar, France b Department of Industrial Engineering - University of Padova, Padova, Italy a Liebherr-France SAS, Colmar, France b Department of Industrial Engineering - University of Padova, Padova, Italy

Abstract Abstract

A precise life assessment of weld seams in large welded steel structures such as the ones from crawler excavators is very important in order to be able to optimize these structures. The local stress approaches with fictitious notch radius have been proved to be necessary to achieve the desired precision in some cases. Unfortunately, these methods are very time and resources consuming making it impossible to be applied systematically on large steel structures. The Peak Stress Method (PSM) could be an alternative since its precision seems to be good and that the method is much easier to apply. This paper shows the results of the tests that have been done on PSM applied to large steel structures from hydraulic excavators. Comparisons have been made in terms of precision and speed with the fictitious notch radius method. A precise life assessment of weld seams in large welded steel structures such as the ones from crawler excavators is very important in order to be able to optimize these structures. The local stress approaches with fictitious notch radius have been proved to be necessary to achieve the desired precision in some cases. Unfortunately, these methods are very time and resources consuming making it impossible to be applied systematically on large steel structures. The Peak Stress Method (PSM) could be an alternative since its precision seems to be good and that the method is much easier to apply. This paper shows the results of the tests that have been done on PSM applied to large steel structures from hydraulic excavators. Comparisons have been made in terms of precision and speed with the fictitious notch radius method.

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers. © 2019 The uthors. Published by Elsevier . . Peer-revie under responsibility of the Fatigue esign 2019 rganizers. 20 9 The uthors. Published by Elsevier . . eer-revie under responsibility of the Fatigue esign 2019 rganizers. Keywords: fatigue; weld seams; industrial applications; local stress approach Keywords: fatigue; weld seams; industrial applications; local stress approach

1. Introduction 1. Introduction

The aim of this paper is to show some results of the application of the Peak Stress Method (called PSM in this paper) for the life assessment of large welded steel structures such as crawler excavators main steel components (attachments and undercarriages). The PSM method will not be presented in detail in this paper, the reader is invited to refer to Meneghetti’s papers that are listed in the bibliography for this purpose ([2] and [3]). The PSM presents some characteristics that make it easier to apply than other local stress approaches used in the industry for this purpose such as the fictitious notch radius concept suggested by Radaj and recommended by the IIW [4] (called R1 concept in this paper). After a first part devoted to present briefly the current fatigue simulation method used and the opportunities identified with PSM, the second part will show the results that have been obtained during this test phase, and compare them to results using the R1 concept. The third part will show a possible extension of the PSM to assess the life of weld ends. The aim of this paper is to show some results of the application of the Peak Stress Method (called PSM in this paper) for the life assessment of large welded steel structures such as crawler excavators main steel components (attachments and undercarriages). The PSM method will not be presented in detail in this paper, the reader is invited to refer to Meneghetti’s papers that are listed in the bibliography for this purpose ([2] and [3]). The PSM presents some characteristics that make it easier to apply than other local stress approaches used in the industry for this purpose such as the fictitious notch radius concept suggested by Radaj and recommended by the IIW [4] (called R1 concept in this paper). After a first part devoted to present briefly the current fatigue simulation method used and the opportunities identified with PSM, the second part will show the results that have been obtained during this test phase, and compare them to results using the R1 concept. The third part will show a possible extension of the PSM to assess the life of weld ends.

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers. 10.1016/j.prostr.2019.12.066 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.