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Fatigue assessment of laserbeam welded PM steel components by the notch stress approach

Baumgartner, Jörg ; Waterkotte, Ralf ; Sonsino, Cetin Morris (2010):
Fatigue assessment of laserbeam welded PM steel components by the notch stress approach.
In: World Powder Metallurgy Congress and Exhibition, World PM 2010. Vol.3 : 10th - 14th October 2010, Fortezza da Basso, Florence, Italy,
Florence, ISBN 978-1-899072-19-4,
[Conference or Workshop Item]

Abstract

In the presented investigation of a laserbeam welded engine part the fatigue design methodology is shown. The fatigue critical area of the joint component is the hidden weld root which can be evaluated only by a local assessment concept. The local fatigue strength of a laserbeam weld of a complex engine component, which joins a PM with a formed sheet component, was assessed by the notch stress concept with the fictitious reference radius of rref = 0.05 mm. First, simplified specimens, following the main geometric dimensions of the parts, were manufactured. On these specimens the fatigue strength was identified by tests and the notch stresses calculated by finite element analysis. Based on these results a design SN-curve was derived to assess the fatigue strength of the engine component. The numerical assessment of the welded joint was verified by proof tests with the component. The assessment could be improved by considering statistical and stress gradient dependent siz e effects according to the concept of the highly stressed volume.

Item Type: Conference or Workshop Item
Erschienen: 2010
Creators: Baumgartner, Jörg ; Waterkotte, Ralf ; Sonsino, Cetin Morris
Title: Fatigue assessment of laserbeam welded PM steel components by the notch stress approach
Language: English
Abstract:

In the presented investigation of a laserbeam welded engine part the fatigue design methodology is shown. The fatigue critical area of the joint component is the hidden weld root which can be evaluated only by a local assessment concept. The local fatigue strength of a laserbeam weld of a complex engine component, which joins a PM with a formed sheet component, was assessed by the notch stress concept with the fictitious reference radius of rref = 0.05 mm. First, simplified specimens, following the main geometric dimensions of the parts, were manufactured. On these specimens the fatigue strength was identified by tests and the notch stresses calculated by finite element analysis. Based on these results a design SN-curve was derived to assess the fatigue strength of the engine component. The numerical assessment of the welded joint was verified by proof tests with the component. The assessment could be improved by considering statistical and stress gradient dependent siz e effects according to the concept of the highly stressed volume.

Journal or Publication Title: Proceedings of the World Powder Metallurgy Congress and Exhibition, World PM 2010
Title of Book: World Powder Metallurgy Congress and Exhibition, World PM 2010. Vol.3 : 10th - 14th October 2010, Fortezza da Basso, Florence, Italy
Place of Publication: Florence
ISBN: 978-1-899072-19-4
Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Research group System Reliability, Adaptive Structures, and Machine Acoustics (SAM)
Date Deposited: 25 Feb 2021 06:34
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