Fatigue strength modelling of high-performance welds using local approaches

Heikki Remes; Jasmin Jelovica; Jani Romanoff; Pauli Lehto; Sami Liinalampi

Fatigue strength modelling of high-performance welds using local approaches

Heikki Remes, Jasmin Jelovica, Jani Romanoff, Pauli Lehto, Sami Liinalampi

Department of Mechanical Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

1 Citation (Scopus)

Abstract

This paper investigates the effect of weld geometry on the fatigue strength of butt joints. The influence of weld notch shape and weld flank angle is studied with finite element analysis and three different local approaches. The applied approaches are notch stress approach, linear elastic-fracture mechanics (LEFM), and recently published strain-based crack growth approach. In this strain-based approach, the fatigue damage process is modelled as a sequence of repeated crack initiation processes. This enables to consider the influence of short crack initiation and growth. The numerical simulations are compared to fatigue test results. The study reveals that for high-performance welds with favorable notch geometry, the macro crack initiation period becomes significant causing inaccuracies with notch stress approach and LEFM. For a normal-quality weld with the undercut depth of 0.1 mm, the macro crack propagation dominates the total fatigue life. In this case, all approaches show somewhat similar estimation on the fatigue strength.

Original language	English
Title of host publication	Proceedings of the 13th International Symposium on PRActical Design of Ships and Other Floating Structures (PRADS' 2016)
Publisher	Technical University of Denmark
ISBN (Electronic)	978-87-7475-473-2
Publication status	Published - 2016
MoE publication type	A4 Conference publication
Event	International Symposium on Practical Design of Ships and Other Floating Structures - Crowne Plaza Copenhagen Towers, Copenhagen, Denmark Duration: 4 Sept 2016 → 8 Sept 2016 Conference number: 13 http://www.prads2016.dk/

Conference

Conference	International Symposium on Practical Design of Ships and Other Floating Structures
Abbreviated title	PRADS
Country/Territory	Denmark
City	Copenhagen
Period	04/09/2016 → 08/09/2016
Internet address	http://www.prads2016.dk/

Keywords

fatigue strenght
flank angle
linar elastic fracture mechanics
notch stress approach
strain-based crack growth approach
undercut

Cite this

@inproceedings{497eb9843b764f3384e22e743e8e059c,

title = "Fatigue strength modelling of high-performance welds using local approaches",

abstract = "This paper investigates the effect of weld geometry on the fatigue strength of butt joints. The influence of weld notch shape and weld flank angle is studied with finite element analysis and three different local approaches. The applied approaches are notch stress approach, linear elastic-fracture mechanics (LEFM), and recently published strain-based crack growth approach. In this strain-based approach, the fatigue damage process is modelled as a sequence of repeated crack initiation processes. This enables to consider the influence of short crack initiation and growth. The numerical simulations are compared to fatigue test results. The study reveals that for high-performance welds with favorable notch geometry, the macro crack initiation period becomes significant causing inaccuracies with notch stress approach and LEFM. For a normal-quality weld with the undercut depth of 0.1 mm, the macro crack propagation dominates the total fatigue life. In this case, all approaches show somewhat similar estimation on the fatigue strength.",

keywords = "fatigue strenght, flank angle, linar elastic fracture mechanics, notch stress approach, strain-based crack growth approach, undercut",

author = "Heikki Remes and Jasmin Jelovica and Jani Romanoff and Pauli Lehto and Sami Liinalampi",

year = "2016",

language = "English",

booktitle = "Proceedings of the 13th International Symposium on PRActical Design of Ships and Other Floating Structures (PRADS' 2016)",

publisher = "Technical University of Denmark",

address = "Denmark",

note = "International Symposium on Practical Design of Ships and Other Floating Structures, PRADS ; Conference date: 04-09-2016 Through 08-09-2016",

url = "http://www.prads2016.dk/",

}

Remes, H, Jelovica, J, Romanoff, J , Lehto, P & Liinalampi, S 2016, Fatigue strength modelling of high-performance welds using local approaches. in Proceedings of the 13th International Symposium on PRActical Design of Ships and Other Floating Structures (PRADS' 2016). Technical University of Denmark, International Symposium on Practical Design of Ships and Other Floating Structures, Copenhagen, Denmark, 04/09/2016.

Fatigue strength modelling of high-performance welds using local approaches. / Remes, Heikki; Jelovica, Jasmin; Romanoff, Jani et al.
Proceedings of the 13th International Symposium on PRActical Design of Ships and Other Floating Structures (PRADS' 2016). Technical University of Denmark, 2016.

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

TY - GEN

T1 - Fatigue strength modelling of high-performance welds using local approaches

AU - Remes, Heikki

AU - Jelovica, Jasmin

AU - Romanoff, Jani

AU - Lehto, Pauli

AU - Liinalampi, Sami

N1 - Conference code: 13

PY - 2016

Y1 - 2016

N2 - This paper investigates the effect of weld geometry on the fatigue strength of butt joints. The influence of weld notch shape and weld flank angle is studied with finite element analysis and three different local approaches. The applied approaches are notch stress approach, linear elastic-fracture mechanics (LEFM), and recently published strain-based crack growth approach. In this strain-based approach, the fatigue damage process is modelled as a sequence of repeated crack initiation processes. This enables to consider the influence of short crack initiation and growth. The numerical simulations are compared to fatigue test results. The study reveals that for high-performance welds with favorable notch geometry, the macro crack initiation period becomes significant causing inaccuracies with notch stress approach and LEFM. For a normal-quality weld with the undercut depth of 0.1 mm, the macro crack propagation dominates the total fatigue life. In this case, all approaches show somewhat similar estimation on the fatigue strength.

AB - This paper investigates the effect of weld geometry on the fatigue strength of butt joints. The influence of weld notch shape and weld flank angle is studied with finite element analysis and three different local approaches. The applied approaches are notch stress approach, linear elastic-fracture mechanics (LEFM), and recently published strain-based crack growth approach. In this strain-based approach, the fatigue damage process is modelled as a sequence of repeated crack initiation processes. This enables to consider the influence of short crack initiation and growth. The numerical simulations are compared to fatigue test results. The study reveals that for high-performance welds with favorable notch geometry, the macro crack initiation period becomes significant causing inaccuracies with notch stress approach and LEFM. For a normal-quality weld with the undercut depth of 0.1 mm, the macro crack propagation dominates the total fatigue life. In this case, all approaches show somewhat similar estimation on the fatigue strength.

KW - fatigue strenght

KW - flank angle

KW - linar elastic fracture mechanics

KW - notch stress approach

KW - strain-based crack growth approach

KW - undercut

UR - http://orbit.dtu.dk/files/127664364/PRADS_2016_Proceedings_ORBIT.pdf

UR - http://www.scopus.com/inward/record.url?scp=85026443599&partnerID=8YFLogxK

M3 - Conference article in proceedings

BT - Proceedings of the 13th International Symposium on PRActical Design of Ships and Other Floating Structures (PRADS' 2016)

PB - Technical University of Denmark

T2 - International Symposium on Practical Design of Ships and Other Floating Structures

Y2 - 4 September 2016 through 8 September 2016

ER -

Fatigue strength modelling of high-performance welds using local approaches

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Conference

Keywords

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