A crack-location correction for T 0 analysis of an alloy 52 dissimilar metal weld

Sebastian Lindqvist (Corresponding Author), Matias Ahonen, Jari Lydman, Pentti Arffman, Hannu Hänninen

Research output: Contribution to journalArticleScientificpeer-review

Abstract

For narrow-gap Alloy 52 dissimilar metal welds, the fusion boundary between the ferritic pressure vessel steel and austenitic Ni-base alloy weld metal is the weakest region from fracture mechanical perspective. Producing of the pre-crack for fracture toughness test specimens in the fusion boundary region to determine T 0 is challenging. For pre-cracks further away from the fusion boundary, the brittle fracture initiation does not necessarily occur on the initial crack plane, but rather in the fusion boundary region. This offset in initiation site can increase the measured fracture toughness leading to a nonconservative T 0 estimate. In this study, a method is proposed for correcting the fracture toughness for crack location and obtaining a lower boundary fracture toughness curve. The crack-location correction shows promise for analysing T 0 of specimens with pre-cracks systematically at a significant distance from the weakest region, but with brittle fracture initiation still occurring at the weakest location.

Original languageEnglish
Pages (from-to)320-334
Number of pages15
JournalEngineering Fracture Mechanics
Volume214
DOIs
Publication statusPublished - 1 Jun 2019
MoE publication typeNot Eligible

Fingerprint

Dissimilar metals
Welds
Cracks
Fracture toughness
Fusion reactions
Brittle fracture
Steel structures
Metals

Keywords

  • Brittle fracture
  • Brittle fracture initiation
  • Crack path
  • Dissimilar metal weld
  • Master Curve

Cite this

@article{5831ee8644604cd7adbac92f16364eaa,
title = "A crack-location correction for T 0 analysis of an alloy 52 dissimilar metal weld",
abstract = "For narrow-gap Alloy 52 dissimilar metal welds, the fusion boundary between the ferritic pressure vessel steel and austenitic Ni-base alloy weld metal is the weakest region from fracture mechanical perspective. Producing of the pre-crack for fracture toughness test specimens in the fusion boundary region to determine T 0 is challenging. For pre-cracks further away from the fusion boundary, the brittle fracture initiation does not necessarily occur on the initial crack plane, but rather in the fusion boundary region. This offset in initiation site can increase the measured fracture toughness leading to a nonconservative T 0 estimate. In this study, a method is proposed for correcting the fracture toughness for crack location and obtaining a lower boundary fracture toughness curve. The crack-location correction shows promise for analysing T 0 of specimens with pre-cracks systematically at a significant distance from the weakest region, but with brittle fracture initiation still occurring at the weakest location.",
keywords = "Brittle fracture, Brittle fracture initiation, Crack path, Dissimilar metal weld, Master Curve",
author = "Sebastian Lindqvist and Matias Ahonen and Jari Lydman and Pentti Arffman and Hannu H{\"a}nninen",
year = "2019",
month = "6",
day = "1",
doi = "10.1016/j.engfracmech.2019.03.001",
language = "English",
volume = "214",
pages = "320--334",
journal = "Engineering Fracture Mechanics",
issn = "0013-7944",
publisher = "Elsevier",

}

A crack-location correction for T 0 analysis of an alloy 52 dissimilar metal weld. / Lindqvist, Sebastian (Corresponding Author); Ahonen, Matias; Lydman, Jari; Arffman, Pentti; Hänninen, Hannu.

In: Engineering Fracture Mechanics, Vol. 214, 01.06.2019, p. 320-334.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - A crack-location correction for T 0 analysis of an alloy 52 dissimilar metal weld

AU - Lindqvist, Sebastian

AU - Ahonen, Matias

AU - Lydman, Jari

AU - Arffman, Pentti

AU - Hänninen, Hannu

PY - 2019/6/1

Y1 - 2019/6/1

N2 - For narrow-gap Alloy 52 dissimilar metal welds, the fusion boundary between the ferritic pressure vessel steel and austenitic Ni-base alloy weld metal is the weakest region from fracture mechanical perspective. Producing of the pre-crack for fracture toughness test specimens in the fusion boundary region to determine T 0 is challenging. For pre-cracks further away from the fusion boundary, the brittle fracture initiation does not necessarily occur on the initial crack plane, but rather in the fusion boundary region. This offset in initiation site can increase the measured fracture toughness leading to a nonconservative T 0 estimate. In this study, a method is proposed for correcting the fracture toughness for crack location and obtaining a lower boundary fracture toughness curve. The crack-location correction shows promise for analysing T 0 of specimens with pre-cracks systematically at a significant distance from the weakest region, but with brittle fracture initiation still occurring at the weakest location.

AB - For narrow-gap Alloy 52 dissimilar metal welds, the fusion boundary between the ferritic pressure vessel steel and austenitic Ni-base alloy weld metal is the weakest region from fracture mechanical perspective. Producing of the pre-crack for fracture toughness test specimens in the fusion boundary region to determine T 0 is challenging. For pre-cracks further away from the fusion boundary, the brittle fracture initiation does not necessarily occur on the initial crack plane, but rather in the fusion boundary region. This offset in initiation site can increase the measured fracture toughness leading to a nonconservative T 0 estimate. In this study, a method is proposed for correcting the fracture toughness for crack location and obtaining a lower boundary fracture toughness curve. The crack-location correction shows promise for analysing T 0 of specimens with pre-cracks systematically at a significant distance from the weakest region, but with brittle fracture initiation still occurring at the weakest location.

KW - Brittle fracture

KW - Brittle fracture initiation

KW - Crack path

KW - Dissimilar metal weld

KW - Master Curve

UR - http://www.scopus.com/inward/record.url?scp=85063191671&partnerID=8YFLogxK

U2 - 10.1016/j.engfracmech.2019.03.001

DO - 10.1016/j.engfracmech.2019.03.001

M3 - Article

VL - 214

SP - 320

EP - 334

JO - Engineering Fracture Mechanics

JF - Engineering Fracture Mechanics

SN - 0013-7944

ER -