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Fracture mechanic analysis andfatigue life assessment of weldedstructures – A parametric designstudy
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.), Solid Mechanics (Div.).
2019 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Weld quality is one of the primary factors that controls the fatigue life in the light weight structures made by high strength steel. It has been observed that a lack of penetration, as the most common defect found in the weld root, can cause stress concentration in fillet joints which reduces the life. In this study, the Linear Elastic Fracture Mechanic was employed to evaluate the fatigue life of box-shaped welded structure. A parametric study was also performed on various parameters such as lack of weld metal penetration, load position and plate thicknesses. Assuming the existence of various root gaps after the welding process, the stage of a fatigue crack initiation becomes insignificant and the crack propagation can be simulated by postulating these initial crack-like flaws. FRANC3D software was adopted to obtain the stress intensity factor values for two types of full-length and intermediate crack sizes, located at the critical region of weld. The residual life based on co-planar growth of the root crack under constant cyclic loads was estimated. Based on the experimental results, the Linear Elastic Fracture Mechanic approach could describe the crack propagation from the weld root reasonably well under the given conditions and estimate the residual fatigue life of the welded structures conservatively.

Place, publisher, year, edition, pages
2019. , p. 88
Series
TRITA-SCI-GRU ; 2019:302
Keywords [en]
Fatigue crack growth, welded structures, Linear Elastic Fracture Mechanic (LEFM), stress intensity factor, finite element method, lightweight structures, FRANC3D
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-260096OAI: oai:DiVA.org:kth-260096DiVA, id: diva2:1354585
External cooperation
Cargotec Sweden AB Bromma Conquip
Subject / course
Solid Mechanics
Supervisors
Examiners
Available from: 2019-09-25 Created: 2019-09-25 Last updated: 2019-09-25Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf