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Computational Weld Mechanics - estimation of angular distortion and residual stresses
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Lightweight Structures.
2018 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The present study estimates the angular distortion and the residual stresses using the following methodologies: Thermo-elastic-plastic, Inherent strain (local-global) and Substructuring on two types of welded joints: T-type fillet weld and butt weld. The numerical results are compared with the experimental measurements and these methodologies are evaluated in terms of accuracy and computational time. The influence of welding sequence towards distortion and transverse residual stresses has been studied numerically by implementing Thermo-elastic-plastic and Inherent strain (local-global) methods on T-type fillet weld. It shows that the welding position and welding direction have almost the same influence on angular distortions from Thermo-elastic-plastic method. The Inherent strain (local-global) method can estimate the angular distortion caused by different weld position in good agreement with Thermo-elastic-plastic method. To have a better understanding of where the underestimation of angular distortion in Inherent strain (local-global) method comes from, the study discusses the influence of block length and welding speed towards angular distortion. It is found that for long weld length or slow welding speed, activating the plastic strain gradually by dividing the weld bead into an appropriate number of blocks can reduce the level of underestimation of angular distortion.

Place, publisher, year, edition, pages
2018. , p. 24
Series
TRITA-SCI-GRU ; 2018:406
Keywords [en]
Angular distortion; Residual stresses; Thermo-elastic-plastic; Inherent strain; Substructuring
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-244410OAI: oai:DiVA.org:kth-244410DiVA, id: diva2:1290415
Examiners
Available from: 2019-02-20 Created: 2019-02-20 Last updated: 2019-02-20Bibliographically approved

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