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Improved simulation of spot weld joints in vehicle components
2006 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This work is a study to determine the potential for a local/global mapping template for spot weld simulation. Spot welds between components of press hardened boron 02 steels can, when subjected to certain load cases show a brittle behavior leading to unreliable simulation results. The failure in these cases is caused by strain localization and crack initiation the heat affected zone or the weld plug. This behavior cannot be captured by any cost effective spot weld representation. The reason for this is that the crack initiation occurs at a small spatial region, therefore requiring too high mesh density. There are methods that can capture failure in the principal load cases such as pure shear and pure peel loading, but the results from these experiments cannot be interpolated with accuracy for mixed loading. This problem is solved by implementing a local/global template, where displacements from a global simulation is extracted and applied onto a local simulation of the spot weld region. The local model is detailed enough to capture the crack initiation and propagation. The local model is very cost effective since only the area slightly outside the spot weld is investigated. The method is verified and considered successful in predicting crack initiation in spot welds of boron 02 components.

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Keyword [en]
Keyword [sv]
URN: urn:nbn:se:ltu:diva-44074ISRN: LTU-EX--06/131--SELocal ID: 1e224e6c-0c71-4ecd-a59c-b2daff535658OAI: diva2:1017349
Subject / course
Student thesis, at least 30 credits
Educational program
Mechanical Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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