Thesis

A study of the residual stresses in dissimilar material brazed joints

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Awarding institution
  • University of Strathclyde
Date of award
  • 2013
Thesis identifier
  • T13444
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Abstract
  • At the heart of any procedure for modelling and assessing the design or failure of dissimilar material brazed joints there must be an understanding of the metallurgy and mechanics of the joint. There must also be an understanding of how residual stresses develop due to the joining process. The work presented in this thesis aims to develop this understanding whilst introducing a method, namely thermal autofrettage, of altering the initial residual stress distribution to improve joint performance. Due to differences in material properties, residual stresses develop in dissimilar material brazed joints during the joining process and will affect various failure mechanisms. However, there are several barriers to accurately capturing the stress state in the region of the joint and across the brazed layer using FEA and these are discussed in relation to a metallurgical study of a real dissimilar material brazed joint. It has been shown using a simplified brazed layer material model, the residual stresses predicted by FEA are in reasonable agreement with those measured with X-ray diffraction and can be explained by the relationship in material properties. FEA has also shown that depending on the plastic properties of the brazed layer, thermal autofrettage could be used to alter the initial residual stress distribution to improve the performance of the joint for a number of failure mechanisms. The findings from this research are applicable to dissimilar material brazed joints found in a range of applications; however the references listed are primarily focussed on work in fusion research and development where the use of dissimilar material brazed joints is widespread.
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  • Strathclyde theses - ask staff. Thesis no. : T13444
DOI
Date Created
  • 2012
Former identifier
  • 991119

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