The inclusion of short-transverse displacements in the eigenstrain reconstruction of residual stress and distortion in in740h weldments

Fatih Uzun (Corresponding Author), Joris Everaerts, Leon Brandt, Mehmet Emin Kartal, Enrico Salvati, A.M. Korsunsky (Corresponding Author)

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The purpose of the present study is to predict the residual stress and distortion of Inconel Alloy 740H componentns during the fabrication of welded components used for advanced ultra-supercritical technology by means of solving the inverse eigenstrain problem. The proposed model determines the distribution of two components of eigenstrain using two-dimensional displacement data obtained from high precision coordinate measurements. Input for the model is provided by the geometric characterisation of electric discharge machining (EDM) sectioned weld bead on plate sample, namely, the out-of-plane distortion of a transverse thin section across the weld line. The deplanation of the original sample is used for cross-validation using the contour method approach, modified recently by the present authors on the basis eigenstrain-based analysis. After determination of the distribution of eigenstrain components, residual stress and displacement calculations are performed in the whole body of as-welded and heat-treated plate models. Results are first verified using experimentally determined residual stress, displacement and distortion on the sectioned surfaces. In addition, 12 mm slices are cut from both model geometries and calculations are repeated using previously determined eigenstrain distributions. Measured distortions on the surface of bar models allowed a fourth term for verification of the eigenstrain distribution.
Original languageEnglish
Pages (from-to)601-612
Number of pages12
JournalJournal of Manufacturing Processes
Volume36
Early online date20 Nov 2018
DOIs
Publication statusPublished - 31 Dec 2018

Keywords

  • Weld distortion
  • Volumetric residual stress
  • Eigenstrain contour method
  • Reconstruction
  • Iterative finite element modelling

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