Experimental Mechanics

, Volume 53, Issue 4, pp 543–556 | Cite as

3D Digital Volume Correlation of Synchrotron Radiation Laminography Images of Ductile Crack Initiation: An Initial Feasibility Study

Article

Abstract

A feasibility study of measuring 3D displacement fields in the bulk during ductile crack initiation via combined Synchrotron Radiation Computed Laminography (SRCL) and Digital Volume Correlation (DVC) is performed. In contrast to tomography, SRCL is a technique that is particularly adapted to obtain three-dimensional (3D) reconstructed volumes of objects that are laterally extended (i.e., in 2 directions) and thin in the third direction, i.e. sheet-like objects. In-situ laminography data of an initiating crack ahead of a machined notch are used with a voxel size of 0.7 μm. The natural contrast of the observed 2XXX Al-alloy caused by intermetallic particles and initial porosity is used to measure displacement fields via a global DVC technique assuming a continuous displacement field. An initial performance study is carried out on data of the same undeformed material but after a substantial shift of the laminography rotation axis with respect to the imaged specimen. Volume correlations between different loading steps provide displacement fields that are qualitatively consistent with the remote loading conditions. Computed strain fields display a strain concentration close to the notch tip.

Keywords

Aluminium alloy Digital Volume Correlation Ductile fracture Displacement field Resolution Strain field Synchrotron Radiation Laminography 

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Copyright information

© Society for Experimental Mechanics 2012

Authors and Affiliations

  • T. F. Morgeneyer
    • 1
  • L. Helfen
    • 2
    • 3
  • H. Mubarak
    • 1
  • F. Hild
    • 4
  1. 1.Mines ParisTech, Centre des Matériaux, CNRS UMR 7633Evry CedexFrance
  2. 2.ANKA/Institute for Synchrotron Radiation, Karlsruhe Institute of Technology (KIT)KarlsruheGermany
  3. 3.European Synchrotron Radiation Facility (ESRF)Grenoble cedexFrance
  4. 4.LMT-Cachan, ENS Cachan/CNRS/UPMC/PRES UniverSud ParisCachan CedexFrance

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