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Adaptive Neutron Radiography Correlation for Simultaneous Imaging of Moisture Transport and Deformation in Hygroscopic Materials

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Abstract

Neutron radiography is a key non-destructive testing technology for the investigation of moisture transport in materials. However, quantitative moisture measurements in swelling materials are currently challenging due to the lack of referencing between moist and dry state radiographs. A novel adaptive texture correlation algorithm is presented to simultaneously image inhomogeneous moisture distributions and moisture-induced strain fields. The proposed method provides a valuable tool for the study of time- and position-dependent hygromechanical interactions. Moreover, it requires no modification of existing neutron installations. The method was validated against gravimetric moisture content and optic surface deformation measurements. Its applicability was demonstrated for two actual topics in wood science, the investigation of moisture gradients within the growth ring microstructure and the study of moisture transport processes in wood-fiber composites. The algorithm can be widely used to characterize hygroscopic materials with heterogeneous texture, as frequently found in wood constructions, food industry, engineering and soil science.

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Authors and Affiliations

  1. Institute for Building Materials ETH Zurich, Stefano-Franscini-Platz 6, CH-8093, Zurich, Switzerland

    S. J. Sanabria, C. Lanvermann, F. Michel & P. Niemz

  2. Neutron Imaging and Activation Group, Paul Scherrer Institute, CH-5232 PSI, Villigen, Switzerland

    D. Mannes

Authors
  1. S. J. Sanabria
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  2. C. Lanvermann
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  3. F. Michel
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  4. D. Mannes
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  5. P. Niemz
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Correspondence to S. J. Sanabria.

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Sanabria, S.J., Lanvermann, C., Michel, F. et al. Adaptive Neutron Radiography Correlation for Simultaneous Imaging of Moisture Transport and Deformation in Hygroscopic Materials. Exp Mech 55, 403–415 (2015). https://doi.org/10.1007/s11340-014-9955-2

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  • DOI: https://doi.org/10.1007/s11340-014-9955-2

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