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Acoustic emission and synchrotron radiation X-ray tomographic in-situ microscopy of sub-macroscopic damage phenomena in wood

F. Ritschel and M. Zauner and S. J. Sanabria and A. J. Brunner and P. Niemz
Proc. 18th International Symposium on Non-destructive Testing and Evaluation of Wood
Madison, WI, USA 2013

Abstract

Spruce wood specimens (Picea abies (L.) Karst.) exposed to stepwise tensile load parallel and perpendicular to fiber orientation until failure were monitored simultaneously with in-situ Acoustic Emission (AE) measurement and Synchrotron Radiation X-ray Tomographic Microscopy (SRXTM). The AE method enables high time resolution (sub-ms) of damage initiation and accumulation. The SRXTM allows three-dimensional volumetric high-resolution visualization of the inner wood cellular structure, providing information on microscopic structural changes leading to ultimate failure in stressed wood. To achieve a maximum resolution of 1.85 µm3 per voxel, specimens were prepared with a predefined breaking point in the form of a taper. The applicability of this approach was demonstrated by comparing the visualized structural changes in the SRXTM reconstruction with the AE signatures. Significant differences were observed among the tested load directions, which could be tracked in space and time with SRXTM and AE, respectively.


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@InProceedings{eth_biwi_01113,
  author = {F. Ritschel and M. Zauner and S. J. Sanabria and A. J. Brunner and P. Niemz},
  title = {Acoustic emission and synchrotron radiation X-ray tomographic in-situ microscopy of sub-macroscopic damage phenomena in wood},
  booktitle = {Proc. 18th International Symposium on Non-destructive Testing and Evaluation of Wood},
  year = {2013},
  pages = {434-441},
  publisher = {USDA Forest Products Laboratory},
  keywords = {}
}