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To understand better the structure-property relationships of wood  in situ , nondestructive synchrotron-based tomographic microscopy (SbTM) with subcellular resolution is useful. In this context, an  in situ  testing device was developed to determine the cellular response of wood to mechanical loading. Different rotationally symmetric specimens were tested to synchronize the failure areas to the given scanning areas. Norway spruce samples were uniaxially compressed in the longitudinal direction and scanned  in situ  at several increasing relative forces ending up in the plastic deformation regime. A sufficiently high quality  in situ  tomography was demonstrated. The reconstructed data allowed the observation of the load-dependent development of failure regions: cracks and buckling on the microstructure were clearly visible. Future investigations with SbTM on different wood species, loading directions, and different moisture contents are promising in terms of the micromechanical behavior of wood.

holzforschung

Synchrotron-based tomographic microscopy (SbTM) of wood: development of a testing device and observation of plastic deformation of uniaxially compressed Norway spruce samples