Baensch, FranziskaFranziskaBaenschSause, Markus G.R.Markus G.R.SauseBrunner, Andreas J.Andreas J.BrunnerNiemz, PeterPeterNiemz2024-11-192024-11-1920151437-434X10.24451/arbor.11288https://doi.org/10.24451/arbor.1128810.1515/hf-2014-0072https://arbor.bfh.ch/handle/arbor/32913Tensile tests of miniature spruce wood specimens have been performed to investigate the damage evolution in wood at the microscopic scale. For this purpose, the samples were stepwise tensile loaded in the longitudinal (L) and radial (R) directions and the damage evolution was monitored in real-time by acoustic emission (AE) and synchrotron radiation micro-computed tomography (SRμCT). This combination is of outstanding benefit as SRμCT monitoring provides an insight on the crack evolution and the final fracture at microscopic scale, whereas AE permits the detection of the associated accumulation and interaction of single damage events on all length scales with high time resolution. A significant drawback of the AE testing of wood has been overcome by means of calibrating the AE amplitudes with the underlying crack length development. Thus, a setup-dependent and wood species-dependent calibration value was estimated, which associates 1 μm.enacoustic emission crack growth damage evolution frequency spectrum microscopic damage mechanisms Spruce unsupervised pattern recognitionQ1QCT1THTJarticle