Understanding and modeling links and relations between wood micro-scale characteristics and behavior of real timber elements requires scaling-up sizes of specimens as well as testing methods and instrumentation corresponding to the sophisticated diversity of wood structure.
Methods of non-destructive wood testing are getting more and more popular due to the possibility to evaluate mechanical properties of wood. However concerning to wood anisotropy and un-homogeneity in some cases it is difficult enough to get reliable results.
In this work for the experiments two testing devices were used – portable timber grader MTG and special ultrasonic strength meter, developed at Kaunas University of Technology. To explore and compare applicability of this specific testing equipment based on ultrasonic and amplitude-resonant inspection ammonia-modified and unmodified oak wood samples are used. Variable physical-mechanical and size factors of specimens were focused on comparative specification the measurement accuracy and validation of applicability for testing specific wood properties.
Keywords: ultrasonic, amplitude, resonance, wood modification, dynamic Young’s modulus
Authors
Baltrušaitis A.
Department of Wood Mechanical Technology, Kaunas University of Technology, Kaunas, Lithuania
Ukvalbergiene K.
Department of Wood Mechanical Technology, Kaunas University of Technology, Kaunas, Lithuania
Pranckevičiene V.
Department of Wood Mechanical Technology, Kaunas University of Technology, Kaunas, Lithuania
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