Several approaches have been taken to compare modulus of elasticity MOE and resulting modulus of rupture MOR determined using different testing principles and methods. Those included two approaches of long span bending method, amplitude resonance (dynamic MOE and MOR) method, and industrial Metriguard machine stress rating method. Non-destructive testing results were verified with standard bending testing MOR for validation received models describing Lithuanian grown pine strength and modulus of elasticity interrelations. Nominal specimens sizes were 3006 x 90 x 35 mm. Variable factors were specimen density (400-650 kg/m3) and moisture content (10-18 %). Comparisons of different test methods on sawn timber strength-stiffness properties revealed moderate differences of distribution into strength classes (yield) when grading under various stress rating methods.
Keywords: sawn timber, non-destructive methods, strength, stiffness
Authors
Mišeikyte S.
Department of Mechanical Wood Technology , Kaunas University of Technology, Kaunas, Lithuania
Baltrušaitis A.
Department of Mechanical Wood Technology, Kaunas University of Technology, Kaunas, Lithuania
Kudakas L.
Alytus Sawmill UAB “Stora Enso Timber”, Alytus, Lithuania
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