This paper presents results of fracture toughness tests on DCB specimens made of natural and modified pine wood. The energy release coefficients Gα were calculated for both the materials under TL and RL crack propagation modes and the 1st mode of loading. Relations between the energy release coeffcients GαI and the stress intensity factors KαI have been determined. The obtained test results are presented in the form of tables and diagrams
Institute of Basic Engineering, Faculty of Mechanical and Electrical Engineering, Polish Naval Academy in Gdynia, Smidowicza 69, 81-103 Gdynia, Poland
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