Computational model for strength analysis of spruce wood

Čeprav je les v uporabi že od pradavnine, je splošno razumevanje njegovega mehanskega obnašanja zelo skromno. V magistrskem delu je na osnovi rezultatov izvedenih statičnih in dinamičnih tri-točkovnih upogibnih preizkusov, bil določen materialni model smrekovega lesa. Vrednosti statičnih materialnih parametrov so bile določene s postopkom inverzne določitve, ki temelji na zaporednem izvajanju numeričnih simulacij. Na osnovi rezultatov dinamičnih upogibnih preizkusov je bila določena enačba S-N krivulje, na osnovi katere je bila potrjena S-N krivulja, pridobljena z numeričnimi simulacijami. Končen rezultat je bil razvit in potrjen materialni model, s katerim je mogoče predvideti odziv komponent iz smrekovega lesa izpostavljenih statični obremenitvi in napovedati njihovo življenjsko dobo pri cikličnem utripnem obremenjevanju v tangencialni orientaciji lesnih vlaken.Even though wood has been used for ages, the general understanding of its mechanical properties is sparse at best. In this master thesis, material model for spruce wood was calculated based on acquired results from static and dynamic three-point bending tests. Values of static material parameters were calculated with the process of inverse determination, which is based on sequential calculation of numerical simulations. Based on results of dynamic bending tests the equation of S-N curve was proposed, which was later used to validate the S-N curve acquired from results of numerical simulations. In the end a material model was proposed, which can be used to predict response of components made from spruce wood while subjected to static loading, and to predict the number of load cycles to material failure for components that are subjected to periodic pulsating loading in tangential orientation of wood fibres