The main objective of this thesis was to improve the understanding of some aspects on wood and fibre mechanics related to conditions in the thermomechanical pulping process. Another objective was to measure the power distribution between the rotating plates in a refiner. The thesis comprises the following parts: – A literature review aimed at describing fracture in wood and fibres as related to...

Structural, thermomechanical, and dynamic properties of pure silica SiO2 are calculated with three different model potentials, namely, the potential suggested by van Beest, Kramer, and van Santen (BKS) [Phys. Rev. Lett. 64, 1955 (1990)], the fluctuating-charge potential with a Morse stretch term for the short-range interactions proposed by Demiralp, Cagin, and Goddard (DCG)[Phys. Rev. Lett. 82,...

A technique is presented for hardening metal products, in particular, the main tools (hammers) and cases of core drilling bits made steel 30HGSA, using thermomechanical surface treatment according to a separate scheme. The method combined laser used study consists use shot peening followed by heat treatment. Its makes it possible increase operational properties their wear corrosion resistance. ...