Abstract
Heating by solid fuels, and especially fi re wood, belongs to the most asked and requested types of heating in cottages. One of the main problems of heating is wood splitting as a fi rst operation. A very useful tool for splitting of wood material is a log splitter. This contribution is focused on how to apply a screw type log splitter in wood splitting. A set of experiments have been realized to get an appropriate shape of the splitting cone, which will provide an improved splitting action. The cone has been manufactured on the basis of the experimental results. The experimental apparatus has been developed to determine the validity of the splitting cone and its geometry design.
Highlights
A set of experiments have been realized to get an appropriate shape of the splitting cone, which will provide an improved splitting action
The experimental apparatus has been developed to determine the validity of the splitting cone and its geometry design
This contribution deals with the design and construction of a log splitter
Summary
Wood is an important natural resource, one of the few that are renewable. It is prevalent in our everyday lives and economy, in wood-frame houses and furniture; fence posts and utility poles or fire wood. The work of Griffith (Griffith, 1921) proved that cracks and defects dictate the strength of material more than any other single feature He arrived at a formula for the fracture stress:. The attainment of a critical stress intensity factor at fracture is the same as satisfying an energy-based criterion determined from the integrated stress and strain fields around the crack and in the body generally. The fracture properties of different hard- and softwood species have been characterized by the wedge splitting technique (Tschegg, 1986) as a rather new fracture mechanical method and were correlated with the resulting fracture morphology With this method, the fracture toughness KIC, and the specific fracture energy Gf needed to completely separate a specimen, has been determined. Several parameters, which do determine the mechanical, and the fracture properties, have been studied (Stanzl-Tschegg, 2006)
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