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CUTTING TEST AS SOURCE OF FRACTURE TOUGHNESS AND SHEAR YIELD STRENGTH FOR AXIAL-PERPENDICULAR MODEL OF WOOD CUTTING

Luďka Hlásková, Zdeněk Kopecký, Aleš Solař, Zdeněk Patočka

Abstract


The objective of this study was to develop and design a model of calculation of fracture parameters for axial-perpendicular model of wood cutting. Two selected wood species of Central Europe provenance spruce (Picea abies L.) and beech (Fagus sylvatica L.) of two different levels of moisture content (w = 8% and 16%) were sawn. The measurements of energetic effects (cutting power and cutting force) while sawing wood were carried out on the laboratory stand which simulates conditions of circular saw blade cutting. Using the newly designed model, it is possible to determine fracture toughness and shear yield strength only on the basis of the cutting tests. Unknown parameters, which are then applied in the model, were set based on calculation of the forces acting on the workpiece and the tool. Using the measured cutting force and the feed force, other component of the resulting active force were calculated. The computation was based on Ernst-Merchant’s force decomposition diagram. Results confirmed the obvious influence of the anatomical structures and moisture content on the size of fracture parameters.


Keywords


fracture toughness; shear yield strength; wood cutting; circular saw blade; cutting test

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