Miran Merhar (Author), Bojan Bučar (Author)

Abstract

In the present study, the conditions of chip propagation or fracture in orthogonal oblique cutting of beech wood (Fagus silvatica) in the 90° direction for a type-I chip has been investigated. The force required for orthogonal wood cutting is pronouncedly variable, which is the consequence of exchangeable different ways of material breakdown. The chip formation process is discontinuous because of interrupted splitting of the material in front of the cutting tool. A 10-mm-thick specimen was cut at a rake angle of 31° and 42° with chip thicknesses ranging from 0.1 to 0.3 mm. The chip segment length increased with the chip thickness. A chip of varying length and thickness was modelled using the finite element method. For each case, the bending or compressive stress in the chip and the stress intensity factor at the crack tip was calculated. The segment length of the chip can be calculated by taking into account the condition that a crack propagates when the stress intensity factor K I at the crack tip equals the critical stress intensity factor K IC, and the bending or compressive stress sigma x in the chip is smaller than the strength sigm u . Good agreement between the calculated and the measured values was observed. The chip segment length can change considerably already with small changes in the bending strength and critical stress intensity factor. This large sensitivity is also confirmed by the fluctuation of the measured chip segment lengths by as much as 400%.

Keywords

odrezek;segmentacija odrezka;formiranje odrezka;fraktura;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL BF - Biotechnical Faculty
UDC: 630*8
COBISS: 1989001 Link will open in a new window
ISSN: 0043-7719
Views: 902
Downloads: 217
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Other data

Secondary language: English
Type (COBISS): Not categorized
Pages: str. 965-977
Volume: ǂVol. ǂ46
Issue: ǂissue ǂ5
Chronology: 2012
DOI: 10.1007/s00226-011-0457-4
ID: 1033442