izpis_h1_title_alt

Cutting force variability as a consequence of exchangeable cleavage fracture and compressive breakdown of wood tissue
Merhar, Miran (Author), Bučar, Bojan (Author)

URLURL - Presentation file, Visit http://www.springerlink.com/content/f6j2l58726854ru7/fulltext.pdf This link opens in a new window

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%.

Language:English
Keywords:odrezek, segmentacija odrezka, formiranje odrezka, fraktura
Work type:Not categorized (r6)
Tipology:1.01 - Original Scientific Article
Organization:BF - Biotechnical Faculty
Year:2012
Number of pages:str. 965-977
Numbering:Vol. 46, issue 5
UDC:630*8
ISSN on article:0043-7719
DOI:10.1007/s00226-011-0457-4 Link is opened in a new window
COBISS.SI-ID:1989001 Link is opened in a new window
Views:507
Downloads:127
Metadata:XML RDF-CHPDL DC-XML DC-RDF
 
Average score:(0 votes)
Your score:Voting is allowed only to logged in users.
:
Share:AddThis
AddThis uses cookies that require your consent. Edit consent...

Record is a part of a journal

Title:Wood Science and Technology
Shortened title:Wood Sci. Technol.
Publisher:Springer
ISSN:0043-7719
COBISS.SI-ID:9151749 This link opens in a new window

Similar documents

Similar works from RUL:
Similar works from other Slovenian collections:

Comments

Leave comment

You have to log in to leave a comment.

Comments (0)
0 - 0 / 0
 
There are no comments!

Back