TY - GEN
T1 - Brittleheart as a critical feature for visual strength grading of tropical hardwood - Approach of detection
AU - Kuisch, Hanna
AU - Gard, Wolfgang
AU - Botter, Erik
AU - Van De Kuilen, Jan Willem
PY - 2012
Y1 - 2012
N2 - Brittleheart is a well-known phenomenon in many tropical wood species which reduces the strength properties considerably. According to national strength grading standards such as BS 5756 and NEN 5493, timber with brittleheart has to be rejected. In many cases, however, brittleheart is not visible on the outer surface and the cross section of sawn timber. This investigation has been focused on qualitative characterisation of compression failures in tropical hardwood in conjunction with non-destructive detection methods. Five grades of compression failures have been characterised by deformation and displacement of wood tissue. Preliminary results show that CT-scanning is a promising technique for detecting the defined grades. However, limitation of detection is due to the resolution of the scanners and contrast ability of imaging. Quantitative studies of brittleheart on mechanical properties are continuing.
AB - Brittleheart is a well-known phenomenon in many tropical wood species which reduces the strength properties considerably. According to national strength grading standards such as BS 5756 and NEN 5493, timber with brittleheart has to be rejected. In many cases, however, brittleheart is not visible on the outer surface and the cross section of sawn timber. This investigation has been focused on qualitative characterisation of compression failures in tropical hardwood in conjunction with non-destructive detection methods. Five grades of compression failures have been characterised by deformation and displacement of wood tissue. Preliminary results show that CT-scanning is a promising technique for detecting the defined grades. However, limitation of detection is due to the resolution of the scanners and contrast ability of imaging. Quantitative studies of brittleheart on mechanical properties are continuing.
KW - Brittleheart
KW - CT scanning
KW - Compression failures
KW - Morphological characteristics
KW - Tropical hardwood
UR - http://www.scopus.com/inward/record.url?scp=84871982560&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:84871982560
SN - 9781622763054
T3 - World Conference on Timber Engineering 2012, WCTE 2012
SP - 20
EP - 29
BT - World Conference on Timber Engineering 2012, WCTE 2012
T2 - World Conference on Timber Engineering 2012: Timber Engineering Challenges and Solutions, WCTE 2012
Y2 - 15 July 2012 through 19 July 2012
ER -