@inproceedings{d793757570cb41ef81c3d109c9c43c85,
title = "Assessment of local timber defects during testing and grading as influenced by machine approval procedure",
abstract = "Depending on the utilised principle, many grading machines are only able to measure an average property of the board, for example density or longitudinal eigenfrequency. Other grading machines on the market are able to detect local weaknesses such as knots and therefore try to locate the weakest cross section. The basis for the derivation of settings is a comparison between data of the laboratory and data from the grading machine. A regression model is created containing the machine parameters, which provide the best fit between indicating properties and grade determining properties. If the grading machine detects knots, the maximum knot value between the inner load points (bending test) is used for developing a model. This maximum knot value is also used for deriving settings. It is obvious, that it is not always possible to choose the maximum knot value of the entire board. Consequently, the very same board is assigned to a lower indicating property during testing than during grading in practise.",
keywords = "Bending test, Knots, Length effect, Local weakness, Machine grading",
author = "Andreas Rais and Peter Stapel and {Van De Kuilen}, {Jan Willem}",
year = "2010",
language = "English",
isbn = "9781622761753",
series = "11th World Conference on Timber Engineering 2010, WCTE 2010",
pages = "300--304",
booktitle = "11th World Conference on Timber Engineering 2010, WCTE 2010",
note = "11th World Conference on Timber Engineering 2010, WCTE 2010 ; Conference date: 20-06-2010 Through 24-06-2010",
}