INVESTIGATION OF THE Z-DIRECTION STRENGTH PROPERTIES OF PAPER BY USE OF ACOUSTIC EMISSION MONITORING

In the quality assessment of paper, a standard test referred to as the Z-test is often utilised. It consists in gluing a piece of paper between two circular metallic grips and loading it with a tensile load in the thickness direction of the paper. The fracture load or rather the maximum load the pap...

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Bibliographic Details
Published in:Journal of acoustic emission 2008-01, Vol.25
Main Authors: Norgren, S, Gradin, P A, Nystrom, S, Gullikson, M
Format: Article
Language:English
Online Access:Get full text
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Summary:In the quality assessment of paper, a standard test referred to as the Z-test is often utilised. It consists in gluing a piece of paper between two circular metallic grips and loading it with a tensile load in the thickness direction of the paper. The fracture load or rather the maximum load the paper specimen can withstand is then taken as a measure of the Z-direction strength of the paper tested. The interpretation of the results and how to use the results has been and still is a question of some controversy. To shed some light over the deformation or damage processes active when a paper is loaded in the thickness direction, specially designed grips were developed and manufactured. The grips are designed in such a way that they admit that acoustic emission (AE) sensors are mounted in the grips. In this paper, the method is presented together with a simple analytical model, relevant for the Z-test. Also, some experimental results are given and it is concluded that the analytical model can, at least in a qualitative way, predict not only the load versus displacement behaviour but also the total number of AE events versus displacement relation.
ISSN:0730-0050