NDLI: Wood polymer composites versus thermally treated wood versus wood: cyclic testing

Content Provider	Springer Nature Link
Author	Haider, Andreas Reitberger, Michael Leßlhumer, Jürgen Plank, Bernhard Müller, Ulrich
Copyright Year	2014
Abstract	In diesem Artikel wird die Dauerhaftigkeit von Terrassendielen aus verschiedenen Materialien bezüglich der Standfestigkeit während eines Zyklustests untersucht. Als Vergleichsmaterialien wurden Terrassendielen aus diversen Hölzern, thermisch modifiziertem Holz (TMT) und Wood-Polymer-Composites (WPC) verwendet. Als Grundlage für die Festlegung der Temperaturen für die Biegeprüfung nach EN 310 an Profilen wurden die Oberflächentemperaturen der Dielen an einem durchschnittlich heißen Sommertag gemessen. Alle Proben wurden dann einem Zyklustest nach EN 321 unterzogen und die Biegeprüfung bei unterschiedlichen Temperaturen wiederholt. Alle Holzdielen wiesen danach deutlich sichtbare Risse auf und einige waren verzogen oder gebrochen. Die Holzdielen zeigten bezüglich der optischen Erscheinung Vorteile gegenüber den Thermohölzern. Einige WPC-Dielen wiesen stirnseitig sehr feine Risse auf, welche zusätzlich mittels Röntgen-Computertomografie (CT) analysiert wurden. Bis auf jene WPC-Diele mit höherem Holzanteil zeigten sich an den WPC-Dielen keine bedeutenden Änderungen nach dem Zyklustest. Die CT-Analyse zeigte, dass die WPC-Diele mit höherem Holzanteil im Inneren mehrere feine Risse über die ganze Probe aufwies. Diese Fehlstellen lassen sich über das ganze Volumen deutlich zeigen und darstellen, wodurch die Gesamtschädigung sichtbar wird. Bei WPC wurden keine Oberflächenrisse beobachtet.This article deals with the differences in the long-term durability and thermal stability under load of terrace deckings from various materials. The tested materials were deckings made of wood, thermally modified timber (TMT), and wood–polymer–composites (WPC). For the determination of the test temperatures for component testing according to EN 310, the surface temperatures of the decks during a normal hot summer day were measured. A cyclic test according to EN 321 was applied to all decking materials. Afterwards the component testing was repeated. All wooden samples reveal considerable cracks, some were twisted, and few were even broken. In particular regarding the optical appearance, wood decks show advantages against the TMT decks. Some WPC decks show very fine cracks on the face, which were additionally analyzed by means of X-ray computed tomography (CT). Except for the WPC deck with higher wood content, no WPC deck revealed significant changes after the cyclic test. The CT analysis was also suitable to find cracks inside the materials and illustrate them. Thus, the whole damage inside a sample could be characterized by calculating a kind of error pattern. No considerable cracks or failures could be observed on the WPC decks.
Starting Page	815
Ending Page	823
Page Count	9
File Format	PDF
ISSN	00183768
Journal	Holz als Roh- und Werkstoff
Volume Number	72
Issue Number	6
e-ISSN	1436736X
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-08-29
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Wood Science & Technology Ceramics, Glass, Composites, Natural Methods Operating Procedures, Materials Treatment
Content Type	Text
Resource Type	Article
Subject	Materials Science Forestry

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