Fracture behaviour of laminated veneer lumber under Mode I and III loading |
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| Authors: | K Frühmann E K Tschegg C Dai S E Stanzl-Tschegg |
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| Institution: | 1.Christian Doppler Laboratory for Fundamentals of Wood Machining at the Institute of Meteorology and Physics, University of Agricultural Sciences, Türkenschanzstra?e 18, 1180 Vienna, Austria e-mail: Klaus.fruchmann@ifp.tuwien.ac.at,AT;2.Intitute of Applied and Technical Physics, Vienna University of Technology, Wiedner Hauptstra?e 8–10, 1040 Vienna, Austria,AT;3.Forintek Canada Corp, 2665 East Mall, Vancouver, British Columbia, Canada, V6T 1W5,CA |
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| Abstract: | Mode I and Mode III loading experiments were performed on side grooved CT specimens of two types of Laminated Veneer Lumber
(LVL). Steady state crack propagation was maintained in order to detect complete load displacement diagrams. Fracture behaviour
and influence of fiber orientation were studied and all important fracture mechanical values (stiffness/compliance, microstructural
damage, crack initiation energy, specific fracture energy etc) were determined. Much higher crack initiation energies and
specific fracture energies resulted in mode III loading than in mode I loading for both material types. Under external mode
III loading, crack initiation occurs in mode III and crack propagation however takes place under mode I owing to crack surface
interference. The influence of fiber orientation on fracture mechanical properties of LVL was discussed.
Received 15 September 1999 |
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