COST Action 508

European Commission Directorate-General For Research And Innovation

Description

Wood mechanics: Workshop on mechanical proprieties of panel products, 22 and 23 March 1995 Building Research Establishment, Watford, UK
Industrial research and development

Informations

• Publié par: EUROPEAN-COMMISSION-DIRECTORATE-GENERAL-FOR-RESEARCH-AND-INNOVATION
• Nombre de lectures: 29
• EAN13: 928277340
• Langue: English
• Poids de l'ouvrage: 11 Mo

Extrait

ISSN 1018-5593
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COST Action 508
wood mechanics
Workshop on
mechanical properties of
panel products
22 and March 1995
Building Research Establishment
Watford, UK
EUR 16845 EN The cover image shows a sample of oriented strand board, cut perpendicular to main axis
of the board, being subjected to constant load in a 4-point bending creep test rig and the
centrally placed linear variable displacement transducer. European Commission
Directorate-General XII
Science Research and Development
COST Action 508
wood mechanics
Workshop on
mechanical properties of
panel products
22 and 23 March 1995
Building Research Establishment
Watford, UK
Edited by
Ρ W Bonfield
J M Dinwoodie
J S Mundy
1996 EUR 16845 EN Published by the
EUROPEAN COMMISSION
Directorate-General XII
Science, Research and Development
B-1049 Brussels
LEGAL NOTICE
Neither the European Commission nor any person acting
on behalf of the Commission is responsible for the use which might be made of
the following information
Cataloguing data can be found at the end of this publication
Luxembourg: Office for Official Publications of the European Communities, 1996
ISBN 92-827-7340-X
© ECSC-EC-EAEC, Brussels · Luxembourg, 1996
Reproduction is authorized, except for commercial purposes,
provided the source is acknowledged
Printed in Italy COST 508 WOOD MECHANICS
Workshop on
MECHANICAL PROPERTIES OF
PANEL PRODUCTS
22/23 MARCH 1995
BUILDING RESEARCH ESTABLISHMENT
WATFORD, UK.
CONTENTS
PREFACE
Identified research requirements from the Workshop
PW Bonfield & JM Dinwoodie
SESSION 1: CREEP & DURATION OF LOAD
Recent European research on the rheological behaviour of wood based panels 2
JM Dinwoodie & PW Bonfield
Duration of load properties of LVL made of Sitka spruce 39
Ρ Hoffmeyer & M Vestergaard
Creep behaviour of plywood with low contentofformaldehyde49
C Boehme
Creep behaviour of glued thin­webbed I­beams 69
JF Bocquet, A Bouchair, JC Faugeras&ΡRacher
Effect of moisture on short­term properties,creep&long­term strength of83
plywood slabs
S Koponen & I Saavalainen
Creep & DOL behaviour of OSB under controlled indoor environment: effect 102
of stress level
RC Tang, JN Lee & JH Pu
Creep in chipboards under bending, compression & shear loads 110
IR Kliger
Mechanosorptive effect deformation of thin wood specimensingraindirection 127
Ρ Navi & V Pittet
Computational analysis of factors affecting the bending DOL behaviour of LVL 141
A Hanhijärvi & A Ranta­Maunus
III Creep in bending of sandwich beams with a wooden core - some modelizations 153
of experimental results
J Launay & JL Nieto
Tension & compression creep of particleboard as serviceability limit of stress- 160
skin elements
S Aicher , G Dill & S Brunold
SESSION 2: STRENGTH & STIFFNESS
Plywood mechanical design: predictive modelling & characterization 187
D Guitard
The shear strength of lightweight beams with & without a hole - a preliminary 198
study
V Morris, PJ Gustafsson & E Serrano
Effects of veneer thickness & adhesive content on strength & stiffness of 215
spruce & birch plywood
I Absetz & Ρ Talaskivi
CEC programme: Design stresses for OSB 233
R Griffiths & HG Wickens
The study of thickness swelling in particleboards by measuring the 271
compressibility & recovery of individually pressed particles
Τ Adcock & M Irle
The influence of wood preservative treatments on the mechanical strength of 285
plywood
J Van Acker & M Stevens
Mechanical properties of laminated veneer lumber in different loading 303
directions
M Lehtinen
SESSION 3: FATIGUE & FRACTURE
Effect of frequency on the fatigue response of structural grade chipboard 321
RJ Thompson, PW Bonfield, MP Ansell & JM Dinwoodie
Fracture Mechanics in wood & wood-based panel products at different testing 336
speeds & relative humidities
V Morris, J Adams & D Hunt
Slow, cyclic fatigue of chipboard 352
PW Bonfield, JM Dinwoodie, BH Paxton & JS Mundy
IV Building Research Establishment
PREFACE
SUMMARY OF WORKSHOP AND IDENTIFIED REQUIREMENTS FOR RESEARCH
Ρ Bonfield and JM Dinwoodie.
This was the sixth of a very successful series of Workshops organised by the COST 508
Management Committee which concentrated on the mechanical properties of wood composite
products. Over 50 experts attended from 18 countries, with delegates travelling from as far
as the USA and New Zealand although the majority were from Western Europe.
Workshop format
In order to encourage more scientific discussion the format of the Workshop was changed
from those held previously. The Workshop was divided into 3 main scientific themes:
'Creep', 'Strength and Stiffness', 'Fatigue and Fracture'. For each theme, four presentations
of 15 minutes were made during which the speakers were asked to highlight the important
scientific aspects of their work. The aim of this was to help provoke the expert audience into
identifying areas for discussion during the brainstorming sessions held after the presentations.
For the brainstorming sessions the delegates were divided into small groups of 5. Each group
then went through a structured brainstorming procedure, led by group chairmen, that ensured
that each member of the group made useful contribution and that constructive progress was
made by the group as a whole. For each of the 3 main themes, a list of priority issues were
developed under the main subject areas: 'Understanding', 'Testing', and 'Modelling'.
Following the brainstorming procedure all delegates reassembled and each Group Chairman
presented the major conclusions from each brainstorming group.
A final plenary session at the end of the Workshop summarised the main findings for each
of the 3 main themes.
Scientific outcome
The scientific discussion during the brainstorming session was intense and proved to be a very
efficient and productive method for exchanging ideas and information, developing new
approaches to understanding, testing and modelling performance, and identifying future
priority work areas. A summary list of the major identified requirements for research has been
compiled which is an important tool for researchers to identify and propose future projects
that best reflect the research needs of panel products.
The 21 papers published in the proceedings will also act as a comprehensive review of the
state of the art of research in the area of the mechanical performance of panel products.
June 1995 Building Research Establishment
Garston
Watford WD2 7JR
Tel [phone] IDENTIFIED REQUIREMENTS
Session 1 - Creep and duration of load