First WG2 Meeting Hygro-mechanical properties improving qualification of young researchers Secondary

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  • Action FP0802

    First WG2 Meeting Hygro-mechanical properties

    Michaela Eder – Olivier Arnould

  • Action FP0802

    Outline

    • Reminder of the objectives of the WG2 • Presentations: who’s who? Break

    • Discussion about joined action, organisation, etc.

  • Action FP0802

    1st�WG2�meeting�– Vienna,�May�13,�2009

    Main/ primary objectives

    To increase the understanding of the wood micro-structure and micromechanics by exploring and evaluating emerging techniques in the fields of physics, chemistry, materials and computer science in order to provide a strong basis for the development of innovative wood-based products in the future and for enhancing the use of the natural resource wood.

    � Bringing together experimental and computational methods for a better understanding and higher predictability of wood properties!

  • Action FP0802

    1st�WG2�meeting�– Vienna,�May�13,�2009

    Secondary objectives � Improvement of knowledge base by

    � deepening understanding of microstructural origin of mechanical behaviour � formulating physically motivated material models � identifying hygro-mechanical properties of wood and its ultrastructural

    components

  • Action FP0802

    1st�WG2�meeting�– Vienna,�May�13,�2009

    � Improvement of knowledge base

    � Establishment of consolidated basis for future research activities and structuring of the research area by

    � identifying and promoting new promising measuring and assessment techniques � defining goals and coordinating new national and (extra?)European research activities � establishing an active communication network and strengthening cooperation � stimulating new research projects at the European level � spreading knowledge of experimental techniques � improving qualification of young researchers

    Secondary objectives

  • Action FP0802

    1st�WG2�meeting�– Vienna,�May�13,�2009

    � Improvement of knowledge base

    � Establishment of consolidated basis for future research activities and structuring of the research area

    � Providing the scientific foundation for a knowledge-based forest product industry capable of meeting future demands for innovative products

    Secondary objectives

  • Action FP0802

    1st�WG2�meeting�– Vienna,�May�13,�2009

    WG1 – Wood microstructure Topics: molecular structure of cell wall (incl. bonds), molecular origin of time and moisture dependence of mechanical behaviour

    Methods: microscopic and spectroscopic methods, X-ray techniques, wood modification and mechanical treatment

    Deliverables: deepened understanding of microstructural (molecular) origin of mechanical behaviour, explanatory models

    Molecular structure of cellulose (Chaplin ´07)

    Bleached spruce fibre (Daniel et al.´07) Distribution of wood polymers

    (Fahlen & Salmén ´05)

    cellulose

    lignin hemicellulose

  • Action FP0802

    1st�WG2�meeting�– Vienna,�May�13,�2009

    WG2 – Hygro-mechanical properties Topics: (micro)structure-function relationships, hygro-thermo- mechanical properties of cell wall and its components, in-situ tests

    Methods: micro-tensile testing, DMA, nano-indentation, SAM, NMR, Dynamic Vapour Sorption, AFM

    Deliverables: hygro-thermo-mechanical properties of wood across several length scales under different environmental conditions

    Micro-tensile testing stage and fibre fracture zone

    (Eder´et al. 07) Nano-indents in wood cell wall (Jäger´06) NMR images of moisture

    distribution (Almeida et al.´08)

    initial state before pressure application

    270 minutes of drainage

  • Action FP0802

    1st�WG2�meeting�– Vienna,�May�13,�2009

    WG3 – Modelling of the material behaviour Topics: multiscale approaches, hygro-thermo-mechanical couplings, inverse parameter identification, virtual testing

    Methods: finite elements, homogenisation techniques, composite micromechanics, molecular dynamics, Monte Carlo simulations

    Deliverables: predictive integrated computer models for hygro- thermo-mechanical behaviour

    Molecular dynamics simulation of simul- taneous drying and shearing (Navi´et al. 02)

    Deformation at compressive loading in R-direction (Ransgri

    et al.´04) Simulation of axially loaded wood

    fibre (Wilhelmsoonet al. ´06)

  • Action FP0802

    1st�WG2�meeting�– Vienna,�May�13,�2009

    WG interactions � iterative process

    AIM: improved knowledge and better (quantitative) models

    WG1: investigation of the wood structure at the sub-micrometre and molecular scale

    Wood cell structure (Sehlstedt´06)WG2: determination of

    hygro-thermo-mechanical properties of wood and its components Stress-strain curve

    fibre (Burgert ´04)WG3: modelling the hygro-thermo-mechanical

    behaviour of wood FE simulation of

    knot (Kaliske ´05)

    Material properties

    Back-calculation, reverse identification

    Structural organisation, sample modification

    Structural features

    identification

  • Action FP0802

    1st�WG2�meeting�– Vienna,�May�13,�2009

    Micro-characterisation techniques

    • fast development of experimental and computational techniques in fields of physics, chemistry, materials science, computer science

    • enormous potential to boost state-of-knowledge in wood mechanics

    � introduction of new techniques into wood sector (e.g. Scanning Acoustic Microscope – SAM, AFM)

    � combination of well-established techniques (e.g. micro-mechanical testing and spectroscopic methods)

    � use of modified wood samples (e.g. enzymatic modification)

    � better control of environmental conditions (e.g. high-precision humidifiers)

  • Action FP0802

    1st�WG2�meeting�– Vienna,�May�13,�2009

    � Efficient use of the emerging techniques, provision for risks (misuse of equipment, misinterpretation of results, etc.) requires:

    Rapid and very broad development, continuous technological modernisation, increasing costs of equipment, increasing need of specialication.

    � close interlinking of researchers

    � joint research activities

    � coordination of research endeavours

    Micro-characterisation techniques

  • Action FP0802

    1st�WG2�meeting�– Vienna,�May�13,�2009

    Example of methods and instruments �mechanical testing [(micro)mechanical testing devices, ultrasonic test equipment,

    nanoindentation, AFM, (Moisture Scanning) DMA, ESPI, Video Image Correlation for 2-D strain field measurement, Video Extensometry, SAM, etc.]

    �microscopic methods [Transmission and Reflected Light Microscopy, ESEM, SEM, Imaging Fourier Transform Infrared (FTIR) Microscopy, AFM, etc.]

    � spectroscopic methods [IR, NIR, (dynamic) FTIR, Raman Spectroscopy; (Low Field) NMR, Ultrasonic Force Modulation Spectroscopy, Micro-Spectroscopy, etc.]

    � biochemical analysis methods [TGA, HPCL, molecular biological methods, etc.] � X-ray scanning techniques [SAXS, WAXS, (Micro)CT, Neutron Radiography/

    Tomography, Synchrotron-Tomography]

    �moisture-related equipment [state-of-the-art moisture measurement equipment, DVS, hygro-thermal cells for mechano-sorptive characterisation, device for measurement of swelling stresses, etc.]

    � computational methods [FEM, homogenisation techniques (Unit Cell Method, Continuum Micromechanics, etc.), composite micromechanics, Molecular Dynamics, Computational Molecular Kinetics, Monte Carlo simulations, etc.]

  • Action FP0802

    Presentations Who’s who!

  • University of Natural Resources and Applied Life Science, Vienna Department of Material Sciences and Process Engineering

    Institute of Wood Science and Technology I Johannes Konnerth

    Institute of Wood Science and Technology

    Department of Material Sciences and Process Engineering

    BOKU University of Natural Resources and Applied Life Sciences – Vienna

    Johannes Konnerth

  • 06.11.2009 2

    University of Natural Resources and Applied Life Science, Vienna Department of Material Sciences and Process Engineering

    Institute of Wood Science and Technology I Johannes Konnerth

    Scales in Wood-Adhesive bonds

    50 mm

    5 mm

    50 μm

    5 μm

  • 06.11.2009 3

    University of Natural Resources and Applied Life Science, Vienna Department of Material Sciences and Process Engineering

    Institute of Wood Science and Technology I Johannes Konnerth

    Research interests

    � Mechanic characterization techniques from macro to micro scale e.g. ESPI, Nanoindentation � Wood � Wood adhesive bonds � Wood based materials

  • 06.11.2009 4

    University of Natural Resources and Applied Life Science, Vienna Department of Material Sciences and Process Engineering

    Institute of Wood Science and Technology I Johannes Konnerth

    Equipment

    � Mechanical Testing 2 Universal testing machines Range: from single fiber to macroscopic wood specimens

    � Strain measurement Mechanical Ex