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Moisture-induced damage evolution in laminated beech

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Abstract

In a combined experimental, numerical, and analytical approach, damage onset and propagation in unidirectional and cross-laminated samples from European beech due to climatic changes are studied. The inter- and intra-laminar damage evolution is characterized for various configurations, adhesively bonded by three structural adhesive systems. Different lamella thicknesses are studied to capture size effects. Typical situations are simulated by means of a comprehensive moisture-dependent nonlinear rheological finite element model for wood with the capability to capture delaminations. The simulations give insight into the role of different strain components such as viscoelastic, mechano-sorptive, plastic, and hygro-elastic deformations under changing moisture content in progressive damage and delamination. The stress buildup under cyclic hygric loading was shown, resulting in hygro-fatigue. It was demonstrated that a modified analytical micro-mechanics of damage model, originally developed for cross-ply laminates, can be employed to describe the problem of moisture-induced damage in beech lamellae.

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Acknowledgments

This work was funded by the Swiss National Science Foundation in the National Research Programme NRP 66—Resource Wood under Grant No. 406640-140002: Reliable timber and innovative wood products for structures.

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Authors and Affiliations

  1. Institute for Building Materials, Department of Civil, Environmental and Geomatic Engineering, ETH Zurich, Stefano-Franscini Platz 3, 8093, Zurich, Switzerland

    Mohammad Masoud Hassani, Falk K. Wittel, Samuel Ammann, Peter Niemz & Hans J. Herrmann

Authors
  1. Mohammad Masoud Hassani
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  2. Falk K. Wittel
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  3. Samuel Ammann
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  4. Peter Niemz
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  5. Hans J. Herrmann
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Correspondence to Falk K. Wittel.

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Hassani, M.M., Wittel, F.K., Ammann, S. et al. Moisture-induced damage evolution in laminated beech. Wood Sci Technol 50, 917–940 (2016). https://doi.org/10.1007/s00226-016-0821-5

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  • DOI: https://doi.org/10.1007/s00226-016-0821-5

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