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A proposed mixed-mode fracture specimen for wood under creep loadings

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Abstract

A mixed-mode fracture specimen was designed in this paper. This geometry is a judicious compromise between a modified Double Cantilever Beam specimen and Compact Tension Shear specimens. The main objective is to propose a specimen which traduces a stable crack growth during creep loading taking into account viscoelastic behaviour under mixed-mode loadings. The numerical design is based on the instantaneous response traduced by a crack growth stability zone. This zone is characterized by a decrease of the instantaneous energy release rate versus the crack length. In order to obtain a mixed-mode separation, the paper deals with the use of the M-integral approach implemented in finite element software, according to energetic fracture criterions. In these considerations, a numerical geometric optimization is operated for different mixed-mode ratios. Finally, a common specimen which provides to obtain fracture parameters, viscoelastic properties and creep crack growth process for different mixed-mode configurations is proposed.

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Authors and Affiliations

  1. Clermont Université, Université Blaise Pascal, Laboratoire de Mécanique et Ingénieries, EA 3867, BP 206, 63000, Clermont Ferrand, France

    Rostand Moutou Pitti

  2. Université de Limoges, GEMH-GCD, Centre Universitaire Génie Civil, Bd Jacques Derche, 19300, Egletons, France

    Frédéric Dubois & Octavian Pop

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  1. Rostand Moutou Pitti
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  2. Frédéric Dubois
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  3. Octavian Pop
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Correspondence to Rostand Moutou Pitti.

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Moutou Pitti, R., Dubois, F. & Pop, O. A proposed mixed-mode fracture specimen for wood under creep loadings. Int J Fract 167, 195–209 (2011). https://doi.org/10.1007/s10704-010-9544-z

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  • DOI: https://doi.org/10.1007/s10704-010-9544-z

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