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An end-notched beam test for specific fracture energy in mixed mode in timber

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Abstract

A simple method for achieving stable crack propagation in a beam notched at a support is presented. The method allows the measurement of fracture energy in mixed modeG f,mix. Results from a small number of laminated veneer lumber specimens suggest that there is a relationship betweenG f,mix and density and that the ratioG f,mix/(G f,I+G f,II) is about 0.35. Calculations of fracture energy in mode IG f,I and mode, IIG f,II did not coincide with values from mode-specific tests, indicating that an adjustment is necessary to take account of the interaction between the modes.

Résumé

Est ici présentée une méthode simple visant à assurer progressivement la fissure d’une poutre entaillée à son extrémité sur un support. Cette méthode permet de mesurer l’énergie de rupture en mode mixte G f,mix . Les résultats obtenus à partir de quelques spécimens de bois de placage laminés, suggèrent qu’il existe une relation entre G f,mix et la densité, et que la proportion G f,mix /(G f,l +G f,II ) est d’environ 0,35.

Les calculs de la mesure de l’énergie de rupture en mode I G f,I et en mode II G f,II ne coïncidaient pas avec les valeurs issues d’essais en mode individuel, ce qui semble indiquer qu’un rajustement est nécessaire en raison d’une interaction entre les modes.

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References

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Authors and Affiliations

  1. Forest Products Research Centre, Buckinghamshire Chilterns University College, High Wycombe, UK

    H. D. Mansfield-Williams

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  1. H. D. Mansfield-Williams
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Mansfield-Williams, H.D. An end-notched beam test for specific fracture energy in mixed mode in timber. Mat. Struct. 34, 224–227 (2001). https://doi.org/10.1007/BF02480592

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  • DOI: https://doi.org/10.1007/BF02480592

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