A computational method for crack growth in glulam under variable humidity

Antonio Lorenzo Mendicino, Stefania Fortino, Maximilian Henning, Gerhard Dill-Langer

    Research output: Contribution to conferenceConference articleScientificpeer-review


    This paper presents a three-dimensional orthotropic-viscoelastic model for the analysis of cracked glulam structures under short-term loading or sustained loads. Both conditions of constant and variable humidity are analyzed. Kelvin-type elemental deformations are used for describing the viscoelastic creep and the whole constitutive model is implemented into the Umat user subroutine of Abaqus FEM code. The crack growth simulation under short-term loading is done by using a suitable exponential damage law and the cohesive elements of Abaqus in the fracture process zone. The proposed computational approach is validated by analyzing glued laminated (glulam) specimens under opening mode and the numerical load-displacement curves are compared with both literature results and experimental data obtained in the context of the present research. For long-term fracture tests under sustained loads and constant moisture content, a criterion of crack initiation based on a viscoelastic integral parameter is also introduced. Both the proposed constitutive model and the computational approach can be further extended to cases of crack propagation in the presence of variable humidity conditions.
    Original languageEnglish
    Number of pages9
    Publication statusPublished - 2010
    MoE publication typeNot Eligible
    Event11th World Conference on Timber Engineering, WCTE 2010 - Riva del Garda, Italy
    Duration: 20 Jun 201024 Jun 2010
    Conference number: 11


    Conference11th World Conference on Timber Engineering, WCTE 2010
    Abbreviated titleWCTE 2010
    CityRiva del Garda


    • Mode I and Mode II crack growth
    • glulam
    • cohesive elements
    • moisture-stress analysis
    • J integral
    • FEM
    • Abaqus


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