VSE knjižnice (vzajemna bibliografsko-kataložna baza podatkov COBIB.SI)
  • Sorptive stress estimation: an important key to the mechano-sorptive effect in wood
    Houška, Mladen ; Koc, Pino
    ǂThe ǂmechano-sorptive effect (MSE) can be classified as a very interesting, but not yet completely explained phenomenon of wood behaviour. We therefore decided to try to discover its most relevant ... mechanisms, by conducting two independent series of measurements: accurate measurements of bending deflections on small, clear specimens of spruce wood in changeable climate conditions; and average moisture content (MC) in three parts of the cross-section of unloaded dummy samples. The paper emphasises on the sorptive part of MSE. A computer simulation of the wetting experiment is done to determine the space and time-dependent MC field in the cross-section of the sample. Using a so-called inverse problem identification method, where the equivalence of the computed and measured responses of the numerical model and real sample is imposed, we identified unknown material properties. The solution of the inverse problem enabled us simultaneously to estimate the moisture diffusion coefficients and to determine the MC field. Two kinds of boundary conditions were used in simulations. To estimate the magnitude of sorption stresses a numerical analysis using Finite Element Method (FEM) was done. The sorptive stresses resulting from the nonhomogeneous MC distribution in the sample were obtained. The decisive factor is the gradient of moisture content and resulting sorptive stresses must be taken into account because their magnitude is of the same order as the load induced bending stresses. Our experiments and the calculations following enabled us to conclude that the reason for MS behaviour could be the simultaneous action of permanent load stresses and the transient triaxial sorptive stress state.
    Vir: Mechanics of time-dependent materials : an international journal devoted to the time-dependent behaviour of materials and structures. - ISSN 1385-2000 (Vol. 4, no. 1, 2000, str. 81-98)
    Vrsta gradiva - članek, sestavni del
    Leto - 2000
    Jezik - angleški
    COBISS.SI-ID - 3749659

    Povezava(-e):

    http://dx.doi.org/10.1023/A:1009897822196

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