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    Author(s): Joseph E. JakesCharles R. Frihart; Donald S. Stone
    Date: 2009
    Source: Materials Research Society Symposium proceedings. Vol. 1132. [S.l. : s.n.], c2009: [6] pages.
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (1.59 MB)

    Description

    The hardnesses of secondary cell wall laminae (SCWL) and compound corner middle lamellae (CCML) in wood were measured at indentation strain rates between approximately 7×10-4 s-1 and 20 s-1, using a new method called broadband nanoindentation creep. The wood was subsequently modified with ethylene glycol (EG) and the properties were re-measured. The SCWL and CCML responded differently to this modification: in the SCWL, hardness decreased uniformly by a factor of 3.7 ± 0.3 across all strain rates, whereas in CCML, the modification had a similar effect at low strain rates. However, at high strain rates, hardness was only lowered by a factor of 1.8. The EG modification also lowered elastic modulus of the SCWL and CCML, swelled the SCWL and CCML, and caused previously placed indents to disappear (CCML) or partly disappear (SCWL).

    Publication Notes

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    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Jakes, Joseph E.; Frihart, Charles R. Stone, Donald S. 2009. Creep properties of micron-size domains in ethylene glycol modified wood across 4½ decades in strain rate. In: Katti, K; Hellmich, C.; Wegst, U.G.K.; Narayan, R., eds. Mechanics of biological and biomedical materials. Materials Research Society symposium proceedings. Warrendale, PA: Paper No. 1132-Z07-21. Vol. 1132.

    Keywords

    Loblolly pine, mechanical properties, ethylene glycol, hardness, nanotechnology, nanostructured materials, measurement, strains, stresses, wood, creep, plant cell walls, preservation, deterioration, elasticity, modulus of elasticity, deformations, nanoindentation, broadband nanoindentation creep, modified wood, chemical modification of wood, preservation

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