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Creep properties of micron-size domains in ethylene glycol modified wood across 4½ decades in strain rate

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Abstract

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).

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Authors and Affiliations

  1. Materials Science Program, University of Wisconsin-Madison, 1509 University Ave., 53706, Madison, WI, USA

    E. Jakes Joseph & S. Stone Donald

  2. U.S. Forest Service, Forest Products Laboratory, One Gifford Pinchot Dr., 53726, Madison, WI, USA

    E. Jakes Joseph & R. Frihart Charles

  3. Department of Materials Science and Engineering, University of Wisconsin-Madison, 1509 University Ave., Madison, WI, USA

    S. Stone Donald

Authors
  1. E. Jakes Joseph
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  2. R. Frihart Charles
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  3. S. Stone Donald
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Correspondence to E. Jakes Joseph.

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Joseph, E.J., Charles, R.F. & Donald, S.S. Creep properties of micron-size domains in ethylene glycol modified wood across 4½ decades in strain rate. MRS Online Proceedings Library 1132, 11320721 (2008). https://doi.org/10.1557/PROC-1132-Z07-21

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  • DOI: https://doi.org/10.1557/PROC-1132-Z07-21

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