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

作     者：E. Jakes Joseph R. Frihart Charles S. Stone Donald 

作者机构：Materials Science Program University of Wisconsin-Madison Madison USA U.S. Forest Service Forest Products Laboratory Madison USA Department of Materials Science and Engineering University of Wisconsin-Madison Madison USA 

出 版 物：《MRS Online Proceedings Library》 

年 卷 期：2009年第1132卷第1期

页      面：1-6页

摘      要：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).