Influence of hygromechanical history on the longitudinal mechanosorptive creep of wood

Cédric Montero, Joseph Gril, Clémentine Legeas, David G. Hunt, Bruno Clair
2012 Holzforschung  
An experiment was performed on Norway spruce to simplify our understanding of mechanosorptive creep. Two well-matched sets of specimens were subjected to the same humidity history but loaded in four-point bending at different times. One set was loaded dry, and thus experienced a considerable creep at first adsorption (the so-called ++ effect). The other set was then loaded wet and only exhibited, together with the dry-loaded set, the usual pattern of creep increase during drying (-effect)
more » ... ing (-effect) followed by a partial recovery during remoistening (+ effect). Both sets converged to the same response after a few cycles. The results confirm that a single type of mechanosorption, combined with strain-dependent hygroexpansion and humidity-dependent viscoelascity, is sufficient to account for all observed features of longitudinal creep of wood at ambient temperature.
doi:10.1515/hf-2011-0174 fatcat:7yf5oclsm5f5ze3mxpeaw3eymy