MODELING AN ELASTIC STRESS IN A COLLOID CAPILLARY-POROUS BODY IN ITS DEHYDRATION BY DEPRESSURIZATION

Consideration has been given to combined eff ects of the pressure gradient and shrinkage on the distribution of
mechanical stresses in a wood specimen subjected to dehydration by depressurization. The time variation in the
moisture distribution across the specimen cross section has been identifi ed. The observed redistribution of moisture
from the center to the specimen surface results in the pressure gradient values being relatively low. Due to a more
uniform water content, there is also a decrease in mechanical stresses associated with shrinkage. Calculations have
shown that the eff ects of shrinkage are the most substantial in the case of water content reduction below the wood
hygroscopicity limit (fi ber saturation point), and also, in the case of dehydration of large-size specimens. The obtained dependences can be used for identifying treatment regimes for various materials without deterioration in their
consumer properties.
   
Author:  N. M. Gorbachev ,  M. A. Brich ,  I. A. Koznacheev
Keywords:  dehydration, thermomechanical treatment, depressurization, colloid capillary-porous body, mechanical stress, shrinkage, modeling
Page:  716