Effect of Component Volume Fractions on Elastic Parameters of Poplar Wood Based on Improved Hofstetter Model
The microstructure characteristics and composition of wood are important factors that affect elastic parameters.However,little research has been conducted on the impact of volume fraction changes in wood components.The Hofstetter continuum micromechanics model for wood was improved by introducing ash.The effect of changes in the component volume fraction of poplar wood on elastic parameters was discussed.The result shows that the improved Hofstetter model can accurately predict the longitudinal elastic modulus EL,with an absolute value of error of 13.71%.The elastic modulus and shear modulus of poplar increase significantly when the component volume fraction with high stiffness such as crystalline cellulose increases.When the volume fraction of polymer network or amorphous cellulose increases,the increase of Poisson's ratio is significant.Changes in the volume fraction of lignin or hemicellulose have a small impact on all elastic parameters.
poplar woodimproved Hofstetter modelcontinuous medium hypothesiscomponentselastic parameterchanges in component volume fractions
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