VISCOELASTIC PROPERTIES OF BAMBOO

Dynamic viscoelastic properties of bamboo were determined in torsion a nd bending. Damping, measured by tan delta, in dry bam boo was relativ ely small, about 0.01 in bending and 0.02 to 0.03 in torsion, with lit tle dependence on frequency in the audio range. in wet bamboo, damping was somewhat greater: 0.012-0.015 in bending and 0.03-0.04 in torsion . The anisotropy in damping implies a purely cellular model is insuffi cient; there is targe-scale molecular orientation or at least two dist inct solid phases.