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For. 485: Lignocellulosic Composite Materials

For. 485: Lignocellulosic Composite Materials. Lecture 1-4: Viscoelastic Behavior of Wood. Viscoelasticity. A viscoelastic material is one in which: hysteresis is seen in the stress-strain curve . stress relaxation occurs: step constant strain causes decreasing stress

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For. 485: Lignocellulosic Composite Materials

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  1. For. 485: Lignocellulosic Composite Materials Lecture 1-4: Viscoelastic Behavior of Wood

  2. Viscoelasticity • A viscoelastic material is one in which: • hysteresis is seen in the stress-strain curve. • stress relaxation occurs: step constant strain causes decreasing stress • creep occurs: step constant stress causes increasing strain • From Wikipedia, the free encyclopedia

  3. Viscoelasticity of Lignocellulosics • Attributable to the multicomponent polymer system comprising the cellular solid • Is manifested in thermo-compression processes FPL-GTR-149

  4. OSB “mattress” or mat undergoing increasing compressive strain

  5. Stress-strain diagram for a wood particle mat under compression

  6. For more information… • …See the handout to accompany this discussion…an excerpt from Forest Products Lab General Technical Report, FPL-GTR-149 (source of the diagrams in this lecture) • Complete publication is available at:http://www.fpl.fs.fed.us/documnts/fplgtr/fpl_gtr149.pdf

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