Stress-wave speed and attenuation as predictors of the tensile and flexural properties of wood-based particle composites
This research was conducted to further the development of the longitudinal stress-wave method of nondestructively evaluating the mechanical properties of wood-based particle composite materials. A mathematical model was developed that quantifies the motion of any cross-section of a homogeneous viscoelastic bar in response to a propagating stress wave in terms of the bar's viscoelastic parameters. It was found to be in agreement with a qualitative evaluation of the motion of such a bar. The model revealed wave speed to be a function of the modulus of elasticity of the bar and that the motion of any cross-section is periodic and attenuates at a rate which is a function of the energy-dissipation properties of the bar. An experimental investigation of stress-wave behavior in clear wood and wood-based particle composites revealed that the model developed accounts for the major components of stress-wave behavior in such materials. Also, it was found that defect-related interfaces in these materials result in predictable deviations in wave behavior from that described by the model.
- Research Organization:
- Washington State Univ., Pullman, WA (USA)
- OSTI ID:
- 7004423
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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