Nondestructive Testing of Dynamic ElasticModulus of Wood-BasedPanel by the Method of Stress Wave

摘要

Testing method by velocity of stress wave is-widely used in the nondestructive testing system of strength of wood-based panel. Considering higher and higher requirement of accuracy on the testing system,the research developed testing system of stress wave velocity based on SCM in this paper. SCM is used as processing corn. The research calculated dynamic elastic modulus of wood-based panel,which was based on real-time tested data,such as velocity of stress wave and density of wood-based panel. And bending strength of wood-based panel is determinate on correlation of dynamic elastic modulus and bending strength. Then the research realizes strength rating on the wood-based panel. The research discussed on the testing principle,gave out concrete circuit of hardware and design of programming,and also carried out experimental verification of testing system in this paper.