The Study Of Process & MOE Model Of OSB-veneer Composite Container Flooring

Oriented strand board (OSB)-veneer composite container flooring (OSBVCCF) is a multi-layer composite board manufactured with OSB as the core and the veneer as the face. It is used as container flooring to bear the freight loads. Therefore it must have high stiffness and strength, aging-resistant and fatigue resistant to ensure the safety of freight and have essential service-life.This paper researches mainly on the OSBVCCF. Use modern machines such as DENSE LAB X, PRESSMAN, LASER TEST ANGLE and STEAM INJECTION HOT-PRESS and so on. At the same time the theories of elastic and elastic-plastic mechanics, anisotropic laminate, damage mechanics and model simulation were used to analysis the mechanical properties of OSBVCCF. The study is mainly on the constitutive relationship between macro mechanical properties and micro structure (thin layer). First establish the model of density and MOR & MOE of the veneers, which were treated with heat, pressure and resin, then get the model prediction system of MOR and MOE of the OSBVCCF. The high shear of OSB can be proved by theory.1. Researches on hot-press can get: 1) The mechanic properties of one hot-press OSBVCCF can meet the request of container flooring. 2) The time of steam injection hot-press is only half (7 minutes) time of the ordinary hot-press, and the shear strength increases 35%. 3)Analysis the mechanical properties of the OSB manufactured by the mill with the resin 7.5% and 10%, The significant difference only exists on the shear strength(3.41MPa and 3.1MPa separately). 4) The optimization time of veneer over-layered are 24~27minutes.2. Analyze the composite characteristics of OSB and the veneer of OSBVCCF. Formulate a series of models indicating the relationship between macro properties and micro structure parameter and other physical parameter. The OSBVCCF can be treated as an orthotropic laminate with symmetrical structure configures by the macro even OSB and veneers.3. Derive the stiffness matrix of OSBVCCF in reference to the stiffness theory of composite laminate, and the coupling effect have been neglected according to this assumption, derive the theoretical prediction models of MOE of OSBVCCF.4. In reference to the stiffness theory of laminate, divide the OSB into 96 thin-layers, and use laser to test the distribute angle of strands, then according to the density tested by the DENSE LAB X, and derive the MOE of the thin-layers. According to these data, use Visual Basic for Applications to compute the MOE of the OSB.5. Formulate the MOE model of veneers which were treated with heat, pressure and resin on the basis of mixture mode of fiber reinforced composite and stiffness theory of laminate respectively. It shows: 1) The veneer treated with heat, pressure and resin can get 3 times MOE on perpendicular diction than the veneer without treated. 2) The MOE of veneer spread and impregnated with pressure will be increased with the density, and their increasing speed is lower than that of the compressed veneer.6) According to the theory of anisotropic laminate, study the stress distribution of the OSBVCCF with the linear elastic stress-strain and elastic-plastic stress-strain relation. Derive the evaluating formulation of central axis offset considering the compression yield of upper longitudinal layers. Presume theoretical bending rupture mode of OSBVCCF. On the basis of the damage mechanics principles of MOR of OSBVCCF according with different rupture model. Establish theoretical prediction relationship models of MOR of OSBVCCF with different span. In order to compute the MOR easily. Formulate a MOR model of OSBVCCF according to the MOR of same wood as the surface veneer of the OSBVCCF.