Study on the four-point bending beam method to improve the testing accuracy for the elastic constants of wood

Using the static analysis of ANSYS 19, longitudinal, radial, and tangential beam specimens spruce, Scots pine, beech were subjected to stress strain under symmetrical four-point bending asymmetrical bending. The effects wood grain on surface specimen its properties transverse longitudinal at center studied experimentally. results show that method is suitable for testing elastic modulus, Poisson’s ratio shear modulus wood. larch tangential, radial Sitka spruce tested by method. Their effectiveness was verified axial tension method, square plate torsional free rod vibration two-group tests with half bridge measurement has successfully improved test accuracy wood, been asymmetric adopts ± 45°strain gauge full which simple effective in improving modulus.