| Popis: |
A procedure is presented to generate 3D FE models of timber boards based on CT scans. Theboards were tested in four-point bending tests until failure and the local displacement in the pure bendingzone was recorded. The CT scans were treated as 3D images and image processing methods were usedto reconstruct the board, the knots and the pith. A new procedure to reconstruct the fibre deviationsaround knots by accounting for image gradient information was used. A quadratic tetrahedral mesh wasgenerated for the region of the board which was under pure bending in the tests. The fibre directions andthe stiffness tensor, scaled by the local density, were transferred into each integration point of the meshand the bending test was replicated. Preliminary results show that the procedure is able to realisticallypredict the observed local stiffness of the boards. Further development of the procedure is required toaccount for dead knots and to extend the procedure for indicating strength and predicting failure. ReadiStrength |
