ABSTRACT
In the case of wood, a theoretical model as suggested by Grossman and Wold [23] in which the wood sample is treated as an assembly of long hollow tubes. These
tubes correspond to slip planes in the wood fibers. After local damage to the hollow tubes, the tubes are considered to be separated from their neighbors and to behave like unstable columns. The results show that the predicted stress at failure according to this theory is several times greater than the experimentally observed values. This discrepancy between theory and experiment arises from the treatment of the cells as tubes. Since the walls of tracheids and other cells are in reality wrinkled to some extent, they behave more like thin shells than like unstable columns.
