This paper presents two kinds of line models to simulate and to analyse crack development in mode I in wooden beams. The cohesive crack model is presented as a useful tool to reproduce crack initiation and crack propagation in fracture specimens. This non-linear model is able to describe the fracture process zone development located at the crack tip and to explain the R-Curve behaviour obtained by LEFM. In the second time, the elastic layer model is investigated; it is based on a set of elastic calculations reproducing crack growth in specimens by the means of an idealized brittle material. This approach can give good estimations of load bearing capacities of structural timber elements.
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