Finite Element Fracture Prediction For Wood With Knots and Cross Grain

A finite element/fracture mechanics model has been developed to predict the tension behavior of structural wood members containing defects. The computer code Starwx presented here is used in a preliminary investigation of the effect of global cross grain on the strength of structural wood members with knots. The results indicate a more severe stress condition for the member with global cross grain as compared to the straight grain member.A method of strength prediction is presented that, unlike other methods, simulates the progressive fracture/failure process in wood, which leads to the ultimate load-carrying capacity of the member. Program Starwx is employed to predict the failure of a wood member containing a knot and global cross grain in a case for which actual test data are available. The member ultimate strength predicted was within 15% of the strength determined by the test