CONSTITUTIVE MODEL FOR WOOD BASED ON CONTINUUM DAMAGE MECHANICS

摘要

Based on the theory of continuum damage mechanics (CDM), a 3D constitutive model was developed that allows for a holistic approach for timber models. With one single material model, simultaneous ductile and brittle behaviour of wood can be simulated and the failure modes can be identified. To validate the model, tension, compression and embedment tests were modelled applying the developed constitutive model. Not only softwoods were used, but also European and tropical hardwoods. The predictive quality of the constitutive model was assessed by comparing load-slip curves and failure modes of the test specimens with the numerical results. Good agreements were found and brittle behaviour with stable crack growth could be predicted. The developed material model proved to be a valid approach to improve the prediction quality of numerical models and to identify failure modes.