Numerical modelling of ductile damage evolution in tensile and bending tests of timber structures

Finite element analysis of flexural strengthening of timber beams with Carbon Fibre-Reinforced Polymers

“…Nonetheless, it was assumed that the behaviour in the radial direction (2) is similar to that observed in the transverse direction (3), which translates into [15,20,[27][28][29][30][31]:…”

“…In our previous works [20,27,28], the damaged finite elasto-plastic behaviour was described in the framework of the thermodynamics of irreversible processes with state variables. We limited ourselves to the fully coupled isothermal formulation using a single yield surface for both plasticity and ductile isotropic damage (the mechanical dissipation was described using the theory which considers only one potential of dissipation).…”

Numerical analysis of flexural strengthening of timber beams reinforced with CFRP strips

“…The failure in compression along the grain direction is different from that perpendicular to the grain. At angles to the grain ranging from 10°to 45°, the failure modes are brittle due to the activated transverse tension and shear (as reported in [14,15] and references given there). However, as the angle increases, the failure modes shift from brittle to ductile with large plastic deformations.…”

“…Hence based on the geometry of a log, a Cartesian coordinate system LRT is defined as shown on Fig. 5, and is formulated within the framework of thermodynamics of irreversible processes with internal variables [10,11,14,15,[17][18][19][20][21][22][23][24].…”

“…Yet, it was one of the most neglected fields of research [12,13]. It is the aim therefore of the present study to analyse the damage evolution in wood within the framework of Continuum Damage Mechanics (CDM) and plasticity [14,15]. It takes into account the orthotropic elastic behaviour; the plastic anisotropic; the isotropic ductile damage; the large plastic deformations occurring during loading; CFRP laminate strip and epoxy adhesive.…”