Paper presents a constitutive model for concrete that combines a continuous and discontinuous crack’s description to simulate the concrete under tensile dominated loads. In a continuum regime, two different constitutive laws were used. First, a plasticity model with the Rankine failure criterion and an associated flow rule was used. Second, a constitutive law based on isotropic damage mechanics was formulated. Both model alternatives were enriched by a characteristic length of micro-structure with the aid of a integral non-local theory to preserve the mesh-insensitivity of FE-results. Displacement jumps across cracks were captured by applying the eXtended Finite Element Method (XFEM) with cohesive tractions. A transfer function was introduced allowing for a gradual switch from a continuous (smeared) to discontinuous (discrete) softening process. Nodes and elements in the transition zone were doubled. Two benchmarks were numerically simulated with a dominated mode-I (three-point bending test) and under mixed-mode conditions (Nooru-Mohamed test).
Authors
Additional information
- Category
- Aktywność konferencyjna
- Type
- materiały konferencyjne indeksowane w Web of Science
- Language
- angielski
- Publication year
- 2018
