This UMAT was developed with a novel progressive failure model for the 3D simulations of pultruded FRP structures which allows the modelling of the laminates as a homogeneous material, using solid elements. The failure initiation model proposed requires only the strength in each direction as input, combining them to retrieve in-plane and out-of-plane failure indexes. The damage propagation model can be divided in two main stages: (i) damage progression and (ii) constant stress beyond a limit strain. The former stage uses the in-plane and out-of-plane failure indexes to determine the damage progression, using different parameters in each direction to account for the different damage responses, while the latter is characterized by a constant stress after a limit strain is reached, also different for each direction.
You can find the UMAT in the following link:
Example materials can be downloaded from the following links:
Material library: https://coregroup.tecnico.ulisboa.pt/uploads/UMAT/DamageProg.lib
If you use this UMAT in your work, please cite us:
- J.A. Gonilha, N. Silvestre, J.R. Correia, V. Tita, D. Martins, “Novel progressive failure model for quasi-orthotropic pultruded FRP structures: formulation and calibration of parameters (Part I), Composite Structures, 2020, 112974. DOI: https://doi.org/10.1016/j.compstruct.2020.112974
- J.A. Gonilha, N. Silvestre, J.R. Correia, V. Tita, D. Martins, “Novel progressive failure model for quasi-orthotropic pultruded FRP structures: application to compact tension and web-crippling case studies (Part II), Composite Structures, 2020, 112973. DOI: https://doi.org/10.1016/j.compstruct.2020.112973