Sensitivity of finite element models to cracking parameters of cementitious materials
Magno T. Mota1; Rodolfo G. Mendes de Andrade1; Eduardo M. R. Fairbairn1
1 COPPE-UFRJ
doi:10.20906/CPS/CILAMCE2017-0822
Resumo
The fracture energy of a cementitious material is a key parameter when modeling such structures. However, unlike regular concrete design, there are no strict directives on how this parameter may be used when developing numerical models. This issue currently occurs in materials that present multiple cracks under direct tensile load, e.g. steel fiber reinforced cementitious composites. Thus, this paper aims to evaluate the influence of different cracking parameters of cementitious materials, focusing to the fracture energy of the material. The analyses comprise two different models for the cracking process: Smeared Crack Model and Discrete Crack Model. After reaching linear elastic peak stress, the numerical simulations outputs showed a considerable sensitivity to the number of cracks and to the crack bandwidth, pointing out to the need of more accurate and refined methods when determining the experimental fracture energy value.
Palavras-chave: Fracture Energy; Fracture Work; Crack Bandwidth