Modelling of cracking of the ceramic foam specimen with a central notch\nunder the tensile load

0504490 - ÚFM 2020 RIV NL eng J - Journal Article
Ševeček, O. - Bertolla, Luca - Chlup, Zdeněk - Řehořek, L. - Majer, Z. - Marcián, P. - Kotoul, M.
Modelling of cracking of the ceramic foam specimen with a central notch
under the tensile load.
Theoretical and Applied Fracture Mechanics. Roč. 100, APR (2019), s. 242-250. ISSN 0167-8442. E-ISSN 1872-7638
Institutional support: RVO:68081723
Keywords : Ceramic foam * Notch * Fracture * FE model * Kelvin cell * Tensile test
OECD category: Ceramics
Impact factor: 3.021, year: 2019
Method of publishing: Limited access
https://www.sciencedirect.com/science/article/pii/S0167844218306232?via%3Dihub

In this contribution, open cell ceramic foam structures composed of regular/irregular shape cells and containing a macroscopic central notch/crack were investigated in terms of their cracking upon the tensile loading and their strength was predicted using the FE simulations. The developed model of the real ceramic foam specimen containing a central notch/crack was subjected to a tension, resulting in a failure beginning at the tip of the notch. The work discusses an approach how to predict the critical failure load and also the crack path in the foam structure. Various cell irregularity and size of the macroscopic notch was considered in the investigations. Predictions of the foam structure cracking were performed using the beam element based FE model having characteristics of the real foam structure and by utilization of the stress criterion which considers failure of particular struts, when the maximum stress on them reaches the tensile strength of the ceramic material. Outputs from simulations were compared with available experimental observations and with an estimation of the critical failure load calculated using the developed analytical model.
Permanent Link: http://hdl.handle.net/11104/0296493