Numerical approach using DEM to predict the failure mechanical response of porous brittle cylindrical tablets with a hole
This paper deals with the development of a Discrete Element Method (DEM) based approach to reproduce the diametral compression test applied to dense porous cylindrical tablets with a hole. Stress Concentration Factor (SCF), which is the ratio of highest stress to the reference one obtained without hole, is assessed as function of hole size using a new halo definition for stress prediction.
Highlights
- DEM is adopted to simulate diametral compression of tablets with a hole.
- A new halo definition is proposed to evaluate suitable stress fields.
- Stress fields are evaluated for flawless and drilled tablets.
- Stress Concentration Factors are assessed as function of hole size.
- Brittle failure of cylindrical tablets is discussed with respect to hole size.
Results exhibit that the SCF is continuously increasing depending on the hole size, which agrees with experimental observations but differ somewhat from Finite Element Method (FEM) and theoretical predictions for which SCF is constant for small holes. Finally, the failure mechanical response of brittle cylindrical tablets with a hole is discussed. Two distinct behaviours are noticeable according to hole size. Thus, samples characterised by a ratio lower than 0.1 exhibit a brittle behaviour, while those characterised by a ratio higher than 0.1 display a quasi-brittle one.
Read more here
W. Leclerc, H. Haddad, M. Guessasma, Numerical approach using DEM to predict the failure mechanical response of porous brittle cylindrical tablets with a hole, Powder Technology, 2024, 119822, ISSN 0032-5910, https://doi.org/10.1016/j.powtec.2024.119822.
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