Size effect assessment by Weibull's approach and the coupled criterion
| Autor: | Tanja Lube, Sylvain Meille, Ronan Henry, Aurélien Doitrand |
|---|---|
| Přispěvatelé: | Matériaux, ingénierie et science [Villeurbanne] (MATEIS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Four-point bending 020502 materials Mechanical Engineering 02 engineering and technology Bending Function (mathematics) Coupled criterion Stress (mechanics) Effect assessment [SPI]Engineering Sciences [physics] 020303 mechanical engineering & transports 0205 materials engineering 0203 mechanical engineering Mechanics of Materials size effect Range (statistics) General Materials Science Strength Composite material Porous medium Constant (mathematics) Weibull distribution porosity/flaw |
| Zdroj: | Engineering Fracture Mechanics Engineering Fracture Mechanics, Elsevier, 2021, 256, pp.107979. ⟨10.1016/j.engfracmech.2021.107979⟩ |
| ISSN: | 0013-7944 |
| DOI: | 10.1016/j.engfracmech.2021.107979⟩ |
| Popis: | International audience; We evaluate Weibull's approach and the coupled criterion (CC) ability to reproduce bending failure stress variations as a function of specimen size in two porous materials, namely gypsum or zinc oxyde. Whereas both approaches well reproduce the size effect in gypsum specimens, only the CC succeeds in correctly predicting the failure stress variation for ZnO specimens. We thus question the basis assumption of increasing critical flaw size with increasing specimen size associated to Weibull's approach. Employing the CC to predict prematurate specimen failure initiating from a critical pore, we determine a relation between the failure force decrease and the corresponding possible critical pore size range. For the three tested gypsum types, we estimate the critical pore size range to lie around 50-250 microns, not retrieving increasing critical pore size with increasing specimen size, as assumed in Weibull's approach, but rather a constant critical pore size range for all specimens. |
| Databáze: | OpenAIRE |
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