- Tytuł:
- Modelling and identification of voids nucleation and growth effects in porous media plastic flow
- Autorzy:
-
Nowak, Z.
Stachurski, A. - Powiązania:
- https://bibliotekanauki.pl/articles/970581.pdf
- Data publikacji:
- 2003
- Wydawca:
- Polska Akademia Nauk. Instytut Badań Systemowych PAN
- Tematy:
-
optymalizacja globalna
regresja nieliniowa
programowanie nieliniowe
plastic flow of voided media
material functions identification
global optimization
nonlinear regression
nonlinear programming
Akaike and FPE tests for nested models
Vuong test for nonnested models - Opis:
- In the paper the effects of nucleation and growth of voids in the plastic porous media are investigated. Three different forms of the model are considered: the augmented Gurson model (total porosity model) with variable nucleation and growth material function, the same model with constant growth material function and the separated porosity model. The identification of the material functions parameters is based on Fischer's experimental data set for axisymmetric tension of steel specimens and formulated as a typical nonlinear regression problem using the least squares approach. The resulting minimization problem is solved by means of our own implementation of the Boender at al. global minimization method. Calculations and statistical analysis (Akaike, FPE and Vuong tests) have led to a conclusion that the growth material function in the uniaxial tension for steel may be assumed to be constant although not necessarily equal to one.
- Źródło:
-
Control and Cybernetics; 2003, 32, 4; 819-849
0324-8569 - Pojawia się w:
- Control and Cybernetics
- Dostawca treści:
- Biblioteka Nauki
Artykuł