Modified methods for estimation of local bifurcational loads including an effect of moderate geometrical inaccuracies
Artykuł w czasopiśmie
MNiSW
140
Lista 2021
| Status: | |
| Autorzy: | Kołakowski Zbigniew, Teter Andrzej |
| Dyscypliny: | |
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| Rok wydania: | 2022 |
| Wersja dokumentu: | Drukowana | Elektroniczna |
| Język: | angielski |
| Numer czasopisma: | 1 |
| Wolumen/Tom: | 279 |
| Numer artykułu: | 114869 |
| Strony: | 1 - 12 |
| Impact Factor: | 6,3 |
| Web of Science® Times Cited: | 1 |
| Scopus® Cytowania: | 1 |
| Bazy: | Web of Science | Scopus |
| Efekt badań statutowych | NIE |
| Materiał konferencyjny: | NIE |
| Publikacja OA: | NIE |
| Abstrakty: | angielski |
| The problem of estimation of values of local bifurcational loads in plate structures burdened with moderate geometrical inaccuracies is dealt with. A way to include an effect of geometrical inaccuracies on the estimated value of bifurcational loads is suggested. If these inaccuracies are not considered, it can have a serious impact on underestimation of bifurcational loads of the real thin-walled structure and can yield a consequential scattering of the results obtained for a various series of samples. A theoretical value of local bifurcational loads is deter-mined from a solution to the eigenproblem on the assumption that the structure is perfect and not burdened with geometrical inaccuracies. Under laboratory conditions, samples are always burdened with inaccuracies, and, what follows, imperfections always occur. A detailed procedure in which the classical plate theory (CPT) and the laminated plate theory (CLPT) within Byskov-Hutchinson’s approach to Koiter’s theory for a plate model of the thin-walled structure were assumed was developed. To verify the results, numerous finite element method (FEM) simulations were conducted. On one hand, solutions to the eigenproblem were compared to post-buckling be-haviors of actual structures with imposed initial deflections, which were used to estimate values of bifurcational loads with the following modified methods: the P-w2 method, the intersection method and the Δ-w2 method. A very good agreement between the results attained with new methods and theoretical solutions was obtained. |
