Buckling Knockdown Factors for Hemispherical Foam Core Sandwich Shells With Single Dimple
In this study, nonlinear postbuckling analyses are performed using ABAQUS to derive the buckling knockdown factors (KDFs) for hemispherical foam core sandwich shells under external pressure. Two hemispherical foam core sandwich shells (dimple and flat models) with different inner sheet thicknesses a...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2024-01-01
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| Series: | International Journal of Aerospace Engineering |
| Online Access: | http://dx.doi.org/10.1155/2024/8765733 |
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| author | Chang-Hoon Sim Chang-Min Lee Gi-Seop Kim Jae-Sang Park Jun-Seong Lee |
| author_facet | Chang-Hoon Sim Chang-Min Lee Gi-Seop Kim Jae-Sang Park Jun-Seong Lee |
| author_sort | Chang-Hoon Sim |
| collection | DOAJ |
| description | In this study, nonlinear postbuckling analyses are performed using ABAQUS to derive the buckling knockdown factors (KDFs) for hemispherical foam core sandwich shells under external pressure. Two hemispherical foam core sandwich shells (dimple and flat models) with different inner sheet thicknesses are considered. The crushable foam modeling technique is used to represent the nonlinear compressive behavior of the foam material. The geometric initial imperfection modeling technique, the single dimple imperfection approach, is established to represent the geometric initial imperfection of the hemispherical foam core sandwich shells. The postbuckling analyses using the Riks method are carried out to predict the buckling behaviors of shells with geometric initial imperfections. The KDFs of the dimple and flat models are derived to be 0.20 and 0.22, respectively, which are up to 11.11% and 22.22% higher, respectively, than the previous NASA buckling design criteria. Therefore, the present KDFs provide a lightweight design for hemispherical foam core sandwich shells. |
| format | Article |
| id | doaj-art-1a96d4b452ef4db6bfc499088a70f3d4 |
| institution | Kabale University |
| issn | 1687-5974 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Aerospace Engineering |
| spelling | doaj-art-1a96d4b452ef4db6bfc499088a70f3d42025-02-03T01:32:42ZengWileyInternational Journal of Aerospace Engineering1687-59742024-01-01202410.1155/2024/8765733Buckling Knockdown Factors for Hemispherical Foam Core Sandwich Shells With Single DimpleChang-Hoon Sim0Chang-Min Lee1Gi-Seop Kim2Jae-Sang Park3Jun-Seong Lee4Department of Aerospace EngineeringCore Technologies R&D TeamDepartment of Aerospace EngineeringDepartment of Aerospace EngineeringSmall Launch Vehicle Research DivisionIn this study, nonlinear postbuckling analyses are performed using ABAQUS to derive the buckling knockdown factors (KDFs) for hemispherical foam core sandwich shells under external pressure. Two hemispherical foam core sandwich shells (dimple and flat models) with different inner sheet thicknesses are considered. The crushable foam modeling technique is used to represent the nonlinear compressive behavior of the foam material. The geometric initial imperfection modeling technique, the single dimple imperfection approach, is established to represent the geometric initial imperfection of the hemispherical foam core sandwich shells. The postbuckling analyses using the Riks method are carried out to predict the buckling behaviors of shells with geometric initial imperfections. The KDFs of the dimple and flat models are derived to be 0.20 and 0.22, respectively, which are up to 11.11% and 22.22% higher, respectively, than the previous NASA buckling design criteria. Therefore, the present KDFs provide a lightweight design for hemispherical foam core sandwich shells.http://dx.doi.org/10.1155/2024/8765733 |
| spellingShingle | Chang-Hoon Sim Chang-Min Lee Gi-Seop Kim Jae-Sang Park Jun-Seong Lee Buckling Knockdown Factors for Hemispherical Foam Core Sandwich Shells With Single Dimple International Journal of Aerospace Engineering |
| title | Buckling Knockdown Factors for Hemispherical Foam Core Sandwich Shells With Single Dimple |
| title_full | Buckling Knockdown Factors for Hemispherical Foam Core Sandwich Shells With Single Dimple |
| title_fullStr | Buckling Knockdown Factors for Hemispherical Foam Core Sandwich Shells With Single Dimple |
| title_full_unstemmed | Buckling Knockdown Factors for Hemispherical Foam Core Sandwich Shells With Single Dimple |
| title_short | Buckling Knockdown Factors for Hemispherical Foam Core Sandwich Shells With Single Dimple |
| title_sort | buckling knockdown factors for hemispherical foam core sandwich shells with single dimple |
| url | http://dx.doi.org/10.1155/2024/8765733 |
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