Kumar, AP and Méndez, JP and Burela, RG and Bisagni, C and Harursampath, D and Ponnusami, SA (2024) Non-linear buckling analysis of delaminated hat-stringer panels using variational asymptotic method. In: Composite Structures, 345 .
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Abstract
This research proposes a computationally efficient methodology using a Constrained Variational Asymptotic Method (C-VAM) for non-linear buckling analysis on a hat-stringer panel with delamination defects. Starting with the geometrically non-linear kinematics, the VAM procedure reduces the three-dimensional (3-D) strain energy functional to an analogous 2-D plate model and evaluates the closed form warping solutions. Utilising the resulting warping solutions and recovery relations for the skin and the stringer, displacement continuity at the three-dimensional level is enforced between the stringer and the skin based on the pristine and delaminated interface regions. Consequently, the constrained matrices obtained from C-VAM is incorporated into an in-house developed non-linear finite element framework. Using the developed formulation, a stiffened panel with delamination of 40 mm between the stringer and the skin is analysed under compression. The results have been validated locally and globally, employing experimental data and 3-D finite element analysis (FEA). Experiments are carried out on the co-cured panel by applying quasi-static loading with displacement-controlled conditions, and 3-D FEA is carried out in Abaqus. Load-response plots have been obtained to validate the results at the global level, and they are in excellent agreement with experiments and 3-D FEA. Subsequently, out-of-plane displacement contour plots are obtained; the number of half waves and wave intensity in 3-D FEA and C-VAM are comparable, although there are minor differences compared to the experimental findings. The proposed framework is shown to be computationally efficient by over 55 as compared to 3-D FEA for performing non-linear buckling analysis on the stiffened composite structure considered in the current work. © 2024 The Author(s)
| Item Type: | Journal Article |
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| Publication: | Composite Structures |
| Publisher: | Elsevier Ltd |
| Additional Information: | The copyright for this article belongs to authors. |
| Keywords: | ABAQUS; Buckling; Computational efficiency; Displacement control; Strain energy; Stringers; Structure (composition), 3-D finite element analyse; 3-D finite elements; Finite element analyse; Hat-stringer panel; Linear buckling; Linear buckling analysis; Non linear; Non-linear buckling; Stiffened composite structure; Variational asymptotic methods, Finite element method |
| Department/Centre: | Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering) |
| Date Deposited: | 16 Dec 2024 11:27 |
| Last Modified: | 16 Dec 2024 11:27 |
| URI: | http://eprints.iisc.ac.in/id/eprint/85797 |
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