Design, Optimization, and Evaluation of Al–2139 Compression Panel with Integral T-Stiffeners

Mulani, Sameer B.; Havens, David; Norris, Ashley; Bird, R. Keith; Kapania, Rakesh K.; Olliffe, Robert

doi:10.2514/1.c032199

Cited by 7 publications

(7 citation statements)

References 9 publications

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“…Following this the method has been studied extensively in flat plates [29], laminated panels [30], thin walled structures [31], curved plates [32], plates with combined load cases [33], composite shell structures [34], thin composite laminate stiffened panels [35][36][37], and composite panels with diaphragm ends [38]. The study and application of such methods beyond theoretical study has primarily been on thin laminate composite panels used for the aerospace industry which was sponsored and developed through NASA's Langley Research Center [39][40][41][42][43][44][45]. The finite strip method has proved to be an accurate and computationally cost-efficient means to model plates and thin stiffened composite laminate panels.…”

Section: Finite Strip Methodsmentioning

confidence: 99%

Design curves for stiffened engineered timber wall systems: A verified analytical approach

Orlowski

Kennedy

2020

Structures

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This manuscript introduces the mathematical modelling of efficient stiffened engineered timber wall systems and presents a collection of corresponding design curves. An analytical approach via the exact finite strip method through the Wittrick-Williams algorithm was used in this study to understand and predict the behaviour of such systems. Appropriate orthotropic material models and strength limits have been incorporated into the analytical method for the engineered timber panel and sawn cut timber stud stiffeners respectively. This is the first time that this approach has been used in this field of timber engineering and hence was verified through experimental testing and detailed Finite Element Analysis (FEA). Compared to FEA there is over a thousand-fold decrease in computational cost which allowed many parameters to be varied incrementally including: the thickness of the panel, number of stiffeners, height of the wall and applied load. The results of which has enabled a set of versatile and simple validated design curves to be developed and presented. With these design curves, for a desired load capacity, the optimal system configurations are given. Likewise, for a chosen configuration the allowable axial load is given.

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Section: Finite Strip Methodsmentioning

confidence: 99%

Design curves for stiffened engineered timber wall systems: A verified analytical approach

Orlowski

Kennedy

2020

Structures

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“…6-a was manufactured and tested at NASA Langley and the test results matched very well with the nonlinear analysis. [38][39][40] The predicted strains using nonlinear FEM analysis and experimental strains are shown in Fig. 6-c and one can see that the buckling has occurred at the predicted load factor by EBF3PanelOpt.…”

Section: Mass (Kg) Plate Thickness (Mm) Von Mises Ks Stress*10mentioning

confidence: 96%

EBF3PanelOpt: A Computational Design Environment for Panels Fabricated by Additive Manufacturing

Kapania

Mulani

Tamijani

et al. 2013

51st AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

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We have developed an optimization framework, EBF3PanelOpt to design stiffened panels with curvilinear stiffeners. The curvilinear stiffening tries to utilize the larger design space created by such additive manufacturing techniques like Electron Beam Free Form Fabrication, Friction Stir Welding, and Selective Laser Sintering. Structural loads of future aerospace vehicles may not be well characterized using our knowledge-based databases, so medium-fidelity modeling capabilities of software, Msc.Patran (geometry and meshing), and Msc.Nastran (finite element analysis) are integrated in EBF3PanelOpt. The EBF3PanelOpt minimizes the mass of the stiffened panel with the constraints on buckling, von Mises stress and crippling of the stiffeners. The panel/stiffener geometry is parameterized using design variables that include variables for orientation and shape of the stiffeners, the thicknesses and height of the stiffeners, and the plate thickness. The plate can have uniform thickness or non-uniform thicknesses for the pockets created by the stiffeners. The EBF3PanelOpt is enhanced to have curvilinear T stiffeners with or without axial loads in addition to loads through plate Both the vibro-acoustic and structural optimization are supported using multi-objective optimization in EBF3PanelOpt. To enhance the computational efficiency, an improved surrogate model built using artificial neural network and kriging is utilized. To quantify the uncertainty in the design variables or parameters, reliability analysis is supported in EBF3PanelOpt.

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“…12 and Mulani et al. 13 made optimizations with curvilinear stiffeners and T-stiffeners using the software of EBF3PanelOpt. Panel's weight was minimized while subjected to constraints on buckling load, yielding, and crippling or local stiffener failure.…”

Section: Introductionmentioning

confidence: 99%

Optimization of lightweight sub-stiffened panels with buckling analysis and imperfection sensitivity analysis

Chen

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part G:

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On the purpose of improving the structural efficiency of stiffened panels, which is widely used in engineering, three promising layouts of sub-stiffened thin-walled structures were optimized in view of structure's initial buckling and further analyzed through post-buckling and imperfection-sensitivity analysis. The optimization tasks were carried out using an integrated framework, which is based on the multidisciplinary optimization platform Model Center and finite element method software ABAQUS. The particle swarm optimization algorithm was applied to optimize layout parameters. Three optimal sub-stiffened panels were then evaluated based on their performance on critical buckling loads and post-buckling ultimate strength under uniaxial loading. Imperfection-sensitivity analysis was also conducted to investigate the stability behavior of the proposed panels with defect. The results indicate that the introduction of sub-stiffeners into the traditional stiffened panel can achieve significant improvements on the panel's buckling loads and ultimate strength under uniaxial loading, which are favorable to expand design space for engineering structures under requirements of lightweight with high bending stiffness and bucking resistance.

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Design, Optimization, and Evaluation of Al–2139 Compression Panel with Integral T-Stiffeners

Cited by 7 publications

References 9 publications

Design curves for stiffened engineered timber wall systems: A verified analytical approach

Design curves for stiffened engineered timber wall systems: A verified analytical approach

EBF3PanelOpt: A Computational Design Environment for Panels Fabricated by Additive Manufacturing

Optimization of lightweight sub-stiffened panels with buckling analysis and imperfection sensitivity analysis

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