A Damage Tolerance Study of Curvilinearly Stiffened Panels with Different Crack Lengths Using a Global-local Finite Element Method

Islam, Mohammad Majharul; Kapania, Rakesh K.

doi:10.2514/6.2013-1475

Cited by 2 publications

(1 citation statement)

References 47 publications

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“…[15][16][17] Recently, Marc instead of Abaqus, is being used in EBF3PanelOpt for damage tolerance calculation. [18][19][20][21][22][23][24][25] Our well established development of curvilinear blade-stiffened panel framework is discussed. [26][27][28][29][30][31][32][33][34] Currently, EBF3PanelOpt framework allows the user to perform multi-objective design optimization of flat multi-sided panels with straight/curved edges having curvilinear, blade and 'T' stiffeners.…”

Section: Ebf3panelopt Frameworkmentioning

confidence: 99%

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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