With the advancement s being made in manufactu ring technology, it is now possible to manufacture panels with arbitrary curvilinear stiffeners. A plate stiffener can some cases yield a desired structural response but lower mass . In this paper , Element Free Galerkin (EFG) method employed for buckling and static analysis of stiffened plates. The formulation allows placeme nt any number arbitrarily stiffeners within plate. First Order Shear Deformation Theory (FSDT) used model behav ior...

The element-free Galerkin method, which is based on the moving-least-squares approximation, developed for vibration analysis of unitized structures (e.g., a plate with curvilinear stiffeners). and stiffeners are modeled using first-order shear deformation theory Timoshenko beam theory, respectively. approximation does not satisfy delta function property. Consequently, an method well-known penalty method) must be used imposing essential boundary conditions. A key benefit stiffened panel that...

loading,increasingfromzerotothebucklingload,onthenaturalfrequenciesisstudied.Severalnumericalexamples are compared with the other results available in literature and mesh free results, illustrating accuracy of present approach. This paper also shows that in-plane load can lead to a significant change natural frequency some cases corresponding mode shapes plates curvilinear stiffeners. Numerical presented for range plate aspect ratios, bending stiffness ratios stiffener...

This paper proposes the use of curvilinear stiffeners as a mechanism to control supersonic panel flutter. To account for transverse shear deformation, plate and are modeled according first-order deformation theory Timoshenko beam theory, respectively. The Chebyshev polynomials basis deflection rotation functions in Ritz method. aeroelastic load is formulated high-Mach-number approximation linear potential flow theory. minimum energy Hamilton's principle used solve problem. Plots frequency...

This paper presents an experimentally validated framework used to perform topology and orientation (morphology) optimization of lattice structures subject stress constraints. The effective stiffnesses yield stresses a unit cell are obtained using numerical homogenization experimentally. Due the orthotropic behavior cell, modified Hill's criterion is describe strength. properties implemented via macrostructure further improve structure stiffness. Homogenization-based performed coarse mesh...

The optimization of supersonic aircraft structures needs to address different aspects the design as internal structural layout, sizing components, aerodynamic loads developed for given flight conditions and aeroelastic response structure. In particular, study interaction between structure aerodynamics is critical designing large transport must be considered in an framework which aims obtain more efficient wing structures. this paper, SpaRibs concept implemented a multidisciplinary including...

In this research, the vibration analysis of plates with curvilinear stiffeners is carried out. The Ritz method applied while are considered as discrete elements. first-order shear deformation theory used to represent plate and stiffener. Chebyshev polynomial functions basic in method. major part work concerned modeling comparing results experimental data. By considering stiffeners, curvature, continuous variation orientation, can be controlling different mode shapes addition associated...

Abstract The element free Galerkin (EFG) method is developed for the vibration of a functionally-graded plate with curvilinear stiffeners. governing equations and stiffeners are derived by using first order shear deformation theory. in-plane deformation, transverse deflection rotations stiffener expressed moving least square (MLS) approximation. penalty used to impose boundary conditions. Material properties assumed vary continuously through thickness, according power law, in terms volume...

The focus of this research is to create a methodology systematically generate spatially-varying, periodic, cellular microstructures that are tailored attain optimized performance the macrostructure. unit cell lattice represented by Fourier series expansions, and corresponding amplitudes phase spectrum obtained. Then, material distribution (topology) orientation each (morphology) for multiple load cases. spatial harmonics updated based on orientation, analog response thresholded with find...

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View Video Presentation: https://doi.org/10.2514/6.2023-2077.vid Automated fiber placement (AFP) is an additive manufacturing (AM) method for placing continuous carbon fiber-reinforced polymer (CFRP) tapes side-by-side and ply-by-ply to form a part. AFP commonly used in the aerospace industry its repeatability speed. Low-melt polyaryletherketone (LM-PAEK) recently developed thermoplastic offering relatively low viscosity processing temperatures, enabling situ consolidation using...