Journal ArticleDOI
Buckling resistance of grid-stiffened carbon-fiber thin-shell structures
TLDR
In this article, a hybrid genetic algorithm combining the genetic approach with a simulated annealing algorithm was developed, which considers the characteristics of multi-constraints and mixed discrete-continuous design variables.Abstract:
Critical local and global buckling loads of grid-stiffened carbon-fiber thin-shell structures, such as advanced grid-stiffened (AGS) conical shells relevant to aviation and aerospace applications, under uniform external transverse pressure were determined analytically using an equivalent stiffness model considering the influence of non-uniform grid distribution and the minimum potential energy principle. Experiments and finite-elements analysis have been carried out to assess the reliability of this analytical model. To maximize the buckling resistance for optimal design of the AGS conical shells, a hybrid genetic algorithm combining the genetic approach with a simulated annealing algorithm was developed, which considers the characteristics of multi-constraints and mixed discrete–continuous design variables. Comparisons between the benchmark results from the traditional genetic algorithm and simulated annealing algorithm confirmed the validity and efficiency of the hybrid genetic algorithms. Numerical examples show that the local-buckling constraint is a key factor for weight optimization of the AGS carbon-fiber conical.read more
Citations
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A review on the mechanical behaviour of curvilinear fibre composite laminated panels
TL;DR: A review on works that investigate the mechanical behaviour of variable stiffness composite laminated panels is carried out in this article, where the review mostly focuses on buckling, failure and vibrati...
Journal ArticleDOI
On compressive properties of composite sandwich structures with grid reinforced honeycomb core
TL;DR: In this paper, periodical grids were selected to reinforce soft honeycomb cores of sandwich structures and a finite element method was proposed to calculate the critical buckling load of the combined core sandwich structures.
Journal ArticleDOI
A comparative review between Genetic Algorithm use in composite optimisation and the state-of-the-art in evolutionary computation
Zhenzhou Wang,Adam Sobey +1 more
TL;DR: By better understanding how Genetic Algorithms are used in composite structures and comparing to evolutionary computational literature, recommendations are provided to help increase the use of Genetic Algorithmms in solving composite optimisation problems in the future.
Journal ArticleDOI
Flexural strength and energy absorption of carbon-fiber–aluminum-honeycomb composite sandwich reinforced by aluminum grid
TL;DR: In this article, an orthogrid structure was added into the sandwich structure to raise the stiffness of soft honeycomb and therefore reduce the interfacial mismatch between carbon fiber and low-stiffness aluminum honeycomb, and three point bending tests were conducted to compare carbon fiber sandwiches with different types of core.
Journal ArticleDOI
Experimental, numerical and analytical investigation of free vibrational behavior of GFRP-stiffened composite cylindrical shells
TL;DR: In this paper, the authors investigated the vibration characteristics of stiffened composite cylindrical shells using experimental, numerical and analytical techniques, and established a theoretical formulation based on Sanders' thin shell theory.
References
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Journal ArticleDOI
In-Plane Stiffness and Yield Strength of Periodic Metal Honeycombs
A.-J. Wang,David L. McDowell +1 more
TL;DR: In this article, in-plane mechanical properties of periodic honeycomb structures with seven different cell types are investigated, such that initial yield is associated with short column compression or bending, occurring prior to elastic buckling.
Journal ArticleDOI
Anisogrid composite lattice structures for spacecraft and aircraft applications
V.V. Vasiliev,A.F. Razin +1 more
TL;DR: In this article, anisogrid composite lattice structures whose loadbearing shell is formed by systems of geodesic unidirectional composite ribs made by automatic wet winding process are discussed.
Journal ArticleDOI
Buckling load analysis of grid stiffened composite cylinders
TL;DR: In this paper, the authors developed an analytical model for determination of the equivalent stiffness parameters of a grid stiffened composite cylindrical shell by taking out a unit cell and smearing the forces and moments due to the stiffeners onto the shell.
Journal ArticleDOI
Analysis and Optimum Design of Composite Grid Structures
Hong-Ji Chen,Stephen W. Tsai +1 more
TL;DR: In this article, an integrated equivalent stiffness model is developed to describe a grid structure with or without laminate skins, where in-plane bending and shear of ribs are included without introducing any extra degree of freedom so that Mindlin's plate theory can still be adopted.
Journal ArticleDOI
Optimization for buckling loads of grid stiffened composite panels
TL;DR: In this article, an improved smeared method is developed to model the buckling problem of an isogrid stiffened composite cylinder, where the stiffness contributions of the stiffeners are computed by analyzing the force and moment effect of the stiffnessener on a unit cell.