Optimization of tow fiber paths for composite design

Nagendra, S.; Kodiyalam, Srinivas; Davis, Jonathan; Parthasarathy, V.

doi:10.2514/6.1995-1275

Cited by 84 publications

(50 citation statements)

References 8 publications

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“…The most important mechanism behind the increased buckling loads was a redistribution of the loads from the unsupported edge hole to the supported edges. Similar improvements in buckling load and tensile strength capability have been found by Nagendra et al 5 who used NURBS to define fiber angle variations.…”

Section: Introductionsupporting

confidence: 65%

Bending Test of a Variable-Stiffness Fiber Reinforced Composite Cylinder

Blom¹,

Rassaian²,

Stickler³

et al. 2010

51st AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference

7
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0

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Two carbon-fiber-reinforced composite cylinders were tested in bending. One cylinder, the baseline cylinder, consisted of 0• , 90• and ±45• plies, whereas the other cylinder, called the variable-stiffness cylinder, contained plies with fiber orientations that varied in the circumferential direction, which caused a variation in laminate stiffness. The cylinders were optimized for maximum buckling load carrying capability under bending. 1Simulations showed that the variable-stiffness cylinder was able to redistribute the applied loads around the circumference, resulting in lower strain values at both the tension and the compression side of the cylinder and an improvement of the buckling load by 18 percent compared to the baseline cylinder. The purpose of the bending test was to show that the improvements obtained in the analytical results could also be achieved experimentally. The baseline cylinder was tested first to serve as a benchmark for the variable-stiffness cylinder. The finite element model was adjusted based on the baseline cylinder tests to represent the experimental conditions correctly. The model took into account the flexible connection between the cylinder and the test fixture, the test mechanism and geometric imperfections present in the cylinder and showed good agreement with the experimental results. The variable-stiffness cylinder was tested twice: first oriented in the direction it was designed for and later rotated 180 degrees about the cylinder axis, such that the loading direction on the cylinder was reversed. The predicted global response and strain distributions for both configurations corresponded well with the experimental data. The flexible boundary conditions and the geometric imperfections affected the load and strain distributions of the baseline and the variable-stiffness cylinders, but the relative improvements of the variablestiffness cylinder in the preferred orientation with respect to the baseline cylinder were not affected. Follow-up tests of the cylinders including cutouts or induced damage are planned in the future.

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Section: Introductionsupporting
confidence: 65%

Bending Test of a Variable-Stiffness Fiber Reinforced Composite Cylinder
Blom¹,
Rassaian²,
Stickler³
et al. 2010
51st AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference
7
0
2
0
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“…Several approaches and numerical analyses have been performed to optimize VSP design [13][14][15][16][17]. Other studies -e.g.…”

mentioning
confidence: 99%

Variable-stiffness composite panels: Defect tolerance under in-plane tensile loading
Falcó
¹
,
Mayugo
²
,
Lopes
³

et al. 2014
Composites Part A: Applied Science and Manufacturing
43
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22
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Automated Fiber Placement is being extensively used in the production of major composite components for the aircraft industry. This technology enables the production of tow-steered panels, which have been proven to greatly improve the structural efficiency of composites by means of in-plane stiffness variation and load redistribution. However, traditional straightfiber architectures are still preferred. One of the reasons behind this is related to the uncertainties, as a result of process-induced defects, in the mechanical performance of the laminates. This experimental work investigates the effect of the fibre angle discontinuities between different tow courses in a ply on the un-notched and open-hole tensile strength of the laminate. The influence of several manufacturing parameters are studied in detail. The results reveal that 'ply staggering' and '0% gap coverage' are effective techniques in reducing the influence of defects in these laminates.

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“…Global fiber path representation using linear combination of non-uniform rational B-splines (NURBS) passing through a fixed number of control points was implemented by Nagendra et al 11 . They studied optimal frequency and buckling design of laminated composites subjected to deformations, ply failure, and interlaminar stresses constraints.…”

Section: Literature Reviewmentioning
confidence: 99%

Design of Composite Layers With Curvilinear Fiber Paths Using Cellular Automata
Setoodeh¹,
Gürdal²
2003
44th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference
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The anisotropic advantageous properties of fiber reinforced composites may not be fully exploited unless the fibers are properly placed in their optimal spatial orientations. This paper investigates application of Cellular Automata (CA) for curvilinear fiber design of composite laminae for in-plane responses. CA use local rules to update both field and design variables in an iterative scheme till convergence. In the present study, displacement update rules are derived using a finite element model governing the equilibrium of the cell neighborhood and fiber angles are locally optimized based on a minimum strain energy criterion. A manufacturing improvement is applied on top of the local optimum orientation wherever this angle is not consistent with the cell neighborhood orientation trend. Numerical studies showed convergency of the local update rules and considerable improvements in the stiffness properties for a cantilever bending test and a square plate with a cutout.

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Optimization of tow fiber paths for composite design

Cited by 84 publications

References 8 publications

Bending Test of a Variable-Stiffness Fiber Reinforced Composite Cylinder

Bending Test of a Variable-Stiffness Fiber Reinforced Composite Cylinder

Variable-stiffness composite panels: Defect tolerance under in-plane tensile loading

Design of Composite Layers With Curvilinear Fiber Paths Using Cellular Automata

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