Improvement of bearing strength of laminated composites

Crosky, A.; Kelly, Don; Li, R.; Legrand, Xavier; Hương, Nguyễn Thanh; Ujjin, R.

doi:10.1016/j.compstruct.2006.06.036

Cited by 61 publications

(35 citation statements)

References 8 publications

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“…However, for FRPs such as carbon fibre reinforced plastics (CFRPs), riveting is not a material-appropriate design, due to their low bearing strength and high notch sensitivity [1,2]. Therefore, different attempts to reduce the notch sensitivity of composites are utilised; e.g., local thickening of the laminate [3], optimised laminate layup and stacking sequence [4,5], local inserts [6], z-pinning [4,7] and hybridisation with other materials [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

CFRP Thin-Ply Fibre Metal Laminates: Influences of Ply Thickness and Metal Layers on Open Hole Tension and Compression Properties

et al. 2020

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Thin-ply laminates exhibit a higher degree of freedom in design and altered failure behaviour, and therefore, an increased strength for unnotched laminates in comparison to thick-ply laminates. For notched laminates, the static strength is strongly decreased; this is caused by a lack of stress relaxation through damage, which leads to a higher stress concentration and premature, brittle failure. To overcome this behaviour and to use the advantage of thin-ply laminates in areas with high stress concentrations, we have investigated thin-ply hybrid laminates with different metal volume fractions. Open hole tensile (OHT) and open hole compression (OHC) tests were performed with quasi-isotropic carbon fibre reinforced plastic (CFRP) specimens. In the area of stress concentration, 90° layers were locally substituted by stainless steel layers of differing volume fractions, from 12.5% to 25%. The strain field on the specimen surface was evaluated in-situ using a digital image correlation (DIC) system. The embedding of stainless steel foils in thin-ply samples increases the OHT strength up to 60.44% compared to unmodified thin-ply laminates. The density specific OHT strength is increased by 33%. Thick-ply specimens achieve an OHC strength increase up to 45.7%, which corresponds to an increase in density specific strength of 32.4%.

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Section: Introductionmentioning

confidence: 99%

CFRP Thin-Ply Fibre Metal Laminates: Influences of Ply Thickness and Metal Layers on Open Hole Tension and Compression Properties

et al. 2020

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“…Fiber steering of composite tows was investigated as a means of achieving increased strength or stiffness by Tosh and Kelly [4,5]. Also noteworthy are more recent publications by Crosky et al [6] and Li et al [7]. Extensive research on flat plates with tow-steered layups can be found in [8,9].…”

Section: Introductionmentioning

confidence: 95%

A Technique for Stiffness Improvement by Optimization of Fiber Steering in Composite Plates

Tabakov

Walker

2010

Appl Compos Mater

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A methodology for stiffness improvement by optimal orientation of fibers placed using fiber steering techniques of composite plates has been developed and is described here. A genetic algorithm is employed to determine the optimal orientation of the tow fibers and, in addition, once the plate has been divided up into cells in order to apply the technique, the orientation gradient between adjacent cells is capped. The finite element method (FEM) is used to determine the fitness of each design candidate. The approach developed also differs from existing ones by having a more sophisticated chromosome string. By relying on the algorithm for the calculation of the fiber orientation in a specific cell, a relatively short and rapid convergence string is assembled. The numerical results obtained show a significant improvement in stiffness when the fiber orientation angle is allowed to vary spatially throughout the ply.

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“…However, as the number of control variables is usually relatively larger, the heuristic algorithms are more commonly used in the variable-stiffness composite optimization. The GA may be the most widely used heuristic algorithm in variable-stiffness composite optimization [43][44][45][46][47], and other methods are also involved, such as artificial immune algorithm [48] and evolutionary algorithm [49]. In engineering problems, the optimization objective functions are usually calculated by computational expensive simulations, which will lead to a low efficiency of optimization, especially when heuristic algorithms are used.…”

Section: Introductionmentioning

confidence: 99%

An efficient reanalysis assisted optimization for variable-stiffness composite design by using path functions

Huang

Wang

2016

Composite Structures

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Improvement of bearing strength of laminated composites

Cited by 61 publications

References 8 publications

CFRP Thin-Ply Fibre Metal Laminates: Influences of Ply Thickness and Metal Layers on Open Hole Tension and Compression Properties

CFRP Thin-Ply Fibre Metal Laminates: Influences of Ply Thickness and Metal Layers on Open Hole Tension and Compression Properties

A Technique for Stiffness Improvement by Optimization of Fiber Steering in Composite Plates

An efficient reanalysis assisted optimization for variable-stiffness composite design by using path functions

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