Hybridisation of CFRP by the use of continuous metal fibres (MCFRP) for damage tolerant and electrically conductive lightweight structures

Hannemann, Benedikt; Backe, S.; Schmeer, Sebastian; Balle, Frank; Breuer, Ulf Paul; Schuster, Jens

doi:10.1016/j.compstruct.2017.03.064

Cited by 36 publications

(19 citation statements)

References 7 publications

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“…Application of copper coated low carbon SF instead of conventional SF the electric conductivity could even be increased by a factor of 10.1 (10.4 vol.-% SF), respectively by a factor of 29.8 (18.8 vol.-% SF) compared to conventional carbon fiber reinforced polymers. In further investigations, dynamic impact tests on hybrid SF-CF laminates with a SF content of 20 vol.-% (CF replaced by SF) showed an energy absorption which is four times higher than that of the pure CF reference material [15,16].…”

Section: State Of the Artmentioning

confidence: 88%

“…In contrast to FML, the use of metal fibers offers many advantages. Furthermore, the large surface of many single fibers can improve fiber-matrix adhesion, while the impregnability of the hybrid preform is maintained due to the fibrous structure (in contrast to the metal foils in case of the FML) [14].…”

Section: State Of the Artmentioning

confidence: 99%

“…Most of the investigated SF hybrid laminates in the listed studies were made of flat semi-finished materials made of SF rovings, such as quasi-unidirectional woven structures (SF weft yarns and thin polymer warp yarns) or woven fabrics (SF weft and warp yarns) on the one hand and by filament winding technology on the other hand. For filament winding thin steel filaments were wound around a CF preform, whereby different layer structures and stacking sequences could be generated [9,[15][16][17][18][19][20].…”

Section: State Of the Artmentioning

confidence: 99%

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Dry fiber placement of carbon/steel fiber hybrid preforms for multifunctional composites

Kuhn

Rehra

May

et al. 2019

Advanced Manufacturing: Polymer & Composites Science

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Integration of steel fibers (SF) in carbon fiber (CF) reinforced polymer composites (CFRPC) allows improvement of electrical conductivity while maintaining excellent mechanical properties, since SF also contribute to the load-carrying capacity. Due to their high ductility, also energy absorption and structural integrity can be improved. Within this study, a preforming process for hybrid carbon/SF preforms based on dry fiber placement (DFP) is developed and validated. The investigations cover the production of bindered SF rovings, the production of hybrid preforms via DFP of spread and nonspread SF rovings on CF noncrimp fabrics (CF-NCF) as well as the production of hybrid laminates via vacuum-assisted resin infusion (VARI). The laminate quality was evaluated by microscopic images and mechanical tensile testing. A higher SF volume content within the SF areas and more homogeneous SF layers in the preform (fewer matrix-rich zones) were achieved by processing nonspread SF rovings. The more homogeneous SF layers within the samples with nonspread SF rovings compared to spread SF rovings led to higher stiffness and strength of the specimens for tension loadings and therefore to best results.

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Section: State Of the Artmentioning

confidence: 88%

Section: State Of the Artmentioning

confidence: 99%

Section: State Of the Artmentioning

confidence: 99%

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Dry fiber placement of carbon/steel fiber hybrid preforms for multifunctional composites

Kuhn

Rehra

May

et al. 2019

Advanced Manufacturing: Polymer & Composites Science

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“…Combining the advantages of metal-and fibre-reinforced polymers is the basic idea of fibre-metal laminates 11 such as Glare and ARALL, which are relatively well studied and successfully applied by the integration of metallic sheets or foils. 25 A correlation between changes of magnetic properties and fatigueinduced damage of MCFRP laminates would be a further major improvement for maintenance and damage monitoring in future composite structures for aircraft applications. In this case, the fibre-based approach allows stress-tailored design and multiple-shaped structures.…”

Section: Introductionmentioning

confidence: 99%

“…24 The functionality of this unique method for structural health monitoring was already successfully applied in the case of impact damages. 25 A correlation between changes of magnetic properties and fatigueinduced damage of MCFRP laminates would be a further major improvement for maintenance and damage monitoring in future composite structures for aircraft applications.…”

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confidence: 99%

Fatigue properties of multifunctional metal‐ and carbon‐fibre‐reinforced polymers and intrinsic capabilities for damage monitoring

Backe

Balle

Hannemann

et al. 2018

Fatigue Fract Eng Mat Struct

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Carbon‐fibre‐reinforced polymers (CFRP) structures offer enhanced lightweight potential in comparison with monolithic metallic concepts. Brittle failure behaviour and the insufficient level of electrical conductivity limit the lightweight potential of composites. One promising new approach to solve these issues is the additional integration of metal fibres. Structural components are subjected to cyclic loads during their lifetime. Therefore, the present study focuses on the influence of additional steel fibre reinforcement on the fatigue behaviour of CFRP laminates. Magnetic properties are determined because of the deformation‐induced phase transformation of the chosen austenitic steel fibres, which are also applied as intrinsic damage sensors. Interrupted fatigue tests are carried out accompanied by scanning electron microscopy to obtain differences in failure mechanisms. Beside a detailed overview of the steel fibre influence on the fatigue properties of conventional CFRP structures, the functional evidence of a new method for nondestructive testing by a magnet inductive measuring device is shown.

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Approach for an Analytical Description of the Failure Evolution of Continuous Steel and Carbon Fiber Hybrid Composites

et al. 2018

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The integration of ductile continuous steel fibers into thermoset carbon fiber reinforced polymer (CFRP) enables significant enhancements of its damage tolerance and crashworthiness. Due to their high strain at failure, the embedded steel fibers provide alternative load paths after failure of the brittle carbon fibers. The resulting post damage performance of the hybrid composite depends on the proportions of the different types of reinforcing fibers, their individual properties, the laminate architecture, and particularly on the steel fiber resin adhesion. So far, common constitutive laws for fiber reinforced composites have very limited suitability for the complex interrelation between the nonlinear plastic behavior of steel fibers and the elastic behavior of the carbon fibers. For this reason, a novel analytical method is developed to predict the failure performance of fiber hybrid composites. In principle, the analytical approach is based on a structural dynamic analysis of the fracture gap formation during failure and thus unloading of the brittle carbon fibers. The present paper covers the derivation of this analytical approach and its exemplary application to a steel and carbon fiber reinforced hybrid composite. A final comparison with an experimentally obtained stressstrain curve validates the theoretical model introduced.

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Hybridisation of CFRP by the use of continuous metal fibres (MCFRP) for damage tolerant and electrically conductive lightweight structures

Cited by 36 publications

References 7 publications

Dry fiber placement of carbon/steel fiber hybrid preforms for multifunctional composites

Dry fiber placement of carbon/steel fiber hybrid preforms for multifunctional composites

Fatigue properties of multifunctional metal‐ and carbon‐fibre‐reinforced polymers and intrinsic capabilities for damage monitoring

Approach for an Analytical Description of the Failure Evolution of Continuous Steel and Carbon Fiber Hybrid Composites

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