Thin ply composites: Experimental characterization and modeling of size-effects

Amacher, R.; Botsis, J.; Sorensen, L.; Smith, W.H. .; Dransfeld, Clemens

doi:10.1016/j.compscitech.2014.06.027

Cited by 239 publications

(227 citation statements)

References 17 publications

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“…This enhanced compressive strength is attributed to the more uniform microstructure of spread tow thin plies. Optical micrographs presented by Amacher et al [21] show that the microstructure of high-grade composites is fairly inhomogeneous, with varying fibre volume fraction along the microstructure due to fibre rearrangement and resin flow during the low-viscosity phase of the curing cycle. This heterogeneous microstructure promotes instabilities at the constituent level that may result in premature compressive failure of the laminae [21].…”

Section: Introductionmentioning

confidence: 97%

“…Optical micrographs presented by Amacher et al [21] show that the microstructure of high-grade composites is fairly inhomogeneous, with varying fibre volume fraction along the microstructure due to fibre rearrangement and resin flow during the low-viscosity phase of the curing cycle. This heterogeneous microstructure promotes instabilities at the constituent level that may result in premature compressive failure of the laminae [21]. As the ply thickness decreases, a better uniformity of the microstructure is achieved, becoming practically homogeneous for the lowest grades, delaying the instabilities that conduct to fibre compressive failure, therefore increasing the compressive strength.…”

Section: Introductionmentioning

confidence: 97%

“…Amacher et al [21] performed an extensive experimental characterisation of the mechanical response of thin-ply laminates, including testing of UD carbon fibre-epoxy composites with ply areal weights ranging from ultra-thin to very high grades, all produced from the same batch of fibre and matrix. No significant influence of the ply thinness on the elastic and strength properties of the UD composites was observed, except for longitudinal compression, where an enhancement of approximately 20% in average was observed.…”

Section: Introductionmentioning

confidence: 99%

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Micro-mechanical analysis of the effect of ply thickness on the transverse compressive strength of polymer composites

Arteiro

Catalanotti

Melro

et al. 2015

Composites Part A: Applied Science and Manufacturing

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Please cite this article as: Arteiro, A., Catalanotti, G., Melro, A.R., Linde, P., Camanho, P.P., Micro-mechanical analysis of the effect of ply thickness on the transverse compressive strength of polymer composites, Composites: Part A (2015), doi: http://dx. AbstractA micro-mechanical model is used to study the effect of ply thickness on constrained 90 • plies subjected to transverse compressive loading (in situ effect). For cross-ply sublaminates with conventional, standard-thickness 90 • plies, failure is dominated by fibre-matrix interface cracking and large localised plastic deformation of the matrix, forming a localised band in a plane that is not aligned with the loading direction. Ultra-thin plies show a dispersed damage mechanism, combining wedge cracking with ply fragmentation/separation. Moreover, a transverse crack suppression effect is clearly observed. To the authors' knowledge, it is the first time an in situ effect in transverse compression has been identified. When comparing the results of the micro-mechanical model with the predictions from analytical models for the in situ effect, the same trends are obtained. These results also show that, for realistic ply thicknesses, these analytical models can be considered fairly accurate.

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Micro-mechanical analysis of the effect of ply thickness on the transverse compressive strength of polymer composites

Arteiro

Catalanotti

Melro

et al. 2015

Composites Part A: Applied Science and Manufacturing

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“…Due to the effect of the ply thickness of carbon/epoxy, composites with various ply thicknesses (30-300 g/m 2 prepreg weight per area (PPAW)) were investigated in terms of the ultimate strength and the onset of damage in lamina, laminates, and components. 17 Besides, the damage process was quite different; accumulation and growth of delamination and matrix cracks were observed in standard composites, while sudden fiber fractures occurred in thin-ply composites. 12 As shown in Table 1 The autoclave and the process timing of the autoclave used for the consolidation of multilayer CFRP sheets are shown schematically in Figure 1.…”

Section: Fabrication Of Specimensmentioning

confidence: 99%

Mechanical properties and drawing process of multilayer carbon-fiber-reinforced plastic sheets with various prepreg thicknesses

Sasayama

2017

Advances in Mechanical Engineering

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In this study, multilayer carbon-fiber-reinforced plastic sheets with various pre-impregnated thicknesses were developed. Specimens were fabricated by the hand lay-up process from standard and thin-ply unidirectional carbon fiber/epoxy resin prepreg sheets, which were also cured in an autoclave. Tensile tests from room temperature to 120°C and interlaminar shear strength tests at room temperature were first conducted to investigate the mechanical behavior of the laminated carbon-fiber-reinforced plastic sheets. Furthermore, with a view to increase the formability, in this study, a state-of-theart drawing process for laminated carbon-fiber-reinforced plastic sheets at an elevated temperature was investigated, and the drawing ratio was also determined for the case of elliptical cup drawing. To achieve this, the relation between the punch load and stroke, and the distribution of thickness were determined by measurement. To clarify the forming behavior in this case, evaluation of the effect of increasing the number of drawing steps was performed to investigate the deformation history. The microstructures showed reduced delamination with increasing radius of the punch. The experimental results obtained in this study are expected to help designers perform the press forming of multilayer carbon fiber/epoxy resin sheets.

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“…Both were designed using thin ply (<50 µm) CFRP textile reinforced laminates (with or without a foam core), the actual reinforcement textile considered being TeXtreme ® , produced by Oxeon AB. Research has shown that such thin-ply CFRP laminates exhibit a higher ultimate tensile strength and an increased resistance to intralaminar crack propagation comparing to the conventional thick-ply CFRP [5].…”

Section: Numerical Modelling and Simulation Of Proposed New Design Comentioning

confidence: 99%

Increased Impact Resistance of Cross-Country Ski Poles by Improved, Simulation Assisted Composite Design

Granlund

Gräsberg

Zrida

et al. 2018

The 12th Conference of the International Sports Engineering Association

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High-end carbon fibre reinforced polymer (CFRP) ski poles of today are lighter and stiffer than previous generations, explained by the higher specific stiffness (stiffness to density ratio) for CFRPs, typically in the range of 0.1 GPa m 3 /kg compared to approximately 0.03 GPa m 3 /kg for aluminium. In this study, we have analysed different CFRP pole designs on the market by mechanical testing and microscopy. We conclude that the strive for optimised weight and bending stiffness has generally driven the pole design to be sub-optimal towards stiffness making them unnecessarily sensitive to transverse and impact loads. Based on the experimental findings, we have developed numerical simulation models to predict the bending and stress state in CFRP ski poles under axial as well as transverse (impact) loading conditions. These numerical model has then been used to find a new conceptual pole design with similar weight and stiffness but with seemingly higher impact resistance.

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Thin ply composites: Experimental characterization and modeling of size-effects

Cited by 239 publications

References 17 publications

Micro-mechanical analysis of the effect of ply thickness on the transverse compressive strength of polymer composites

Micro-mechanical analysis of the effect of ply thickness on the transverse compressive strength of polymer composites

Mechanical properties and drawing process of multilayer carbon-fiber-reinforced plastic sheets with various prepreg thicknesses

Increased Impact Resistance of Cross-Country Ski Poles by Improved, Simulation Assisted Composite Design

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