Influence of Through-Thickness Pinning on Composite Shear Properties

Maurin, Romain; Baley, Christophe; Cartié, Denis; Davies, Peter

doi:10.1007/s10443-011-9196-9

Cited by 8 publications

(6 citation statements)

References 16 publications

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“…In this case, the plasticization of the network by water allows the system to finish crosslinking. Such a result was widely observed by different authors in the literature …”

Section: Resultssupporting

confidence: 81%

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Bi‐phasic water diffusion in sheet molding compound composite

Abdessalem

Tamboura

Fitoussi

et al. 2019

J of Applied Polymer Sci

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Sheet molding compound (SMC) composite has been studied under humid-aging conditions. Diffusion of water within the material, as measured by gravimetry, was found to be in good agreement with the "Langmuir-type" diffusion model developed by Carter and Kibler. In their theory, Carter and Kibler consider the existence of two types of water molecules in the material, «mobile» and «bound». In this study, these two types have been considered separately. Furthermore, Infrared spectroscopy (FTIR) analysis has been performed by decomposition of signals to study the fraction of free (mobile) and hydrogen-bounded water. Thermal analysis and microscopic observations were put forward to explain the two types of water molecules. In this contribution, we found a "bi-phasic" water diffusion. We suggest that the «mobile» water corresponding to the diffusion in the micro-porosities follows a Fickien kinetic, which turns to sigmoidal one at a specific time of immersion τ. Whereas the kinetic of «bound» water, referring to crosslinking and plasticization, follows a sigmoidal kinetic, which turns to Fickien behavior when the overall network is saturated.

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“…In this case, the plasticization of the network by water allows the system to finish crosslinking. Such a result was widely observed by different authors in the literature …”

Section: Resultssupporting

confidence: 81%

“…Such a result was widely observed by different authors in the literature. 9,41,42 In order to verify the hypothesis of the "postcrosslinking" reaction in the studied material, thermal analysis by DSC were performed on unaged samples and aged at 90 C after 120 h (corresponding to 320 s 0.5 / mm).…”

Section: Thermal Behaviormentioning

confidence: 99%

Bi‐phasic water diffusion in sheet molding compound composite

Abdessalem

Tamboura

Fitoussi

et al. 2019

J of Applied Polymer Sci

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“…Despite considerable scatters in all tests, it is observed that Z-pinning decreases the in-plane shear dominated fracture, as illustrated in the experiments with off-axis angles of 30° and 45°. Similar results have been reported in tension tests of ±45° laminates[25]. The failure strength for off-axis angle of 60° was not reduced by the presence of Z-pins, although the scatter for both tests is considerable.However, it is interesting to notice that the purely transverse compression strength was improved by Z-pinning.…”

supporting

confidence: 87%

Inter-fibre failure of through-thickness reinforced laminates in combined transverse compression and shear load

Cui

Melro

Yasaee

2018

Composites Science and Technology

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Extensive studies have been reported on the improvement of through-thickness reinforcement to inter-laminar performance of composite laminates; current understanding on the in-plane performance is relatively limited, although it is also concerned in industrial application. The influence of through-thickness reinforcement (Z-pinning) on the inter-fibre failure in compression of unidirectional laminates was investigated. Both unpinned and Zpinned laminates were tested at four different off-axis angles, representing different combinations of transverse compression and in-plane shear stress. It was found that the stiffness of Z-pinned laminates decreased significantly in all off-axis angles. The failure strain and strength were reduced in shear dominated failure modes, while improved in the compression dominated failure modes by the presence of the Z-pins. A further investigation on the angle of failure plane was carried out and a comparison with analytical failure models is presented.

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“…A low pin content (typically 0.5%-5% by volume) can significantly improve the in-plane shear strength, interlaminar fracture toughness, and impact damage resistance of laminates and also increase the ultimate failure strength of the composite joints by a crack bridging mechanism [4][5][6][7][8][9][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]. For these reasons, z-pinning has been used in high performance composites, such as the roll-over hoop bars of Formula 1 racing cars, and the air inlet ducts and bay doors of the FA-18 E/F SuperHornet [28,29].…”

Section: Introductionmentioning

confidence: 99%

Preparation of carbon fiber powder-coated Z-pins and experimental study on the mode I delamination toughening properties

et al. 2015

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In order to improve the adhesion property between the z‐pin and laminate, carbon fiber powder coating technique for z‐pins were developed. Four types of coating materials, 1 mm short chopped carbon fiber (CS), 50 mesh carbon fiber powder z‐pins (CF), 400 mesh carbon fiber powder (CP), and carbon nanotubes (CN), were coated on an impregnated fiber bundle before the curing of the resin of the z‐pins. The diameters of the four types of coated z‐pins were increased from 0.50 to 0.61 mm, 0.57 mm, 0.58 mm, and 0.54 mm, separately. To characterize the adhesion property of the z‐pin/laminate, single z‐pin pull‐out tests were conducted. The results indicated that carbon fiber powder coating could improve the interfacial adhesion property of the z‐pin/laminate effectively. The interfacial shear strength was increased around 1/3. CS, CF, and CP improved the mechanical interlock and bridging effect of the interface, while CN enhanced the adhesion effect of the reinforcing mode. To examine the interlaminar performance of the reinforced laminate, we also conducted double cantilever beam tests. It was found that the coated z‐pin, which was related to better interfacial adhesion property, corresponded to higher mode I interlaminar fracture toughness of z‐pinned laminates. POLYM. COMPOS., 37:3508–3515, 2016. © 2015 Society of Plastics Engineers

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Influence of Through-Thickness Pinning on Composite Shear Properties

Cited by 8 publications

References 16 publications

Bi‐phasic water diffusion in sheet molding compound composite

Bi‐phasic water diffusion in sheet molding compound composite

Inter-fibre failure of through-thickness reinforced laminates in combined transverse compression and shear load

Preparation of carbon fiber powder-coated Z-pins and experimental study on the mode I delamination toughening properties

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