Interlaminar fracture toughness of aerospace-grade carbon fibre reinforced plastics interleaved with thermoplastic veils

Quan, Dong; Bologna, Francesca; Scarselli, Gianfranco

doi:10.1016/j.compositesa.2019.105642

Cited by 59 publications

(51 citation statements)

References 18 publications

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“…Furthermore, the interleaved laminates reveal the higher load force in the fluctuation stage accompanied with the smaller slope of crack propagation length-displacement curves, which demonstrated a higher fracture energy dissipation rate and slower crack propagation. Therefore, it indicates that the G IR values are significantly enhanced [37]. The R-curves of these laminates, which indicate the relationship between the G I and the crack propagation length, are displayed in Figure 5b.…”

Section: Mode I and Mode Ii Fracture Toughness Of Laminatesmentioning

confidence: 91%

Interlaminar Fracture Behavior of Carbon Fiber/Polyimide Composites Toughened by Interleaving Thermoplastic Polyimide Fiber Veils

et al. 2021

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Carbon fiber reinforced thermosetting polyimide (CF/TSPI) composites were interleaved with thermally stable thermoplastic polyimide (TPPI) fiber veils in order to improve the interlaminar fracture toughness without sacrificing the heat resistance. Both of the mode I and mode II interlaminar fracture toughness (GIC and GIIC) for the untoughened laminate and TPPI fiber veils interleaved laminates were characterized by the double cantilever beam (DCB) test and end notch flexure (ENF) test, respectively. It is found that the TPPI fiber veils interleaved laminates exhibit extremely increased fracture toughness than the untoughened one. Moreover, the areal density of TPPI greatly affected the fracture toughness of laminates. A maximum improvement up to 179% and 132% on GIC and GIIC is obtained for 15 gsm fiber veils interleaved laminate, which contributes to the existence of bicontinuous TPPI/TSPI structure in the interlayer according to the fractography analysis. The interlaminar fracture behavior at elevated temperatures for 15 gsm fiber veils interleaved laminate were also investigated. The results indicated that the introduction of thermally stable TPPI fiber veils could enhance the fracture toughness of CF/TSPI composites by exceeding 200% as compared to the untoughened one even as tested at 250 °C.

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Section: Mode I and Mode Ii Fracture Toughness Of Laminatesmentioning

confidence: 91%

Interlaminar Fracture Behavior of Carbon Fiber/Polyimide Composites Toughened by Interleaving Thermoplastic Polyimide Fiber Veils

et al. 2021

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“…Thermoplastic matrices along with CFs have increasing significance in their application since they have a high distortion temperature [ 128 , 129 , 130 , 131 , 132 , 133 , 134 ]. The composite strength with more or less perfect continuity is often controlled by the fibre/matrix interface.…”

Section: Matrix Materialsmentioning

confidence: 99%

Carbonaceous Materials Coated Carbon Fibre Reinforced Polymer Matrix Composites

et al. 2021

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Carbon fibre reinforced polymer composites have high mechanical properties that make them exemplary engineered materials to carry loads and stresses. Coupling fibre and matrix together require good understanding of not only fibre morphology but also matrix rheology. One way of having a strongly coupled fibre and matrix interface is to size the reinforcing fibres by means of micro- or nanocarbon materials coating on the fibre surface. Common coating materials used are carbon nanotubes and nanofibres and graphene, and more recently carbon black (colloidal particles of virtually pure elemental carbon) and graphite. There are several chemical, thermal, and electrochemical processes that are used for coating the carbonous materials onto a carbon fibre surface. Sizing of fibres provides higher interfacial adhesion between fibre and matrix and allows better fibre wetting by the surrounded matrix material. This review paper goes over numerous techniques that are used for engineering the interface between both fibre and matrix systems, which is eventually the key to better mechanical properties of the composite systems.

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“…Unidirectional carbon fibers with the areal weight of 300 g/m 2 density of 1.78 g/cm 3 and tensile modulus of 240 GPa, and unidirectional glass fibers with 330 g/m 2 (283 g/m 2 -1200 Tex along the 0 direction, 37 g/m 2 -68 Tex E-Glass stitching fibers along the 90 direction and stitch with 10 g/m 2 -76 Dtex) and a tensile elastic modulus of 80 GPa were used as reinforcing fibers. Araldite LY 564 resin and Hardener XB 3403 were used as the resin for the matrix purchased from Hunstman (USA).…”

Section: Materials and Manufacturing Proceduresmentioning

confidence: 99%

“…To address this major issue, several approaches have been proposed through the employment of multiscale reinforcements or interface modifications of fibers in CFRP laminates. [1][2][3][4][5] Despite the relative success of these methods, their industrial applicability is under question due to the complex and expensive processing procedures. Alternatively, fiber hybridization is emerged to be a simple approach with promising results regarding extending the reliability of CFRP.…”

Section: Introductionmentioning

confidence: 99%

Using digital image correlation for in situ strain and damage monitoring in hybrid fiber laminates under in‐plane shear loading

et al. 2021

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Utilizing resistive strain gauges for V-notch shear tests in fiber reinforced laminates is usually limited to low strain values due to technical uncertainties imposed by the measurement technique and also the progressive damage development in the notched region of the composite. Therefore, this study investigates an alternative approach by using digital image correlation system and further comparison with resistive strain gauge to identify the effect of heterogenous nature of damage development on measurement results. Moreover, glass/carbon fiber hybrid and non-hybrid laminates are tested in two major directions through the same approach to determine the effect of stacking sequence in spatial microdamage accumulation. It is shown that tailoring appropriate region of interest for full field strain measurement at various stages of loading enables proper monitoring of microdamage accumulation and thereby delivers a precise stressstrain behavior for hybrid and non-hybrid laminates. Comparison of the strain maps for hybrid laminates tested in 0 direction, shows that the presence of carbon plies at the surface results in uniform strain distribution between the notches of the test sample. In contrast, a non-homogeneous strain map with separate regions of high strain gradient are observed for hybrid specimens with glass plies at surface, which can cause underestimation of average shear strain by resistive strain gauges. On the other hand, it is shown that strain maps for hybrid samples tested at 90 configuration is analogous regardless of the stacking sequence, and damage accumulation in these samples is most likely related to relative volume fraction of various fibers in hybrid laminate.

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Interlaminar fracture toughness of aerospace-grade carbon fibre reinforced plastics interleaved with thermoplastic veils

Cited by 59 publications

References 18 publications

Interlaminar Fracture Behavior of Carbon Fiber/Polyimide Composites Toughened by Interleaving Thermoplastic Polyimide Fiber Veils

Interlaminar Fracture Behavior of Carbon Fiber/Polyimide Composites Toughened by Interleaving Thermoplastic Polyimide Fiber Veils

Carbonaceous Materials Coated Carbon Fibre Reinforced Polymer Matrix Composites

Using digital image correlation for in situ strain and damage monitoring in hybrid fiber laminates under in‐plane shear loading

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