Interlaminar fracture toughness of 5HS Carbon/PEEK laminates. A comparison between DCB, ELS and mandrel peel tests

Sacchetti, Francisco; Grouve, Wouter Johannes Bernardus; Warnet, Laurent; Villegas, Irene Fernández

doi:10.1016/j.polymertesting.2017.12.005

Cited by 24 publications

(14 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Hine et al [40] have reported that such unstable crack propagation in FRP composites is caused by local regions of high toughness. Thus, when the crack tip reaches a tougher region (for example, due either to a somewhat tougher region of the matrix or to fibre bridging having developed), crack propagation is retarded until the build-up of stored elastic energy becomes sufficient to reinitiate crack propagation [41]. However, upon reinitiation, the stored elastic energy is typically higher than required for stable propagation and the crack now propagates very rapidly in an unstable manner until it runs out of sufficient input energy for further growth and arrests.…”

Section: Mode I Double Cantilever Beam (Dcb) Test Resultsmentioning

confidence: 99%

On the extent of fracture toughness transfer from 1D/2D nanomodified epoxy matrices to glass fibre composites

et al. 2020

View full text Add to dashboard Cite

In this study, the effects of adding nanofillers to an epoxy resin (EP) used as a matrix in glass fibre-reinforced plastic (GFRP) composites have been investigated. Both 1D and 2D nanofillers were used, specifically (1) carbon nanotubes (CNTs), (2) few-layer graphene nanoplatelets (GNPs), as well as hybrid combinations of (3) CNTs and boron nitride nanosheets, and (4) GNPs and boron nitride nanotubes (BNNTs). Tensile tests have shown improvements in the transverse stiffness normal to the fibre direction of up to about 25% for the GFRPs using the 'EP ? CNT' and the 'EP ? BNNT ? GNP' matrices, compared to the composites with the unmodified epoxy ('EP'). Mode I and mode II fracture toughness tests were conducted using double cantilever beam (DCB) and end-notched flexure (ENF) tests, respectively. In the quasi-static mode I tests, the values of the initiation interlaminar fracture toughness, G C IC , of the GFRP composites showed that the transfer of matrix toughness to the corresponding GFRP composite is greatest for the GFRP composite with the GNPs in the matrix. Here, a coefficient of toughness transfer (CTT), defined as the ratio of mode I initiation interlaminar toughness for the composite to the bulk polymer matrix toughness, of 0.68 was recorded. The highest absolute values of the mode I interlaminar fracture toughness at crack initiation were achieved for the GFRP composites with the epoxy matrix modified with the hybrid combinations of nanofillers. The highest value of the CTT during steady-state crack propagation was * 2 for all the different types of GFRPs. Fractographic analysis of the composite surfaces from the DCB and ENF specimens showed that failure was by a combination of cohesive (through the matrix) and interfacial (along the fibre/matrix interface) modes, depending on the type of nanofillers used.

show abstract

Section: Mode I Double Cantilever Beam (Dcb) Test Resultsmentioning

confidence: 99%

On the extent of fracture toughness transfer from 1D/2D nanomodified epoxy matrices to glass fibre composites

et al. 2020

View full text Add to dashboard Cite

show abstract

“…The crack propagation was stable for each specimen. The response of the current ENF specimens is similar to that reported in the literature [17,28]. Mode-II fracture toughness was evaluated based on the compliance calibration method outlined in ASTM D7905 [21].…”

Section: Enf Results or Mode-ii Fracture Toughness Resultsmentioning

confidence: 99%

Properties of a thermoplastic composite skin-stiffener interface in a stiffened structure manufactured by laser-assisted tape placement with in situ consolidation

Bandaru

Clancy

Peeters

et al. 2019

Composite Structures

View full text Add to dashboard Cite

A critically important consideration of stiffened structural panels is the interfacial properties between skin and stiffener. In the present study a novel implementation of laser-assisted tape placement (LATP) was used to produce a representative skin-stiffener of a wingbox from carbon fibre reinforced PEEK. First, a stiffener is manufactured using this method and subsequently the skin is attached using the same method without need for a secondary bonding process. The interfacial properties between the skin and stiffener have been characterised in terms of interlaminar shear strength (ILSS) and fracture toughness (Mode-I and Mode-II) properties. LATP laydown direction and laser power was found to influence the skin-stiffener interface Mode-I fracture toughness, but not affect the Mode-II fracture toughness. The values of ILSS and fracture toughness compare favourably with those results reported in the literature, in particular for those reported for equivalent aerospace certified CF/PEEK material (APC-2).

show abstract

“…Wear resistance of glass fiber reinforced polymer/ carbon composites were widely improved with the optimum addition of nanofillers. [37][38][39][40][41][42] Scanning electron microscope examination [Cloisites 10A and 20A] under various loading conditions of I.30E [0, 1, 2, 3, and 4 wt%] nanomer was studied. The results showed that the addition of I.30E Nanoclay enhanced the hydrophobicity of the nanocomposite with a maximum improvement of about 40% at 4 wt% of loading.…”

Section: Study About Tensile and Flexural Behavior Glass Fiber Reinfo...mentioning

confidence: 99%

Environmental degradation and mechanical behavior of glass fiber reinforced polymer nanocomposites used in offshore applications

singh

Sharma

Chhibber

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

Present study aims at the variation of mechanical properties of glass fiber/epoxy composite under the effect of temperature, alkalinity, and rate of loading. Glass fiber reinforced polymer (GFRP) with plain epoxy and GFRP with 1–2% variation of Nanoclay were utilized for experimentation. Flexural testing of specimen at optimum percentage of Nanoclay in GFRP and epoxy was performed and after that pre-stretching of GFRP with plain epoxy and GFRP with optimum percentage of Nanoclay was conducted. Combined effect of moisture, alkali, and temperature on the degradation behavior of glass fiber reinforced polymers in different environments was studied. The macroscopic and microscopic behavior of the GFRP composite specimen and pure epoxy and Nanoclay reinforced epoxy exposed to varying hygrothermal loads has also been analyzed. Scanning electron microscope (SEM) was used to study the microscopic behavior of GFRP composites. X-Ray diffraction analysis of epoxy with 1%, 2%, and 3% Nanoclay addition was also performed. Tensile and flexural testing of specimen at different orientations such as 0°, 30°, 45°, 60°, and 90° were also studied. At 0° orientation, maximum average flexural strength of 295.04 MPa and 481.69 MPa was observed for plain glass fiber reinforced polymer and 2% Nanoclay/glass fiber reinforced polymer before hygrothermal loading. At 20% and 50% loading conditions the maximum flexural strength of 46.7 MPa for plain glass fiber reinforced polymer and 147.52 MPa for 2% Nanoclay/glass fiber reinforced polymer was observed before hygrothermal conditions. Maximum degradation in tensile strength (384.78 MPa at 50% loading) for 2% Nanoclay/glass fiber reinforced polymer after hygrothermal loading was observed in NaCl environment. Lower tensile strength observed for 1% of Nanoclay addition in pure epoxy as compared to the 0% and 2% mixing. There is decrease in tensile strength for specimen with 2% of Nanoclay in pure epoxy as compared to the 0% and 1% mixing. Tensile strength changed by moisture as well as mechanical loading of the glass composites. There is lesser degradation and significant increase in tensile strength of glass fiber reinforced polymer nanocomposite was observed when it exposed for lesser time period while tensile strength significantly reduced when specimen was exposed for longer time (3000 hr). After degradation in four different environments (four tanks) for 30 days intervals, SEM analysis of glass fiber reinforced polymer nanocomposite at pre-stretching of 20% and 50% loading was observed. At 20% loading there is lesser damage of glass fiber reinforced polymer nanocomposite with the formation of small irregular lumps were observed while at 50% loading there is significant damage of glass fiber reinforced polymer nanocomposite with the formation of voids of epoxy was clearly observed during SEM analysis.

show abstract

Interlaminar fracture toughness of 5HS Carbon/PEEK laminates. A comparison between DCB, ELS and mandrel peel tests

Cited by 24 publications

References 28 publications

On the extent of fracture toughness transfer from 1D/2D nanomodified epoxy matrices to glass fibre composites

On the extent of fracture toughness transfer from 1D/2D nanomodified epoxy matrices to glass fibre composites

Properties of a thermoplastic composite skin-stiffener interface in a stiffened structure manufactured by laser-assisted tape placement with in situ consolidation

Environmental degradation and mechanical behavior of glass fiber reinforced polymer nanocomposites used in offshore applications

Contact Info

Product

Resources

About