Understanding the mechanical behavior of fiber/matrix interfaces during push-in tests by means of finite element simulations and a cohesive zone model

Ojos, D. Esqué-de los; Ghisleni, R.; Battisti, Andrea; Mohanty, Gaurav; Michler, Johann; Sort, Jordi; Brunner, Andreas J.

doi:10.1016/j.commatsci.2016.02.009

Cited by 19 publications

(3 citation statements)

References 24 publications

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“…The deviation from the initial linear behaviour in the load–displacement curves (see Figure 34), associated with the debonding onset, could emerge at different load levels depending primarily on the loading rate and the temperature. This non-linear region, governed by the viscoelastic phenomena, is classified as the intermediate regime that separates the cohesive-dominated and the frictional regimes [385]. Regarding the effect of loading rate and temperature on the push-out test of CF-epoxy systems, both IFSS and stiffness increase with increased loading rate and decrease with increased temperature.…”

Section: Push-in/-out Testsmentioning

confidence: 99%

Methods and models for fibre–matrix interface characterisation in fibre-reinforced polymers: a review

AhmadvashAghbash,

Verpoest,

Swolfs

et al. 2023

International Materials Reviews

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The fibre-matrix interface represents a vital element in the development and characterisation of fibre-reinforced polymers (FRPs). Extensive ranges of interfacial properties exist for different composite systems, measured with various interface characterisation techniques. However, the discrepancies in interfacial properties of similar fibre-matrix systems have not been fully addressed or explained. In this review, first, the interface-forming mechanisms of FRPs are established. Following a discourse on three primary factors that affect the fibre-matrix interface, the four main interface characterisation methods (single-fibre fragmentation, single-fibre pull-out, microbond and fibre push-in/-out tests) are described and critically reviewed. These sections review various detailed data reduction schemes, numerical approaches, accompanying challenges and sources of reported scatter. Finally, following the assessment of several infrequent test methods, comprehensive conclusions, prospective directions and intriguing extensions to the field are provided.

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Section: Push-in/-out Testsmentioning

confidence: 99%

Methods and models for fibre–matrix interface characterisation in fibre-reinforced polymers: a review

AhmadvashAghbash,

Verpoest,

Swolfs

et al. 2023

International Materials Reviews

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“…It was able to simulate the spontaneous initiation and propagation of the debonding crack front. In [21] a parametric FE simulation study of a push-in test illustrated load separation in two regimes. First, the cohesive fiber−matrix interaction was investigated and then, with increasing load, a frictional contact between the debonded part of the fiber and the matrix was simulated.…”

Section: Introductionmentioning

confidence: 99%

3D X-ray Microscopy as a Tool for in Depth Analysis of the Interfacial Interaction between a Single Carbon Fiber and an Epoxy Matrix after Mechanical Loading

et al. 2021

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The benefit of fiber-reinforced composites originates from the interaction between the fiber reinforcement and the matrix. This interplay controls many of its mechanical properties and is of utmost importance to enable its unique performance as a lightweight material. However, measuring the fiber−matrix interphase strength with micromechanical tests, like the Broutman test, is challenging, due to the many, often unknown boundary conditions. Therefore, this study uses state-of-the-art, high-resolution X-ray computed microtomography (XRM) as a tool to investigate post mortem the failure mechanisms of single carbon fibers within an epoxy matrix. This was conducted at the example of single carbon fiber Broutman test specimens. The capabilities of today’s XRM analysis were shown in comparison to classically obtained light microscopy. A simple finite element model was used to enhance the understanding of the observed fracture patterns. In total, this research reveals the possibilities and limitations of XRM to visualize and assess compression-induced single fiber fracture patterns. Furthermore, comparing two different matrix systems with each other illustrates that the failure mechanisms originate from differences in the fiber−matrix interphases. The carbon fiber seems to fail due to brittleness under compression stress. Observation of the fiber slippage and deformed small fracture pieces between the fragments suggests a nonzero stress state at the fragment ends after fiber failure. Even more, these results demonstrate the usefulness of XRM as an additional tool for the characterization of the fiber−matrix interphase.

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“…The mismatch between the expansion coefficients of CF (−1~1.5 × 10 −6 / C in the axial direction and 5~10 × 10 −6 / C in the radial direction) and resin (~50 × 10 −6 / C) lead to different deformation. [11][12][13][14] Thermal stress, which accumulates at the CF/resin interface under cryogenic conditions, causes thermal stress damage to the CFRP and deterioration of cryotanks. An interface of good contact facilitates stress transferring through the CF/resin interface under cryogenic conditions.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of the cryogenic‐interfacial‐strength of carbon fiber composites by chemical grafting of graphene oxide/attapulgite on T300

Yan

Chu

et al. 2020

Polymer Composites

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A mismatch between the expansion coefficients of carbon fiber (CF, T300) and resin causes thermal deterioration at the interface of composite cryotanks. This study presents an effective method to enhance the cryogenic interfacial properties of a T300/epoxy (EP) composite, in which graphene oxide (GO)/attapulgite (ATP) hierarchical structures are chemically grafted onto the surface of T300. GO and ATP were sequentially assembled on the T300 surface, which changed the morphology of T300 and optimized the interfacial wettability of T300/EP. Surface topography and chemical bonding of grafted T300 fibers (T300-GO-ATP) were evaluated by SEM and XPS, respectively. Considering the functioning conditions of composite cryotanks, three cryogenic interfacial testing conditions were designed for the T300-GO-ATP/EP composites: −196 C, cryogenic cycling (from RT to −196 C), and immersion in liquid nitrogen (LN 2). The interfacial shear strength (IFSS) of T300-GO-ATP/EP composite at −196 C was 88.3 MPa, 53.1% stronger than that of T300/EP (57.6 MPa). Likewise, the IFSS of T300-GO-ATP/EP composites was tested under cryogenic cycling/immersion in LN 2 , which increased remarkably comparing to those of T300/EP under the same conditions. Results shows that GO/ATP suppress interfacial cracking and enhances the interfacial bonding of T300/EP at cryogenic temperatures through chemical bonding and nanointerlocking.

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Understanding the mechanical behavior of fiber/matrix interfaces during push-in tests by means of finite element simulations and a cohesive zone model

Cited by 19 publications

References 24 publications

Methods and models for fibre–matrix interface characterisation in fibre-reinforced polymers: a review

Methods and models for fibre–matrix interface characterisation in fibre-reinforced polymers: a review

3D X-ray Microscopy as a Tool for in Depth Analysis of the Interfacial Interaction between a Single Carbon Fiber and an Epoxy Matrix after Mechanical Loading

Enhancement of the cryogenic‐interfacial‐strength of carbon fiber composites by chemical grafting of graphene oxide/attapulgite on T300

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