A Critical Evaluation of the Use of the Microbond Method for Determination of Composite Interfacial Properties

Haaksma, Rebecca A.; Cehelnik, Marilyn J.

doi:10.1557/proc-170-71

Cited by 14 publications

(3 citation statements)

References 10 publications

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“…Ozzello et a1.l' and Haaksma et a1. 16 have also made references to diffusion being a problem when conducting microbond tests though no attempts were made to quantify the phenomenon.…”

Section: Discussion Of Resultsmentioning

confidence: 99%

A Direct Comparison of the Fragmentation Test and the Microbond Pull-out Test for Determining the Interfacial Shear Strength

Rao

Herrera‐Franco

Ozzello

et al. 1991

The Journal of Adhesion

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Experiments were conducted to compare the fragmentation test with the microbond pull-out test for determining the interfacial shear strength between carbon AS4 fibers and a thermoset matrix consisting of a Di-Glycidyl Ether of Bisphenol A (DGEBA) resin cured with a diamine (metaphenylenediamine, m-PDA) curing agent. The results indicate that, for the microbond test, diffusion of the rather volatile m-PDA curing agent at early stages of cure leads to low values of interfacial shear strengths when compared with results obtained for the same system with the fragmentation test.With the microbond test, a distinct relationship between the glass transition temperature of the droplets and their size is noticed. Smaller (<150ym) droplets have very low Tg's and are incompletely cured. While changing to a modified curing cycle and/or using a m-PDA-rich curing environment alleviates the diffusion problem, the interfacial shear strength values are still not in good agreement with the fragmentation test results. Microbond data from another system consisting of DGEBA resin cured with a different, less volatile dimaine curing agent indicates that diffusion of the curing agent becomes less severe as the volatility of the curing agent decreases and the corresponding microbond interfacial shear strengths agree better with fragmentation test results.KEY WORDS Single fiber fragmentation test; microbond pullout test; interfacial shear strength; interface; fiber-matrix adhesion; variable stoichiometry effect on epoxy properties.

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“…Ozzello et a1.l' and Haaksma et a1. 16 have also made references to diffusion being a problem when conducting microbond tests though no attempts were made to quantify the phenomenon.…”

Section: Discussion Of Resultsmentioning

confidence: 99%

A Direct Comparison of the Fragmentation Test and the Microbond Pull-out Test for Determining the Interfacial Shear Strength

Rao

Herrera‐Franco

Ozzello

et al. 1991

The Journal of Adhesion

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“…The literature has previously documented microscale curing challenges in thermosetting resin systems even before the introduction of the microbond test [356]. These concerns have been acknowledged as areas for improvement in some of the earliest critical reviews of microbond [319] and micromechanical [293] testing methods. However, there has been limited substantial effort to directly address this issue, despite the growing adoption of the microbond test.…”

Section: Discussionmentioning

confidence: 99%

“…This opens up the potential for scaling problems that can lead to unexpected and substantial disparities in the properties and performance of these droplets when compared to larger-scale specimens even with similar thermal and environmental exposure [318]. In an infrequently referenced study, Haaksma and Cehelnik [319] noted several problems with microdroplet specimen preparation. These issues suggest potential challenges in scaling up the polymerisation process for thermosetting resins at this size.…”

Section: Specimen Design and Test Setupmentioning

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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Application of the microbond technique. IV. Improved fiber–matrix adhesion by RF plasma treatment of organic fibers

Biro

Pleizier

Deslandes

1993

J of Applied Polymer Sci

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SYNOPSISThe microbond technique is a modification of the single-fiber pullout test for measuring interfacial shear strength. Briefly, a cured microdroplet of material is debonded in shear from a single fiber. Ultra-high modulus polyethylene (Spectra) fibers and aramid fibers (Kevlar) were treated using a radio frequency plasma in order to increase the interfacial bond between the fibers and an epoxy resin. The treated fiber surface was subsequently analyzed by X-ray photoelectron spectroscopy (XPS) . Plasma treatment resulted in an increased concentration of oxygen containing functionalities on the fiber surface. The interfacial shear strength as determined by the microbond test increased by 118% for the Spectra fibers and by 45% for the Kevlar fibers with the same epoxy resin. Scanning electron microscopy indicated little change of the surface topography of either fiber following plasma treatment. Effects of friction and surface composition of the plasma-treated fibers is discussed. 0 1993 John Wiley & Sons, Inc.

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A Critical Evaluation of the Use of the Microbond Method for Determination of Composite Interfacial Properties

Cited by 14 publications

References 10 publications

A Direct Comparison of the Fragmentation Test and the Microbond Pull-out Test for Determining the Interfacial Shear Strength

A Direct Comparison of the Fragmentation Test and the Microbond Pull-out Test for Determining the Interfacial Shear Strength

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

Application of the microbond technique. IV. Improved fiber–matrix adhesion by RF plasma treatment of organic fibers

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