Adhesional pressure as a criterion for interfacial failure in fibrous microcomposites and its determination using a microbond test

Zhandarov, Serge; Gorbatkina, Yulia; Mäder, Edith

doi:10.1016/j.compscitech.2006.03.023

Cited by 27 publications

(18 citation statements)

References 64 publications

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“…Continuum damage models have been developed 23,24 to predict the initiation and evolution of the failure at the fibre/matrix interface. Stress-based criteria using ultimate IFSS Τ ult 30,31 and energy-based criteria using critical energy release rate, G ic , are considered to be material constants that can be determined from Raman spectroscopy data or microdroplet testing respectively. 32 Damage propagation requires the local interfacial stress to exceed Τ ult or the potential energy release rate to exceed G ic at the crack tip.…”

Section: Fe Modelling For Microdroplet Testmentioning

confidence: 99%

Finite element study of the microdroplet test for interfacial shear strength: Effects of geometric parameters for a carbon fibre/epoxy system

Zhao

Qian

Harper

et al. 2017

Journal of Composite Materials

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A 3D finite element model has been developed to identify the main causes of variability in the microdroplet test, which is commonly used to characterise the interfacial shear strength between polymer matrices and single filaments. A more realistic droplet shape and test configuration, including meniscus details and prismatic shear blades, have been modelled for a carbon fibre/epoxy system to simulate a more representative set up than is commonly used in the literature. The interfacial behaviour has been modelled using a cohesive surface contact and fibre breakage has been captured using a maximum stress criterion. A statistical study has been performed to systematically evaluate the influence of key geometrical test parameters on the variability in the measured interfacial shear strength values and the likelihood of fibre breakage. Parameters studied are fibre embedded length, fibre diameter, shear blade radial opening distance and shear blade axial misalignment. Results of the studied carbon fibre /epoxy system suggest that fibre embedded length and the combined effects of the shear blade radial distance and the shear blade axial misalignment are the most significant sources of variability for the measured interfacial shear strength. However, fibre embedded length and the shear blade radial distance are the most significant variables contributing to fibre breakage.

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Section: Fe Modelling For Microdroplet Testmentioning

confidence: 99%

Finite element study of the microdroplet test for interfacial shear strength: Effects of geometric parameters for a carbon fibre/epoxy system

Zhao

Qian

Harper

et al. 2017

Journal of Composite Materials

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“…According to Zhandarov [31], this normal stress component at the matrix interface corresponds to the tensile mechanism of crack initiation, and it is directly proportional to Wa, but considers the mechanical properties of the fibre and the matrix. As it can be seen in Table 3 and Figure 5, σ ult corresponds well with Wa if the analysis is made independently for each fibre.…”

Section: Pull-out Testmentioning

confidence: 99%

Mechanical behaviour and practical adhesion at a bamboo composite interface: Physical adhesion and mechanical interlocking

Fuentes

Brughmans

Tran

et al. 2015

Composites Science and Technology

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Physical adhesion was experimentally determined by measuring contact angles with different liquids on bamboo and glass fibers, using the Wilhelmy technique, and by applying the acid-base theory for calculating the surface energy components and the theoretical work of adhesion. The mechanical strength of the interfaces was assessed by single fibre pull-out tests. In order to consider the real mechanisms of interfacial failure of natural fiber composites, the fibre matrix interfacial bond strength was characterized by the critical local value of interfacial shear stress, , and the radial normal stress at the interface, σult, at the moment of crack initiation. Both interfacial parameters are used for correlating thermodynamic work of adhesion and practical adhesion. Pull-out tests (taking into account friction), XPS, and profilometry techniques were used to study the influence of rough natural fibre surfaces on the interface between the fibre and a thermoplastic matrix, by comparing the mechanical behaviour at the interface of a smooth optical glass fibre with that of rough natural fibres. The results suggest that the physical and chemical compatibility between the bamboo fibre and the matrix does not improve substantially the composite performance if compared with glass composites. The relatively low off-axis strength of the bamboo fibres is suggested as the main reason for the low stress transfer capability at the fibre-matrix interphase.Furthermore, the pull-out process may be friction-dominated in bamboo fibre systems.

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“…Fiber–matrix adhesion is characterized by a variety of testing methods including single‐fiber pull‐out and microbond,30–34 single‐fiber fragmentation,35–39 and single‐fiber pushout tests 40–44. Each of these single‐fiber tests enables the measurement of the interfacial shear strength (IFSS, τ ) between the fiber and matrix.…”

Section: Introductionmentioning

confidence: 99%

“…In this work, the single‐fiber microbond specimen is adopted for assessing the ability to heal interfacial damage and recover IFSS. Microbond samples consist of a single fiber embedded in a droplet or cylindrical block of matrix material ( Figure ) and were prepared in a manner similar to the flat cylindrical specimens described by Zhandarov et al30–34 During testing of a microbond specimen, the matrix is constrained and stress is transferred to the matrix‐reinforcement interface by pulling on the embedded fiber, which eventually leads to debonding 30–34…”

Section: Introductionmentioning

confidence: 99%

Autonomic Recovery of Fiber/Matrix Interfacial Bond Strength in a Model Composite

Blaiszik¹,

Baginska²,

White³

et al. 2010

Adv Funct Materials

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animals achieve material stasis via highly sophisticated autonomic repair and regenerative responses triggered by damage.Self-healing in synthetic materials has been demonstrated using a variety of methods such as incorporation of healingagent-fi lled capsules (capsule-based), [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] interconnected vascular networks [ 16 , 17 ] or discrete hollow capillaries, [18][19][20][21] or utilizing intrinsic properties of the material. [22][23][24][25][26] Capsule-based self-healing has been demonstrated in bulk thermoset matrices, [1][2][3][4][5][6][7][8][9] fi ber reinforced composite materials [10][11][12][13][14] and elastomers. [ 15 ] In these materials, damage triggers the rupture of the embedded capsules, releasing healing agent into the damaged material through capillary action. Polymerization of the healing agent is initiated by contact with an embedded catalyst or secondary polymerizing liquid.Efforts to develop self-healing fi berreinforced composites have focused on repair of large-scale delaminations and matrix cracking, but little attention has been given to repair of other composite damage modes. Complex damage modes in fi ber-reinforced composites such as matrix cracking, delamination, fi ber debonding, and fi ber rupture [ 27 , 28 ] present challenges beyond those addressed by self-healing in bulk polymers. In particular, debonding of the reinforcement from the matrix leads to a signifi cant loss of strength and stiffness of the composite by preventing effi cient load transfer from fi ber to matrix. [ 29 ] Additionally, small-scale damage, which may initiate at interfacial defects, can coalesce into large-scale damage during fatigue, ultimately leading to failure of the composite.Fiber-matrix adhesion is characterized by a variety of testing methods including single-fi ber pull-out and microbond, [30][31][32][33][34] single-fi ber fragmentation, [35][36][37][38][39] and single-fi ber pushout tests. [40][41][42][43][44] Each of these single-fi ber tests enables the measurement of the interfacial shear strength (IFSS, τ ) between the fi ber and matrix. In this work, the single-fi ber microbond specimen is adopted for assessing the ability to heal interfacial damage and recover IFSS. Microbond samples consist of a single fi ber embedded in a droplet or cylindrical block of matrix material ( Figure 1 ) and were prepared in a manner similar to the fl at cylindrical specimens described by Zhandarov et al. [30][31][32][33][34] During testing of a microbond specimen, the matrix is constrained and stress is transferred to the matrix-reinforcement interface by pulling on the embedded fi ber, which eventually leads to debonding. [30][31][32][33][34] Autonomic Recovery of Fiber/Matrix Interfacial Bond Strength in a Model CompositeAutonomic self-healing of interfacial damage in a model single-fi ber composite is achieved through sequestration of ca. 1.5 μ m diameter dicyclopentadiene (DCPD) healing-agent-fi lled capsules and recrystallized Grubbs' catalyst to the fi ber/m...

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Adhesional pressure as a criterion for interfacial failure in fibrous microcomposites and its determination using a microbond test

Cited by 27 publications

References 64 publications

Finite element study of the microdroplet test for interfacial shear strength: Effects of geometric parameters for a carbon fibre/epoxy system

Finite element study of the microdroplet test for interfacial shear strength: Effects of geometric parameters for a carbon fibre/epoxy system

Mechanical behaviour and practical adhesion at a bamboo composite interface: Physical adhesion and mechanical interlocking

Autonomic Recovery of Fiber/Matrix Interfacial Bond Strength in a Model Composite

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