Determination of the interfacial normal strength using single fibre model composites

Meurs, P.F.M.; Schrauwen, B.A.G.; Schreurs, Pjg Piet; Peijs, T.

doi:10.1016/s1359-835x(97)00130-9

Cited by 9 publications

(4 citation statements)

References 15 publications

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“…The elastic modulus of the matrix is degraded once the von Mises stress in the matrix element exceeds the ultimate strength of the matrix. To observe how far this matrix damage penetrates in the direction of the tool movement, another model with Table 2 Mechanical properties of materials used in FE simulation [14][15][16][17][18][19][20][21][22][23] Material Property Fiber (carbon) Elastic constants (tension) disc experiments have been performed on unidirectional laminates with different orientations and it was seen that the coefficient of friction varied from 0.3 to 0.9 as the fiber orientation changed from 0°to 90°. However, no data for single fiber-tool coefficient is available and therefore coefficient of friction was taken as 0.3 between the fiber surface and tool.…”

Section: Finite Element Modeling Materials Properties and Boundary Comentioning

confidence: 99%

Micro-mechanical modeling of machining of FRP composites – Cutting force analysis

Rao

Mahajan

Bhatnagar

2007

Composites Science and Technology

203

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Section: Finite Element Modeling Materials Properties and Boundary Comentioning

confidence: 99%

Micro-mechanical modeling of machining of FRP composites – Cutting force analysis

Rao

Mahajan

Bhatnagar

2007

Composites Science and Technology

203

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“…Even though researchers had developed various techniques to study the interfacial shear properties at both quasi-static and dynamic loading rates, it was often observed that the initial debonding occurred in the transverse direction upon impact. 20 Thus, Gundel et al developed a cross-shaped sample with a single fiber placed in the center to study the interfacial normal stress. 14 The cross-shaped sample allowed debonding to initiate in the center of the sample in which the free edge effect can be avoided.…”

Section: Introductionmentioning

confidence: 99%

Rate effects on fiber–matrix interfacial transverse debonding behavior

Chu

Claus

Lim

et al. 2019

Journal of Composite Materials

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The rate effect of fiber–matrix interfacial debonding behavior of SC-15 epoxy with S-2 glass and aramid fiber reinforcements was studied via in-situ visualization of the transverse debonding event. In this study, the debonding force history, debonding initiation, debonding crack velocity, and crack geometry were characterized using a quasi-static load frame and a modified tension Kolsky bar at loading velocities of 0.25 mm/s and 2.5 m/s. Cruciform-shaped specimens were used for interfacial transverse debonding between SC-15 epoxy matrix and two types of fiber reinforcements. The load history and high-speed images of the debonding event were simultaneously recorded. A major increase was observed for the average peak debonding force and a minor increase was observed for the average crack velocity with increasing loading velocity. The crack geometry of the cruciform specimens under both loading velocities was also tracked. Scanning electron microscopy of the recovered specimens revealed the debonding direction along the fiber–matrix interface through angled patterns on the failure surface.

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“…This damage mechanism has been reported to be the most critical under transverse loading [1,19,20]. A variety of tests have been used to characterize the fiber/matrix interface: the pullout, the push-out, the three fiber and the microbond tests [1,21]. These methods experimentally measure the averaged fiber / matrix interfacial shear strength (IFSS).…”

Section: Introductionmentioning

confidence: 99%

In-situ Full Field Out of Plane Displacement and Strain Measurements at the Micro-Scale in Single Reinforcement Composites under Transverse Load

et al. 2019

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Micromechanics damage models applied to composites predict stresses and strains in the matrix and fibers as a function of the microstructure, constituting phases mechanical properties and load histories. Material parameters, like interface properties, are identified through inverse methods based on macroscopic stress-strain curves. Predictions are also benchmarked against macroscopic measurements. This situation does not capture local phenomena and hinders the robustness of the indentification/validation process. The purpose of this work is to provide full displacement and strain fields at the scale of a single fibre embedded into a matrix to allow the modelling community to either develop and identify micromechanics damage models or to benchmark their own predictions. Such data is critically lacking in the community. To that end, we have investigated three single fibers having radically different bonding strength with epoxy in addition to a bundle of about a hundred carbon fibers that were used as reinforcements of standard "dogbone" epoxy specimens. A laser scanning confocal microscope (LSCM) is used for micro digital image correlation (μDIC) during in-situ quasi-static tests of single-reinforcement dogbone specimens. For all specimens, damage initiated with fiber debonding at the free surface along the tensile direction. The crack then propagates around the interface while slightly growing along the fiber. The interfacial crack is shown to grow faster for couples with weak interfacial bonding. Strong fiber / matrix bonding is shown to stop Mode II transverse interfacial debonding which significantly delays specimen failure. Analysis of the LSCM micrographs with μDIC is used to provide measurements of displacements, strains, and measure depth during each test. The importance of out of plane displacements in interfacial debonding is highlighted. Out of plane displacement is shown to play a role in interfacial crack opening and growth and ought to be considered when studying or modeling damage in FRCs. μDIC is shown to be a promising technique to provide a better understanding of the damage mechanisms at the fiber or bundle scales and to determine interfacial toughness of a specific fibre / matrix couple in order to perform accurate damage modeling in FRCs. Displacement, strain, and confidence field results for each pixel from each experiment and at each time step are also provided in an extensive data package for detailed comparison with simulation results.

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Determination of the interfacial normal strength using single fibre model composites

Cited by 9 publications

References 15 publications

Micro-mechanical modeling of machining of FRP composites – Cutting force analysis

Micro-mechanical modeling of machining of FRP composites – Cutting force analysis

Rate effects on fiber–matrix interfacial transverse debonding behavior

In-situ Full Field Out of Plane Displacement and Strain Measurements at the Micro-Scale in Single Reinforcement Composites under Transverse Load

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