Effect of fiber geometry on stress in fiber-reinforced composite materials

MacLaughlin, Thomas F.

doi:10.1007/bf02326519

Cited by 21 publications

(6 citation statements)

References 2 publications

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“…Statistically, the number of critical intersections could be controlled through careful choice of fibre length and tow size, minimising the number of bundle ends. In addition, the magnitude of the strain concentration may be managed through bundle end shape, by changing the chopped end from a perpendicular cut to one at 45°, distributing the stress from the longitudinal bundle end to a greater number of filaments in the transverse bundle, as considered in a similar study for single fibre composites [42].…”

Section: The Influence Of Bundle Endsmentioning

confidence: 99%

Heterogeneity of discontinuous carbon fibre composites: Damage initiation captured by Digital Image Correlation

Johanson

Harper

Johnson

et al. 2015

Composites Part A: Applied Science and Manufacturing

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Section: The Influence Of Bundle Endsmentioning

confidence: 99%

Heterogeneity of discontinuous carbon fibre composites: Damage initiation captured by Digital Image Correlation

Johanson

Harper

Johnson

et al. 2015

Composites Part A: Applied Science and Manufacturing

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“…A full spherical-end geometry is not representative of the actual fiber geometry, since the pattern of the stress distribution around a spherical-end is similar as a straight-end but the peak stresses at the end of the fiber are lower for a sphericalend geometry. 92 It is assumed that the adhesion between the fiber and matrix is perfect and remains so throughout the simulation. The fiber positions of the generated representative RVE, which consists of 15 fibers are shown in Figure 12.…”

Section: Geometrymentioning

confidence: 99%

Micromechanical analysis of age‐induced strength reduction in a multiaxially loaded short‐fiber reinforced thermoplastic

Wismans,

van den Broek,

van Breemen

et al. 2023

J of Applied Polymer Sci

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In this study, we demonstrate that the strength of a short‐fiber reinforced polymer as measured in uniaxial tension is not a good indicator for its strength under multiaxial loading conditions. To illustrate this fact, the influence of physical aging on the strength of a 20 wt% short‐fiber reinforced polycarbonate is studied for a uniaxial and biaxial loading condition. Results demonstrate that aging strongly reduces the strength in multiaxial loading, whereas, it increases in uniaxial loading. To rationalize these observations, a micromechanical analysis of the local stress state is performed using three‐dimensional (3D) representative volume elements (RVE) in combination with a constitutive model that adequately describes the intrinsic deformation response of the matrix. RVE simulations demonstrate that biaxial loading results in higher local hydrostatic stresses and triaxiality than the uniaxial loadcase for the composite system considered, and aging results in a shift towards higher values. The high triaxiality, the magnitude of the hydrostatic stress, and the shift in hydrostatic stress upon aging, presents a clear rationalization why physical aging induces a strength reduction in biaxial loading and not in uniaxial loading. These results highlight that care should be taken when predicting strength under complex loading conditions with only uniaxial data available.

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“…Stress concentration in short fiber composites were also investigated experimentally using photoelasticity technique by many researchers; such as, MacLaughlin and Salkind [4], Tyson and Davie [5], Schuster and Scala [6], Pih and Sutliff [7] and MacLaughlin [8,9]. A detailed literature review of this topic is beyond the scope of this paper.…”

mentioning

confidence: 99%

“…The only non-zero stress components are the axial stress in the fiber Of and the interfacial shear stress T. Further, it is assumed that both of and T depend only on the axial coordinate of the fiber. 4. The effect of different fiber end geometries is ignored.…”

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confidence: 99%

Stress Distribution of Aligned Short-Fiber Composites Under Axial Load

Sun

1984

Journal of Reinforced Plastics and Composites

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The objective of this paper is to investigate the normal and interfacial shear stress distribution of short-fiber composites under a force either parallel to the fiber or making some angle with the fiber. Different geometrical shapes of fiber end were taken into account. The geometrical shapes under investigations were: rectangular, semi-circular, V-shaped and wedge-shaped respectively.Analytical solutions of this problem were achieved by using finite-element numerical scheme. For the cases when the applied load is parallel to the fiber, very small triangular constant strain elements were used near the fiber tip and rectangular elements were used throughout the rest of the region. For the cases of off-axis loading parabolic-isoparametric elements were used throughout the entire domain. Depending upon the fiber volume fractions and fiber end geometry, the total time of calculation for each case is around 18 seconds.Numerical results of normalized normal stress σ f and shear stress τ were plotted as a function of the coordinate along the fiber direction. It was observed that, the distributions of σ f and τ were in good agreement with existing results obtained experimentally by using photoelasticity method. It was also observed that shear stress concentration is very high near the fiber tip. This phenomenon is particularly true for wedge and V-shaped fiber ends.A possible application of this investigation is to optimize internal damping of shortfiber composites by properly adjusting fiber end geometry. It is believed that the presence of high shear stress concentration at numerous fiber ends in short-fiber composites will transfer to the viscoelastic matrix. The viscoelastic matrix will then dissipate energy and thus improve internal damping of the composites.

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Effect of fiber geometry on stress in fiber-reinforced composite materials

Cited by 21 publications

References 2 publications

Heterogeneity of discontinuous carbon fibre composites: Damage initiation captured by Digital Image Correlation

Heterogeneity of discontinuous carbon fibre composites: Damage initiation captured by Digital Image Correlation

Micromechanical analysis of age‐induced strength reduction in a multiaxially loaded short‐fiber reinforced thermoplastic

Stress Distribution of Aligned Short-Fiber Composites Under Axial Load

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