Journal ArticleDOI
Effect of modulus ratio on stress near a discontinuous fiber
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TLDR
In this article, the effect of the fiber to matrix modulus of elasticity ratio varying from 10 to 200 was investigated for a two-dimensional plane-stress composite configuration having a simulated fiber volume fraction of 045 and containing a discontinuous fiber Uniaxial loading parallel to the fibers was considered.Abstract:
The effect of the fiber to matrix modulus of elasticity ratio varying from 10 to 200 was investigated for a two-dimensional plane-stress composite configuration having a simulated fiber volume fraction of 045 and containing a discontinuous fiber Uniaxial loading parallel to the fibers was considered Two independent techniques were used: moire strain analysis and finite-element analysis Displacements were measured from four experimental models by utilizing optical fringe-multiplication techniques The finite-element method yielded stresses which agreed closely with those obtained from the experimental analysis Matrix stress-concentration factor near the discontinuous fiber was found to increase rapidly with increasing modulus ratio, reaching a value of 20 for a modulus ratio of 200 The finite-element method was shown to be a valuable tool for micromechanical stress analysis of composite materials, and the accuracy of strain analysis by moire-fringemultiplication techniques was demonstrated for problems containing sever strain gradientsread more
Citations
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A theoretical study of the effect of an interfacial layer on the properties of composites
TL;DR: In this article, a theoretical analysis using finite element methods has been applied to oriented short-fiber composites and spherical particle composites in order to predict the influence of a finite layer at the interface on mechanical properties.
Journal ArticleDOI
A microdebonding test for in situ assessment of fibre/matrix bond strength in composite materials
TL;DR: In this paper, a test technique which gives a quantitative measure of the in situ fibre/matrix bond strength in fiber-reinforced composite materials is described. But the test involves the compressive loading of a fibre or region of fibres on a polished specimen surface to produce debonding.
Journal ArticleDOI
A simple development of the shear lag theory appropriate for composites with a relatively small modulus mismatch
TL;DR: In this article, a simple postulate is made that this stress will approximate to the mean between the peak value in the fibre and the average value of the matrix remote from the interface, and simple analytical expressions are derived for composite stiffness and applied stress at the onset of yielding.
Journal ArticleDOI
Theoretical aspects of the fragmentation test
TL;DR: In this paper, the authors present a review of the status of the fragmentation test and especially the modelling of the test, and the limits of one-dimensional models are defined and the quality of bidimensional models is outlined.
Journal ArticleDOI
Measurement of the thermomechanical stability of interphases by the embedded single fiber test
TL;DR: In this article, it was shown that the fracture energy of E-glass and carbon fiber reinforced polymer composites can be characterized by a fragment length distribution, and that the mode of failure in most instances can be characterised by a fracture energy criterion.
References
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Journal ArticleDOI
Matrix and Interface Stresses in a Discontinuous Fiber Composite Model
TL;DR: In this article, the method of finite element analysis is applied to an axially symmetrical model of a single filament glass-resin composite under tension, and fiber end geometries are varied by considering ellipsoids.
Journal ArticleDOI
Analysis of moiré fringe multiplication phenomena.
TL;DR: The theory of moiré fringes is extended to this case of grossly dissimilar grating frequencies and the combination of a symmetrical double-order blazed reference grating with a coarse bar-and-space active grating appears most attractive for many metrological applications.
Journal ArticleDOI
A Photoelastic Analysis of Fiber Discontinuities in Composite Materials
TL;DR: In this paper, a two-dimensional photoelastic stress analysis of various fiber-reinforced composite material configurations is described, and the effects of lateral fiber spacing on matrix stress concentration and on critical fiber aspect ratio are observed.
Journal ArticleDOI
New optical methods of moiré fringe multiplication
TL;DR: In this paper, three methods are described and multiplication by factors as high as 30 are demonstrated. But they apply to both bar-and-space screens and transparent diffraction gratings.
Journal ArticleDOI
Stress Concentrations Near a Discontinuity in Fibrous Composites
TL;DR: In this paper, the authors defined stress concentration factors for the fiber and matrix in an axially loaded unidirectional composite which has a discontinuous fiber effects of variations in fiber volume fraction, end-gap size, and modulus ratio are studied by using a linearly elastic finite-element analysis.
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