Effects of inter-fibre spacing and matrix cracks on stress amplification factors in carbon-fibre/epoxy matrix composites. Part I: planar array of fibres

Sirivedin, Suparerk; Fenner, D. N.; Nath, R.B.; Galiotis, Costas

doi:10.1016/s1359-835x(03)00252-5

Cited by 15 publications

(11 citation statements)

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“…effect of matrix cracking on the stress redistribution by introducing a conical-shaped matrix crack initiated from the fiber fracture into the FE model during an additional load step. [6] A numerical model of composite with matrix defects of three different shapes, including square, circular and hexagonal, were investigated by Li et al [7] Fiedler et al studied stress amplification in multi-fiber model composites by using a fiber with a pre-existing crack in their model; [8] However, the presence of matrix cracks in this composite model was neglected, as in the study done by Van den Heuvel et al [9] Analysis of the initial interface debonding which occurs around fiber breaks during tensile load was investigated by Zhou et al, based on an energy balance model. [10] From an overview of the literature regarding the fibrous composites damage research, it appears that the present numerical studies have mostly been performed only on one special damage mode, namely the local load transfer at the interface between fiber and matrix and the local stress concentration due to fiber break or matrix crack, [11][12][13][14][15][16][17] while few studies have yet been performed on the propagation of cracks towards the interface.…”

Section: Full Papermentioning

confidence: 99%

“…Crack propagation was simulated by deactivating the contact elements along the crack path during the final load steps. [6] But this model is far more intricate.…”

Section: Full Papermentioning

confidence: 99%

“…Microdamage analysis of fibrous composites has received considerable attention in recent years. [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] Herrera-Franco et al studied radial stresses at the interface during the fiber pulled out from the droplet using FEA analysis. [5] Sirivedin et al derived an analytical expression to estimate the…”

Section: Introductionmentioning

confidence: 99%

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Influence of Interfacial Properties on Crack Propagation in Fiber‐Reinforced Polymer Matrix Composites

Sun

Jia

et al. 2008

Macro Materials & Eng

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Dynamic crack propagation routes in composites were investigated using numerical methods. The interfacial strength was characterized by means of the interfacial nodal constrained failure. Five different micro‐damage modes around a broken fiber and the corresponding stress/strain curves were obtained with the interfacial strength increasing. It was proved that the shear stress concentration region appears to be different as the interface varying from weak to strong and that the recovery of fiber load‐supporting with a strong interface is better than that with a weak interface. Experimental work has been done and the available results agree well with corresponding simulation results.

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Section: Full Papermentioning

confidence: 99%

“…Crack propagation was simulated by deactivating the contact elements along the crack path during the final load steps. [6] But this model is far more intricate.…”

Section: Full Papermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of Interfacial Properties on Crack Propagation in Fiber‐Reinforced Polymer Matrix Composites

Sun

Jia

et al. 2008

Macro Materials & Eng

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“…[4][5][6] Some experimental data has been obtained by Raman spectroscopy, 7,8 including attempts to measure strains in the interior of composites by embedding optic probe fibres, used to transmit Raman spectra. 7 However as pointed out by Surgeon and Wevers, 9 the presence of larger diameter fibres affects the surrounding stress field and reduces the value of the measurements.…”

Section: Introductionmentioning

confidence: 99%

Imaging and strain mapping fibre by fibre in the vicinity of a fatigue crack in a Ti/SiC fibre composite

Sinclair¹,

Preuss²,

Withers³

2005

Materials Science and Technology

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High resolution X-ray micro-tomography has been combined with high spatial resolution diffraction measurements to map the relationship between damage and elastic strain in individual fibres in the bulk of a metal matrix composite containing a matrix fatigue crack in 3D for the first time. Approximately three plies bridge the transverse matrix fatigue crack. The interfacial shear stress distributions in individual bridging fibres have been derived from the respective axial fibre strain profiles. For each fibre these profiles indicate a step jump in interfacial shear stress at the boundary between sliding and perfect bonding. This sudden decrease is taken to be the result of a sharp drop in the sliding stress due to fretting fatigue. Furthermore, the sliding stress appears to decrease towards the matrix crack. The extent of fibre sliding makes a 'V' shape in the crack wake, extending around 1?5 mm either side of the crack for ply 1. There is some evidence supporting stick-slip and a lower reverse sliding stress (about 30-50 MPa) than the forward one (about 50-60 MPa).

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“…A special challenge is detection and localization of hidden defects, which can have many forms depending on the scale of the problem, eg. dislocations, voids or inclusions in microscale [43,49,44,3] to macroscopic defects, such as delamination in laminated composites [31] or welds in metallic materials [53,50]. The current work is focused on testing the applicability of dynamic vibration-based, as well as the space analysis methods to defect detection and localization in 1D (beam) structures.…”

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confidence: 99%

A numerical-experimental study on damaged beams dynamics

Samborski

Wieczorkiewicz

Rusinek

2015

EiN

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Article citation info: IntroductionIn many contemporary structures various types of defects can appear leading to significant reduction of the element rigidity and changing its overall mechanical behaviour. A special challenge is detection and localization of hidden defects, which can have many forms depending on the scale of the problem, eg. dislocations, voids or inclusions in microscale [43,49,44,3] to macroscopic defects, such as delamination in laminated composites [31] or welds in metallic materials [53,50]. The current work is focused on testing the applicability of dynamic vibration-based, as well as the space analysis methods to defect detection and localization in 1D (beam) structures. The vibration-based methods have been widely used in the plates and beams dynamics. For example, Manoach et al. [25,26,27,24,48] analysed the frequencies and modes of free vibrations in order to identify damage in beam and plates. The most interesting aspect of these papers was introduction of the so-called Damage Index exploiting the information given by the Poincaré maps [19]. The authors of the current study aimed at testing other dynamical methods towards detection and localization of defects in structures, which led them to reach for time series analysis.Experimental time series, especially nonlinear, can be analyzed by means of the method of delay coordinates, which allows to reconstruct a phase space and Poincaré section. This procedure is precisely described in [2,32] and can be applied for analysis of experimental signals obtained from different kinds of real processes [12,5] and numerical simulations [40]. For instance, the delay coordinate technique is used for researching dynamics of robot joints [47] and to analyse nonlinear system with dry friction [40]. Interesting contribution in the field of phase space reconstruction is presented in [7,8,36] in which the method of delay coordinates is employed for experimental and numerically generated signals, also with noise. Another example can be an impact and a self-excited oscillator with CoulombAmontons friction [13].On the basis of delay coordinates method, a recurrence plot technique is introduced to analyse linear or non-linear stationary and also non-stationary time series [30]. The formal concept of recurrences was introduced by Henri Poincaré in his seminal work from 1890 [37], for which he won a prize sponsored by King Oscar II of Sweden and Norway [30]. Therein, Poincaré did not only discover the homoclinic tangl which lies at the root of the chaotic behaviour of orbits, but he also introduced (as a by-product) the concept of recurrences in conservative systems. Even though much mathematical work was carried out in the following years, Poincaré's pioneering work and his discovery of recurrence had to wait for more than 70 years for the development of fast and efficient computers to be exploited numerically. The use of powerful computers boosted chaos theory and allowed to study new and exciting systems. Some of the tedious computations needed to use the c...

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Effects of inter-fibre spacing and matrix cracks on stress amplification factors in carbon-fibre/epoxy matrix composites. Part I: planar array of fibres

Cited by 15 publications

References 11 publications

Influence of Interfacial Properties on Crack Propagation in Fiber‐Reinforced Polymer Matrix Composites

Influence of Interfacial Properties on Crack Propagation in Fiber‐Reinforced Polymer Matrix Composites

Imaging and strain mapping fibre by fibre in the vicinity of a fatigue crack in a Ti/SiC fibre composite

A numerical-experimental study on damaged beams dynamics

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