Strength and reliability of fiber-reinforced composites: Localized load-sharing and associated size effects

Ibnabdeljalil, M.; Curtin, W.A.

doi:10.1016/s0020-7683(96)00179-5

Cited by 172 publications

(87 citation statements)

References 41 publications

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“…Recently experimental and numerical analyses have been developed to evaluate this phenomenon. 8,9) Tensile elastic modulus of the 3D composites is also estimated by the simple analytical model based on the rule of mixtures. 18) This indicates that the tensile elastic modulus exhibits monotonic increase with the axial fiber volume fraction increasing.…”

Section: Specimen Size Effect On Tensile Properties In Fibermentioning

confidence: 99%

“…[5][6][7][8][9][10][11][12][13][14][15][16] Specifically the recent attention is paid on the following factors: (1) inside sub-micron flaws, (2) microstructure, (3) stress gradient and (4) test considerations. This technique cannot be established understanding of the influence of theses factors.…”

Section: Introductionmentioning

confidence: 99%

“…In contrast, the local load sharing theory assumes a non-uniform redistribution of load on the intact fibers. 8,9) Under this condition, the stress concentration around the broken fibers varies with the specimen size, resulting in another size effect. It is reported that failure strength decreases as laminate thickness decreases, due to increasing stress concentration.…”

Section: Introductionmentioning

confidence: 99%

“…It is reported that failure strength decreases as laminate thickness decreases, due to increasing stress concentration. 8,9) The microstructure of the composites is also important in determining the defects that may give rise to a size effect. The constituent fibers and matrices themselves are subject to damage during processing and machining, producing the defects responsible for ultimate composite failure.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Tensile Properties of SiC/SiC Composites with Miniaturized Specimens

Nozawa

Katoh

2005

Mater. Trans.

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Mechanical testing after neutron irradiation is a critical research tool for evaluating materials for fusion systems, such as silicon carbide fiber silicon carbide matrix (SiC/SiC) composites. However, single-axis tensile testing, which is required to build a fundamental database, requires large specimens. Therefore miniaturization of tensile test specimens has long been pursued as a method to reduce the irradiation volume to fit the capsule size limitation. The objective of this study is to identify specimen size effects on tensile properties of SiC/SiC composites from the viewpoints of the influences of fabric architecture and tensile loading axis, with a final goal to establish a small specimen test technique for tensile testing of the composites. The axial fiber volume fraction plays an important role in achieving good tensile properties. However the size dependent change of the axial fiber volume fraction gives specimen size effect. The composites with much fiber volume content tended to have superior tensile strength, elastic modulus and proportional limit stress. Contrarily, the tensile properties of the composites with the same axial fiber volume fraction were almost independent of the specimen size. This type of size effect is generally common in any types of architecture. The size-relevant fracture mode in off-axis tension: detachment in shorter widths vs. in-plane shear at larger widths, also gives specimen size effect on tensile properties, resulting in strict limitation of miniaturization of the tensile specimen. Finally we proposed a miniature tensile specimen for the composites.

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Section: Specimen Size Effect On Tensile Properties In Fibermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Evaluation of Tensile Properties of SiC/SiC Composites with Miniaturized Specimens

Nozawa

Katoh

2005

Mater. Trans.

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“…However, stress redistribution in actual heterogeneous materials should fall somewhere in between LLS and GLS since there is an important fraction of stress redistributed to other intact elements not localized in the neighborhood of the failed ones, nevertheless maintaining stress concentrations around the broken fibers. With this aim, several studies have been carried out during the last two decades and Monte Carlo simulations have been used to numerically study the distribution of composite strengths in 2D and 3D for different fiber arrangements [16,[25][26][27][28][29]. Nevertheless, in order to obtain reliable con-clusions the number of fibers forming the system has to be very large which makes the numerical problem, in many cases, too time consuming as to perform the study in a reasonable amount of time.…”

Section: Introductionmentioning

confidence: 99%

Fracture model with variable range of interaction

et al. 2002

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We introduce a fiber bundle model where the interaction among fibers is modeled by an adjustable stress-transfer function which can interpolate between the two limiting cases of load redistribution, the global and the local load sharing schemes. By varying the range of interaction several features of the model are numerically studied and a crossover from mean field to short range behavior is obtained. The properties of the two regimes and the emergence of the crossover in between are explored by numerically studying the dependence of the ultimate strength of the material on the system size, the distribution of avalanches of breakings, and of the cluster sizes of broken fibers. Finally, we analyze the moments of the cluster size distributions to accurately determine the value at which the crossover is observed..

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