The stress-strain behaviour of a porous unidirectional ceramic matrix composite

Keith, William P.; Kedward, Keith T.

doi:10.1016/0010-4361(95)91379-j

Cited by 37 publications

(26 citation statements)

References 14 publications

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“…If matrix cracking and interface debonding are present upon first loading, stress-strain hysteresis loops will develop as a result of energy dissipation through frictional sliding between the fiber and matrix during unloading and subsequent reloading [4,6,7,[11][12][13][14][15][16][17][18][19][20][21]. The shape, size and location of the hysteresis loops depend on the interface debonding and slipping.…”

Section: Hysteresis Theoriesmentioning

confidence: 99%

“…Pryce and Smith [14] investigated the hysteresis loops when interface partially debonding based on the assumption of purely frictional load transfer between the fiber and matrix. Based on the Pryce-Smith model, Keith and Kedward [15] investigated hysteresis loops when fiber/matrix interface completely debonded. Ahn and Curtin [16] investigated the effect of matrix stochastic cracking on hysteresis loops by assuming the two-parameter Weibull distribution of matrix flaw and compared with the Pryce-Smith model.…”

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confidence: 99%

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An Approach to Estimate Interface Shear Stress of Ceramic Matrix Composites from Hysteresis Loops

Song

2009

Appl Compos Mater

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An approach to estimate interface shear stress of ceramic matrix composites during fatigue loading has been developed in this paper. By adopting a shear-lag model which includes the matrix shear deformation in the bonded region and friction in the debonded region, the matrix crack space and interface debonding length are obtained by matrix statistical cracking model and fracture mechanics interface debonding criterion. Based on the damage mechanisms of fiber sliding relative to matrix in the interface debonded region upon unloading and subsequent reloading, the unloading counter slip length and reloading new slip length are determined by the fracture mechanics method. The hysteresis loops of four different cases have been derived. The hysteresis loss energy for the strain energy lost per volume during corresponding cycle is formulated in terms of interface shear stress. By comparing the experimental hysteresis loss energy with computational values, the interface shear stress corresponding to different cycles can then be derived. The theoretical results have been compared with experimental data of three different ceramic composites.

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Section: Hysteresis Theoriesmentioning

confidence: 99%

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confidence: 99%

An Approach to Estimate Interface Shear Stress of Ceramic Matrix Composites from Hysteresis Loops

Song

2009

Appl Compos Mater

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“…Aveston et al 1 were the first to utilize this approach to model matrix cracking in brittle unidirectional ceramic composites using an energy balance approach. The basic assumptions used in the model can be listed as follows: (1) fibers are intact during loading, (2) matrix cracks are formed in planes perpendicular to the load direction and are equally spaced, (3) Poisson's effects, as well as fiber roughness effects, are neglected, and (4) the value of the interfacial shear stress is constant. 2 Pryce and Smith 3 developed stress-strain relationships for CMCs with multiple cracks using the shear lag theory.…”

Section: Introductionmentioning

confidence: 99%

Modeling of crack density in ceramic matrix composites

Gowayed

Ojard

Santhosh

et al. 2014

Journal of Composite Materials

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The feasibility of utilizing the shear lag theory to estimate crack density in fabric reinforced composites was investigated. A geometric model was constructed for the fabric and meshed using a hybrid finite element approach. The small segment of the yarn and the surrounding matrix enclosed within each element were treated as a unidirectional composite and the shear lag theory was used to estimate the crack density. Model results were compared to experimental data for a 5-harness satin melt-infiltrated SiC/SiC composite under tension and showed a pattern similar to experimental data with the model starting to accumulate cracks at a stress corresponding to the point of departure from linearity in the stressstrain curve while cracks were experimentally observed around 60 MPa higher. The model and experimental data had a similar value for the crack density at the saturation level. Sensitivity analysis showed that the crack density was highly sensitive to the fiber volume fraction in the load direction followed by the weave angle of the crimped segments of the yarns and the interfacial shear strength between the fibers and the matrix.

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“…Multiple investigations have defined the relationship between the damage mechanisms, the constituent properties and the tensile hysteresis behaviour of these materials [6][7][8][9][10][11]. Based on these studies, the tensile behaviours of CMCs are fairly well understood.…”

Section: Introductionmentioning

confidence: 98%