The influence of imperfect interfaces on the measurable effective properties of ceramic composites

Bolzon, Gabriella; Pitchai, Pandi

doi:10.1080/09276440.2021.1942716

Cited by 3 publications

(4 citation statements)

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“…15 The formation of an imperfect interface, as observed in GMCs, could be attributed to several reasons including fiber-matrix incompatibility, air pockets, inability of matrix to infiltrate tows, etc. [16][17][18] It is evident that a partial interaction between the fibers and the surrounding matrix usually leads to a ductile response than that of a perfectly bonded case. In addition, the stiffness and strength of the interface may directly affect the stress distributions at the microstructure level.…”

Section: Introductionmentioning

confidence: 99%

The effect of imperfect bonding on stress distribution in fibrous composites

Kheirkhah Barzoki,

Hua,

et al. 2024

Journal of Composite Materials

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An attempt was made to map the distribution of stress in fibrous composites with imperfect bonding. Two analytical micro-mechanics models were developed. In the first model, the composite was subjected to axial tensile loading, parallel to the fiber direction, and the assumption of iso-strain was employed to derive the control equations. In the second model, the composite was loaded in the direction transverse to the fiber. An iso-stress condition was employed, and Airy stress function was utilized to articulate the stress and displacement equations. An assumption of how the stress is transferred between the matrix and the fiber was introduced in both models. To investigate and validate the models, specimens were fabricated using a carbon plain weave fabric and a geopolymer matrix. Single fiber pullout and three-point bending tests were carried out. The maximum average tensile stress obtained from the three-point bending tests, as well as the mechanical properties of the fiber and geopolymer, served as input for the models. Results indicate that the effect of the level of bonding is very high in the transverse direction while almost negligible in the axial direction. The difference in the maximum value of the axial tensile stress at the fiber-matrix interface was used to calculate the numerical value of the interfacial shear strength, and the numerical result matched the data obtained from the single fiber pullout test.

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Section: Introductionmentioning

confidence: 99%

The effect of imperfect bonding on stress distribution in fibrous composites

Kheirkhah Barzoki,

Hua,

et al. 2024

Journal of Composite Materials

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“…18,22,23 More often, they are considered as coupled surfaces of vanishing thickness, characterized by frictional or cohesive damaging behaviour. 11,21,[24][25][26][27] In all cases, the actual stress-transfer mechanisms can be identified only indirectly. 25 An alternative damaging scenario of metal-matrix composites assumes that plastic strains localize in the matrix, usually near the stiff reinforcement made of ceramic fibers or particles, which facilitate stress concentration.…”

Section: Introductionmentioning

confidence: 99%

“…11,21,24–27 In all cases, the actual stress-transfer mechanisms can be identified only indirectly. 25…”

Section: Introductionmentioning

confidence: 99%

“…11,21,[24][25][26][27] In all cases, the actual stress-transfer mechanisms can be identified only indirectly. 25 An alternative damaging scenario of metal-matrix composites assumes that plastic strains localize in the matrix, usually near the stiff reinforcement made of ceramic fibers or particles, which facilitate stress concentration. 9,14,[28][29][30] As a main consequence, the overall ductility is reduced, 10,[31][32][33] e.g.…”

Section: Introductionmentioning

confidence: 99%

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Surrogate analytical models of damage localization in metal matrix composites

Bolzon

Pitchai

Talassi

2023

Journal of Composite Materials

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Several parameters entering the constitutive laws of metal matrix composites are not amenable to direct measurement. Their determination is therefore demanded to indirect identification procedures, based on the comparison between the output of some experimental works and the results of the iterative simulation of the performed tests. Largely repetitive numerical analyses can also support the optimized design of composite microstructures, the understanding of the actual stress-transfer mechanisms, and virtual testing. Surrogate analytical models can replace effectively non-linear finite element (FE) computations in parametric studies and identification procedures, reducing execution times and costs without compromising the accuracy of the results. In this context, a frequently used approach consists of the interpolation, by means of radial basis functions (RBFs), of data filtered by proper orthogonal decomposition (POD). This methodology is often used to reproduce the smooth output of different mechanical systems. This work is rather focused on the homogenized response of damaging metal matrix composites subjected to strain localization phenomena, and explores the accuracy achievable in these situations by the POD-RBF approximation of more traditional FE analyses. In all considered cases, the POD-RBF results are accurate, and able to distinguish between apparently similar situations. The approach is flexible, and the performance of the surrogate models can be tailored to the requirements of each application. In particular, various analytical approximations can be introduced to support the design of new microstructures and material couplings, and to understand the role of any material and/or geometry imperfections resulting from the production processes.

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Parametric failure analysis of metal-based composites

Bolzon

Talassi

2023

Procedia Structural Integrity

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The influence of imperfect interfaces on the measurable effective properties of ceramic composites

Cited by 3 publications

References 70 publications

The effect of imperfect bonding on stress distribution in fibrous composites

The effect of imperfect bonding on stress distribution in fibrous composites

Surrogate analytical models of damage localization in metal matrix composites

Parametric failure analysis of metal-based composites

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