Interface damage of SiC/Ti metal matrix composites subjected to combined thermal and axial shear loading

A three-dimensional micromechanics-based analytical model is presented to investigate the effects of initiation and propagation of interface damage on the elastoplastic behaviour of unidirectional SiC-Ti metal matrix composites (MMCs) subjected to off-axis loading. Temperature-dependent properties are considered for the matrix. Manufacturing process thermal residual stress (RS) is also included in the model. The selected representative volume element consists of r × c unit cells in which a quarter of the fibre is surrounded by matrix subcells. The constant compliance interface model is used to model interfacial debonding and the successive approximation method together with von Mises yield criterion is used to obtain elastoplastic behaviour. Dominance mode of damage including fibre fracture, interfacial debonding, and matrix yielding and ultimate tensile strength of the SiC-Ti MMC are predicted for various loading directions. The effects of thermal RS and fibre volume fraction on the stress-strain response of the SiC-Ti MMC are studied. Results revealed that for more realistic predictions, both interface damage and thermal RS effects should be considered in the analysis. The contribution of interfacial debonding and thermal RS in the overall behaviour of the material is also investigated. Comparison between results of the presented model shows very good agreement with the finite-element micromechanical analysis and experiment for various off-axis angles.

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“…For the presented SiC-Ti system, R t = R n = 10 −4 MPa −1 as reported in reference [26] and σ DB = 300 MPa [24] are used.…”

Section: Interfacial Debonding Criterionmentioning

confidence: 99%

The effects of interfacial debonding on the elastoplastic response of unidirectional silicon carbide—titanium composites

Mahmoodi

Aghdam

Shakeri

2010

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…So it becomes the hot research issue of materials science and mechanics, multi-particles primitive cell method. [8][9][10][11][12] shows a new developed method to predict the mechanical properties of composites in recent years, and the method is more effective than other methods to research the effect of microstructure, particles size, volume fraction, distribution of particles and etc on the mechanical behavior of PRMMCs. In this method, the microstructure of composite has been reconstructed on the base of composite microstructure characteristic firstly, then the numerical model of reconstructed microstructure has been generated for predicting the properties of composites, the mechanical properties of composites has been obtained by numerical analysis based on the above numerical model.…”

Section: Introductionmentioning

confidence: 99%

Feature extraction and reconstruction of particles reinforced metal matrix composite microstructure

Sun

Song

2009

Proceedings of the 2nd International Conference on Interaction Sciences: Information Technology, Culture and Human

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The issue on mechanical properties of ceramic particles reinforced metal matrix composite is a key to design and application, and multi-particles primitive cell method is an effective method to predict its mechanical properties. The construction method of primitive cell is discussed and studied in this paper. Firstly, the 256 bit gray process of composite's SEM image has been done, and the gray scale threshold of different material phase in composite's image is determined by gray scale histogram; secondly, the boundary of image with a single color and single material phase has been identified by canny edge detector, and the features of composite's microstructure have been extracted according to results of boundary identification; lastly, the numerical primitive cell has been constructed according to these characteristic parameters. The numerical experiment results indicate the proposed construction method of primitive cell is valid and practicable.

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“…Modeling of stresses, defects, and, in consequence, damage of particle-reinforced composite materials induced by thermal loadings have been widely investigated, cf. [ 8 , 9 , 10 , 11 , 12 ]. Various approaches have been used in modeling of these phenomena.…”

Section: Introductionmentioning

confidence: 99%

Discrete Element Framework for Determination of Sintering and Postsintering Residual Stresses of Particle Reinforced Composites

2020

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In this paper, the discrete element method framework is employed to determine and analyze the stresses induced during and after the powder metallurgy process of particle-reinforced composite. Applied mechanical loading and the differences in the thermal expansion coefficients of metal/intermetallic matrix and ceramic reinforcing particles during cooling produce the complex state of stresses in and between the particles, leading to the occurrence of material defects, such as cracks, and in consequence the composite degradation. Therefore, the viscoelastic model of pressure-assisted sintering of a two-phase powder mixture is applied in order to study the stress field of particle assembly of intermetallic-ceramic composite NiAl/Al2O3. The stress evaluation is performed at two levels: macroscopic and microscopic. Macroscopic averaged stress is determined using the homogenization method using the representative volume element. Microscopic stresses are calculated both in the body of particles and in the contact interface (necks) between particles. Obtained results are in line with the cooling mechanism of the two-phase materials.

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Interface damage of SiC/Ti metal matrix composites subjected to combined thermal and axial shear loading

Cited by 18 publications

References 21 publications

The effects of interfacial debonding on the elastoplastic response of unidirectional silicon carbide—titanium composites

The effects of interfacial debonding on the elastoplastic response of unidirectional silicon carbide—titanium composites

Feature extraction and reconstruction of particles reinforced metal matrix composite microstructure

Discrete Element Framework for Determination of Sintering and Postsintering Residual Stresses of Particle Reinforced Composites

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