Influence of matrix ductility, interfacial bonding strength and fibre volume fraction on tensile strength of unidirectional metal matrix composites

The relationship between point defects and mechanical properties has not been fully understood yet from a theoretical perspective. This study systematically investigated how the Stone–Wales (SW) defect, the single vacancy (SV), and the double vacancy (DV) affect the mechanical properties of graphene/aluminum composites. The interfacial bonding energies containing the SW and DV defects were about twice that of the pristine graphene. Surprisingly, the interfacial bonding energy of the composites with single vacancy was almost four times that of without defect in graphene. These results indicate that point defects enhance the interfacial bonding strength significantly and thus improve the mechanical properties of graphene/aluminum composites, especially the SV defect. The differential charge density elucidates that the formation of strong Al–C covalent bonds at the defects is the most fundamental reason for improving the mechanical properties of graphene/aluminum composites. The theoretical research results show the defective graphene as the reinforcing phase is more promising to be used in the metal matrix composites, which will provide a novel design guideline for graphene reinforced metal matrix composites. Furthermore, the sp3-hybridized C dangling bonds increase the chemical activity of the SV graphene, making it possible for the SV graphene/aluminum composites to be used in the catalysis field.

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Predictive Computational Model for Damage Behavior of Metal-Matrix Composites Emphasizing the Effect of Particle Size and Volume Fraction

Materials ◽

10.3390/ma14092143 ◽

2021 ◽

Vol 14 (9) ◽

pp. 2143

Author(s):

Shaimaa I. Gad ◽

Mohamed A. Attia ◽

Mohamed A. Hassan ◽

Ahmed G. El-Shafei

Keyword(s):

Finite Element ◽

Metal Matrix Composites ◽

Metal Matrix ◽

Volume Fraction ◽

Particulate Composites ◽

Aluminum Matrix Composites ◽

Matrix Composites ◽

Zone Method ◽

Stress Strain ◽

The Matrix

In this paper, an integrated numerical model is proposed to investigate the effects of particulate size and volume fraction on the deformation, damage, and failure behaviors of particulate-reinforced metal matrix composites (PRMMCs). In the framework of a random microstructure-based finite element modelling, the plastic deformation and ductile cracking of the matrix are, respectively, modelled using Johnson–Cook constitutive relation and Johnson–Cook ductile fracture model. The matrix-particle interface decohesion is simulated by employing the surface-based-cohesive zone method, while the particulate fracture is manipulated by the elastic–brittle cracking model, in which the damage evolution criterion depends on the fracture energy cracking criterion. A 2D nonlinear finite element model was developed using ABAQUS/Explicit commercial program for modelling and analyzing damage mechanisms of silicon carbide reinforced aluminum matrix composites. The predicted results have shown a good agreement with the experimental data in the forms of true stress–strain curves and failure shape. Unlike the existing models, the influence of the volume fraction and size of SiC particles on the deformation, damage mechanism, failure consequences, and stress–strain curve of A359/SiC particulate composites is investigated accounting for the different possible modes of failure simultaneously.

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Effect of shoulder diameter to pin diameter (D/d) ratio on tensile strength and ductility of friction stir processed LM25AA-5% SiCp metal matrix composites

Materials & Design (1980-2015) ◽

10.1016/j.matdes.2013.12.008 ◽

2014 ◽

Vol 57 ◽

pp. 1-9 ◽

Cited By ~ 31

Author(s):

P. Vijayavel ◽

V. Balasubramanian ◽

S. Sundaram

Keyword(s):

Tensile Strength ◽

Metal Matrix Composites ◽

Metal Matrix ◽

Matrix Composites ◽

Friction Stir ◽

Shoulder Diameter ◽

Strength And Ductility

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The Mechanical Properties of Steel-Polypropylene Fibre Composites Concrete (HyFRCC)

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.773-774.949 ◽

2015 ◽

Vol 773-774 ◽

pp. 949-953 ◽

Cited By ~ 2

Author(s):

Izni Syahrizal Ibrahim ◽

Wan Amizah Wan Jusoh ◽

Abdul Rahman Mohd Sam ◽

Nur Ain Mustapa ◽

Sk Muiz Sk Abdul Razak

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Compressive Strength ◽

Flexural Strength ◽

Volume Fraction ◽

Concrete Strength ◽

Fibre Volume Fraction ◽

Fibre Volume ◽

Polypropylene Fibre ◽

Experimental Results

This paper discusses the experimental results on the mechanical properties of hybrid fibre reinforced composite concrete (HyFRCC) containing different proportions of steel fibre (SF) and polypropylene fibre (PPF). The mechanical properties include compressive strength, tensile strength, and flexural strength. SF is known to enhance the flexural and tensile strengths, and at the same time is able to resist the formation of macro cracking. Meanwhile, PPF contributes to the tensile strain capacity and compressive strength, and also delay the formation of micro cracks. Hooked-end deformed type SF fibre with 60 mm length and fibrillated virgin type PPF fibre with 19 mm length are used in this study. Meanwhile, the concrete strength is maintained for grade C30. The percentage proportion of SF-PPF fibres are varied in the range of 100-0%, 75-25%, 50-50%, 25-75% and 0-100% of which the total fibre volume fraction (Vf) is fixed at 0.5%. The experimental results reveal that the percentage proportion of SF-PPF fibres with 75-25% produced the maximum performance of flexural strength, tensile strength and flexural toughness. Meanwhile, the percentage proportion of SF-PPF fibres with 100-0% contributes to the improvement of the compressive strength compared to that of plain concrete.

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