Enhanced stress concentration sensitivity of SiCp/Al composite with network architecture

Abstract

For network architecture design, stress concentration sensitivity caused by particle shape may change, which is rarely studied. Here, the particle shape dependent stress concentration and its effect on the deformation, fracture and mechanical properties were investigated. Three particle shapes including hexahedron, twenty-six face polyhedron and sphere were utilized to generate different stress distribution states in the matrix. A numerical composite model showing network architecture (like grain boundary) was applied. A strong correlation between particle shape, stress concentration factor (RSiC) and mechanical properties of network composite was built. The particle shape affected the load-bearing capability due to the stress concentration state generated at particle edges. Near the yield point, hexahedron particle wall parallel to the load direction (PaW) was more effective in carrying loads (~1000 MPa) than that of twenty-six face polyhedron (750-1000 MPa) and sphere (600-1000 MPa) particles. In network composites reinforced by different shape particles, the main crack always initiated in perpendicular network walls (PeW), but propagated along different paths: in Al matrix for hexahedron particle, along macro-interface of SiC/Al–Al for twenty-six face polyhedron particle and in PeW for sphere particle. Such crack propagation manners contributed to the different elongations of network composites by various particle shapes: sphere > twenty-six face polyhedron > hexahedron particles. Selection of round particle and adjustment of local volume fraction improved elongation with a sacrifice of modulus and strength.

A modified artificial neural network to predict the tribological properties of Al-SiC nanocomposites fabricated by accumulative roll bonding process

“…18 As a result, the lack of wear resistance of the component results in failure and significant damage, depreciating the composite. 19,20 Using hard particles that are evenly distributed in the matrix, which increases wear resistance, is one of the typical methods for preventing wear in Al-MMCs. 18,19,21,22…”

“…19,20 Using hard particles that are evenly distributed in the matrix, which increases wear resistance, is one of the typical methods for preventing wear in Al-MMCs. 18,19,21,22…”

“…18 As a result, the lack of wear resistance of the component results in failure and significant damage, depreciating the composite. 19,20 Using hard particles that are evenly distributed in the matrix, which increases wear resistance, is one of the typical methods for preventing wear in Al-MMCs. 18,19,21,22 Carbides, such as tungsten carbide (WC), 23,24 titanium carbide (TiC), 25,26 silicon carbide (SiC), [27][28][29] and boride carbide (B 4 C), 30 are among the materials that are frequently employed to improve the wear resistance of MMCs.…”

“…19,20 Using hard particles that are evenly distributed in the matrix, which increases wear resistance, is one of the typical methods for preventing wear in Al-MMCs. 18,19,21,22 Carbides, such as tungsten carbide (WC), 23,24 titanium carbide (TiC), 25,26 silicon carbide (SiC), [27][28][29] and boride carbide (B 4 C), 30 are among the materials that are frequently employed to improve the wear resistance of MMCs. One of the most popular carbides utilized by researchers to improve the wear resistance of aluminum is SiC.…”

The Optimum Design of Particulate in Composite Sheets Using Finite Element Method

“…In 2022, the impact of particle geometry in the mechanical properties was numerical investigated, they used three different types of particle shapes. They found that the sphere particles reinforcing composite had improved the mechanical properties of composite materials [5].…”