Effect of the silicon-carbide micro- and nanoparticle size on the thermo-elastic and time-dependent creep response of a rotating Al–SiC composite cylinder
| Autor: | Ehsan Loghman, M. Hammami, Abbas Loghman |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Mechanical Engineering Constitutive equation 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics Thermal conduction chemistry.chemical_compound 020303 mechanical engineering & transports 0203 mechanical engineering chemistry Creep Mechanics of Materials Volume fraction Silicon carbide Cylinder Particle Particle size Composite material 0210 nano-technology |
| Zdroj: | Journal of Applied Mechanics and Technical Physics. 58:443-453 |
| ISSN: | 1573-8620 0021-8944 |
| DOI: | 10.1134/s0021894417030099 |
| Popis: | The history of stresses and creep strains of a rotating composite cylinder made of an aluminum matrix reinforced by silicon carbide particles is investigated. The effect of uniformly distributed SiC micro- and nanoparticles on the initial thermo-elastic and time-dependent creep deformation is studied. The material creep behavior is described by Sherby’s constitutive model where the creep parameters are functions of temperature and the particle sizes vary from 50 nm to 45.9 μm. Loading is composed of a temperature field due to outward steady-state heat conduction and an inertia body force due to cylinder rotation. Based on the equilibrium equation and also stress-strain and strain-displacement relations, a constitutive second-order differential equation for displacements with variable and time-dependent coefficients is obtained. By solving this differential equation together with the Prandtl–Reuss relation and the material creep constitutive model, the history of stresses and creep strains is obtained. It is found that the minimum effective stresses are reached in a material reinforced by uniformly distributed SiC particles with the volume fraction of 20% and particle size of 50 nm. It is also found that the effective and tangential stresses increase with time at the inner surface of the composite cylinder; however, their variation at the outer surface is insignificant. |
| Databáze: | OpenAIRE |
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