INVESTIGATION OF THE PLASTIC DEFORMATION OF A ROTATING DISK FROM AN ALLOY REINFORCED WITH INCOHERENT NANOPARTICLES

An investigation has been conducted into the plastic deformation of a rotating disk from aluminum-based dispersionhardened alloy. The eff ects of the size of strengthening particles on a material′s strength properties have been identifi ed. Simulation results show that the strengthening of a material with nanoparticles change substantially strength characteristics. In alloys with shorter distances between the strengthening particles, a high disk rotation frequency is required for achieving plastic deformation at one and the same volume fraction of particles. With increase in temperature the material plasticizes more, i.e., it becomes more yielding, which is accompanied by a reduction in the material fl ow stress. As a result, a decrease occurs in the rotation frequency at which plastic deformation begins. With increase in the inner and external radii of the disk, at its one and the same width, the disk′s resistance to plastic deformation decreases, and the beginning of plastic deformation occurs at a lower rotation frequency.
An investigation has been conducted into the plastic deformation of a rotating disk from aluminum-based dispersionhardened alloy. The eff ects of the size of strengthening particles on a material′s strength properties have been identifi ed. Simulation results show that the strengthening of a material with nanoparticles change substantially strength characteristics. In alloys with shorter distances between the strengthening particles, a high disk rotation frequency is required for achieving plastic deformation at one and the same volume fraction of particles. With increase in temperature the material plasticizes more, i.e., it becomes more yielding, which is accompanied by a reduction in the material fl ow stress. As a result, a decrease occurs in the rotation frequency at which plastic deformation begins. With increase in the inner and external radii of the disk, at its one and the same width, the disk′s resistance to plastic deformation decreases, and the beginning of plastic deformation occurs at a lower rotation frequency.
Author:  O. V. Matvienko, O. I. Daneyko
Keywords:  dispersion-hardened materials, nanodimensional particles, stress–strain state, strain hardening, plastic deformation, mathematical model
Page:  229