SMOOTHED PARTICLE HYDRODYNAMICS METHOD USED FOR NUMERICAL SIMULATION OF IMPACT BETWEEN AN ALUMINUM PARTICLE AND A TITANIUM TARGET

A method and a program are developed for numerical calculation by the smoothed particle hydrodynamics method of the deformation of an elastoplastic material in the axisymmetric case in the presence of contact boundaries and thermal conductivity of materials. This program is applied to solve a problem of impact of an aluminum particle with a titanium plate under conditions of cold gas-dynamic spraying. It is shown that the impact is accompanied by the strong heating of an aluminum particle up to a temperature of the order of 400 degrees C in the vicinity of the particle-target contact boundary. The calculated temperature is much lower than the melting point of aluminum. An explanation is proposed for the mechanism of the formation of a chemical bond between an aluminum particle and a titanium plate under conditions of cold gas-dynamic spraying due to the formation of an intermetallic compound in a hot layer near the contact boundary because of self-propagating high-temperature synthesis.