The Bimetal Explosive Welding Interface Wave Numerical Simulation By SPH Method

In recent years, explosive welding has become an advanced technology to produce composite panels, It makes use of detonation drive to force different strength, different melting points and different hardness of the material welded together to form a composite material having a plurality of metal performance, which even can unity the non-metallic material and metal material, since the welding process is instantaneous, it generates high strain rate, pressure and temperature changes near the point of the collision. Usually metallographic observation of composites show wavy at the interface which is accompanied by adiabatic shear band, nanocrystalline and amorphous structure, as well as cast microstructure, micro-cracks and other microscopic defects. has been the focus of attention in the field of. Therefore, the study of the interface in the field of explosive welding has become a contemporarily popular topic.Interface combined formation at explosive welding is determining the mechanical properties and performance of composite panels. The study of wavy combined at the explosive welding interface is one of the questions concerned by researchers who engaged in explosion welding. Solving the problem of the weld interface waveform has great theoretical and practical significance and impact on people’s understanding to the mechanism of explosive welding.The study focuses on the metallic materials which is often used on the project, By means of the SPH method in nonlinear finite element software ANSYS/LS-DYNA, The method of numerical simulation for4340steel, OFHC copper,6061-T6aluminum alloy single metal explosive welding has been developed on the basis of adiabatic fluid elastic-plastic model. This forming process of explosive welding interface waves simulation is coincident with Bahrani mechanism, and dimensionless waveform parameters support the rationality of explosive welding "hydro-elasto-plasto-dynamic theory".This article also carried out numerical simulation of explosive welding of bimetal with6061-T6aluminum,3004aluminum, OFHC copper and ARMCO iron under different dimensionless pressure, continuous spray jet mainly comes from aluminum in the explosive welding waveform simulation of Iron and aluminum combination, Wave front whirlpool exists in combination interface, and the interface waveform shows flat and it is difficult to form regularly waveform, which is coincide with the experimental phenomena., Interface appearance is similar to Helmholtz mechanism, Wave length has the tendency of the up and down with increasing external load. Simulation results for copper and iron waveform show that the interface formation. A similar result as the same metal has been get on the change of dimensionless wave length. In conclusion,"Hydro-elasto-plasto-dynamic model" has suitable use for numerical simulation of explosive welding. It can simulate the process of interfacial wave formation of explosive welding bimetals by SPH method, which provides a reference for engineering practice.