| In recent years,layered metal composite panels have been widely used in aerospace,petrochemical,Marine,shipbuilding,medical and military engineering due to their significant advantages of high cost performance because they can make full use of the physical and chemical properties and mechanical properties of materials and save the use of a large number of scarce precious metals.Through the method of explosive welding,using explosive explosion work to make the same or dissimilar metal plate in an instant metallurgical combination,so that explosive welding technology is widely used in industrial production.Based on the AUTODYN-2D module in ANSYS platform,Smooth Partical Hydrodynamic algorithm was used to conduct numerical simulation research on the explosive welding of aluminum/lead system and aluminum/titanium/steel system.The simulation results were used to guide the actual explosive welding process parameters and test,and the microstructure and mechanical properties of the metal composite plate obtained after the experiment were studied.The main results are as follows:(1)In the simulation process of explosive welding,the generation and change of jet phenomena and the generation of waveform interface are reproduced.The pressure distribution of ignition point and collision point of explosive is elliptic,decreasing gradually from the center to the periphery.There is a narrow high temperature zone and an effective plastic strain zone at the interface.With the explosion,the pressure,density and velocity of the detonation product,cladding plate and transition layer change correspondingly.The detonation product formed on the upper surface of the explosive presents a free divergence,and the parameter curve presents a "single peak" change.The detonation product,cladding plate and transition layer formed on the lower surface of explosive are blocked by one or both sides,and the parameter curve shows a "double peak" change.The parameter values of starting point and ending point are generally smaller than other values due to the existence of "boundary effect".(2)The aluminum/lead double-layer metal composite plate was prepared by using simulated experimental data.No damage was found on the macro outer surface,and no delamination,bulging and vortex phenomenon at the interface.There are two typical bonding interface regions between aluminum/lead double-layer metal clad plates: melting zone and island zone.There is no intermetallic compound and the thickness of the thermal diffusion layer at the interface is about 3 μm.(3)The aluminum/titanium/steel three-layer metal composite plate was prepared by using simulated experimental data and compared with the aluminum/steel double-layer metal composite plate.The aluminum/steel flat interface changed into the aluminum/titanium interface with sinusoidal waveform and the titanium/steel interface with sawtooth meshing.Vortex melt zone is formed at aluminum/titanium and titanium/steel interface,and brittle intermetallic compounds are difficult to form.The overall mechanical properties of aluminum/titanium/steel three-layer metal composite plate are improved,and the tensile strength is increased from149.88 MPa to 178.22 MPa by 18.9%.The shear strength is increased from75.20 MPa to 95.55 MPa by 27.1%.The hardness of the interface is significantly increased and gradually decreases from the interface to both sides of the matrix. |
