Numerical Simulation And Experimental Analysis Of Explosive Welding Of Mg/Al Composite Plate

The process of explosive welding is relatively simple,but the explosive welding process is transient,irreversible and dangerous.The process parameters of explosive welding are mainly calculated by empirical formulas and corrected by experienced personnel.However,it is necessary to continuously test the optimum process parameters.As a result,the cycle becomes longer and the material is wasted,so the value can be passed first.The simulation method is used to determine the more reasonable process parameters,and then the test is verified to determine a set of better process parameters.Firstly,this paper used ANSYS/LS-DYNA to numerically simulate the explosive welding process of magnesium-aluminum composite panels.The calculated process parameters were calculated according to the empirical formula.The numerical simulation was carried out with the thickness of the cloth being 2.5 cm and the spacing being 0.5 cm.The displacement,velocity,pressure,plastic strain and equivalent stress of the superstrate were analyzed.The farther away from the starting point,the greater the pressure and speed of the superstrate.Secondly,the influence of the process parameters of different explosive welding on the bonding quality is studied.When the distance between the cladding and the substrate is fixed,the thickness of the coating is different,and the results of the displacement,velocity and plastic strain of the cladding are compared.The results show that when the thickness of the cloth is 2.0cm,the plastic strain of the superstrate is the largest,and the quality of the superposition of the superstrate and the substrate is good.When the thickness of the coating is constant,the simulation is carried out under the condition that the spacing between the superstrate and the substrate is different.The results of displacement,velocity and plastic strain were compared and analyzed.It was found that the plastic strain of the superstrate increased first and then decreased with the increase of the spacing.When the distance between the superstrate and the substrate was 0.3cm,the plastic strain of the superstrate was the largest.The composite board and the substrate are combined in good quality.Finally,three different sets of process parameters were selected for the explosive welding test.The microstructures of the composite plates obtained from the three sets of tests were observed by microstructure and mechanical properties.The results showed that the interface was corrugated.In the three groups,the III group The quality of the composite panel is relatively good,which is consistent with the results of the numerical simulation.