Numerical Simulation Of Composite Interface Characteristics Of Dissimilar Metal Explosion

With the rapid development of modern science and technology and engineering construction,the demand for metal composite engineering materials is increasing year by year.Among many metal composite materials preparation processes,explosive welding is the most convenient and has the best economic benefits.However,explosive welding is completed in an instant,and the collision interface has a complex physical environment of high temperature,high pressure and high strain.Therefore,there is still a lack of perfect and convenient observation means for the movement state of metal jet,the metallography of composite interface and the bonding parameters,and the initial welding parameters still need to be further optimized.In this paper,through consulting a large number of related literatures at home and abroad,based on the existing theoretical results of explosive welding and numerical simulation calculation method,the two-dimensional explosive welding calculation model of dissimilar metals is established by using AUTODYN commercial software,and the explosive welding process of aluminum alloy(AL6061-T6),titanium alloy(TI6%AL4V),steel alloy(V250),copper(CU-OFHC)and other materials is carried out by combining Lagrange-SPH coupling algorithm(1)the explosive welding process of different metal combinations was simulated,and the jet movement and basic morphology at the interface were observed.the results showed that the movement trend of metal jet coincided with the description of Bahrani engraving mechanism.(2)The correlation between the waveform parameters of the bonding area and the spacing and preset angle of the substrate is analyzed.The results show that the wavelength,wave height and spacing of the bonding area are positively correlated within the range of 5-25mm,and with the increase of the spacing,the melting phenomenon of the bonding interface intensifies,and material gaps and voids appear.In the range of 5-25 preset angle,the wavelength is positively correlated with the preset angle,but the wave height has no obvious correlation.(3)The explosive charge structure in explosive welding process was optimized,and the comparative analysis showed that the interface wave-like bonding was uniform and the average value of parameters was small,and the bonding strength was good,at the same time,the problems of excessive damage at the end of the material and excessive melting at the interface were avoided.(4)The simulation analysis of multi-metal double-layer explosive welding process is carried out.The calculation results show that,in the double-layer explosive welding process,due to the initial difference of delay time,the distance between the base plate and the lower plate,there is a time difference in the penetration of the upper and lower plates into the substrate,which changes the relative movement trend between the substrate and each plate,and leads to the problems of energy dissipation in the upper layer welding and energy redundancy in the lower layer,and then presents different joint interface morphology.Figure[40]table[19]reference[80]...