Numerical Simulation Of Parameter Optimization 1Cr18Ni9Ti / Q235 Explosion Welding

Production parameters in explosive welding are usually based onexperience, the impact of process parameters is not clear,which seriously affectsthe mass production of high quality. Actual explosion welding experiment has acertain risk, and only gets part of the test datas, however simulation of explosivewelding has its advantages of vision and repeatability.We simulate explosive welding progress of1Cr18Ni9Ti/Q235byansys/ls-dyna, studying explosion mechanism of the composite and theparameters impacted on explosion welding process.In numerical simulation, the explosive detonation spreading around theplate by the form of concentric circles centered on explosive tipping point canexplain plates combined with micro wave interface; Pressure increasing alongthe direction of detonation wave can explain combined interface with first smallripple and then big ripple phenomenon at the same thick medicine. when theflyer thickness and dynamite remain the same, the maximum speed andmaximum plastic strain of the flyer element first increase and then decrease withthe increase of spacing, which proves that flyer first accelerates and thendecelerates; h0=0.6cm is the best spacing when the plate thickness is0.5cmand the explosive thickness is3cm,which is the same with the optimumspacing h0=0.5~0.7cm calculated through theoretical calculation. When theplate thickness and spacing remain the same, the maximum speed and maximumplastic strain of the plate element increases with the increase of amount ofexplosive, and determine δ=3cm is the best explosive thickness when the platethickness is0.5cm and the spacing is0.6cm，which is the same with the bestoptimum explosive thickness δ=3cm calculated through theoretical calculation.The unstable load at detonated explosives in the explosion lasts a longer timeunder center-point detonation; Two extreme values of effective plastic strain isbigger under center-point detonation than under side-midpoint detonation, showsthat the explosive utilization rate is higher under center-point detonation than under side-midpoint detonation.Phenomenons in explosive welding stimulation by ansys/ls-dyna softwareis consistent with the actual process, and simulation results are basicallyidentical with the theoretical calculation results,which proves that numericalsimulation is reliable and the numerical simulation is a powerful tool ofresearching welding process and ascertaining welding parameters.