Thermal Response of Explosive Charge Cutted by Multi-pulse Femtosecond Laser
In order to analyze the safety of multi-pulse femtosecond laser cutting of explosive charge,a two-dimensional numerical calculation model is established for the numerical calculation of femtosecond laser cutting HMX,TATB,RDX and TNT charges.The thermal response rules of explosive charge under different processing conditions were obtained through experiment.The results show that all the four kinds of explosives above are not ignited when the moving speed of laser spot is 80-300 mm/min.The slower moving speed of reactive spot led to the more obvious heat accumulation effect.The heat accumulation effect of HMX is the most obvious in the dynamic analysis area as compared with those of other three kinds of explosives.When the repetition frequency and energy of femtosecond laser are in the range of 0.1-200 kHz and 50-200 μJ/pulse,respectively,the cutting rate increases first and then decreases by increasing the repetition frequency and energy of femtosecond laser.In addition,cutting rate and safety of femtosecond laser on explosive charge are affected by the performance parameters of explosive.Cutting rate is positively correlated with the laser absorption coefficient of explosive while cutting safety is negatively correlated with the thermal sensitivity of explosive.
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