防护装置粘接强度对爆炸切割冲击波的影响

The influence of the bonding strength of the protective device on the shock wave of explosive cutting

为了提升爆炸切割过程中防护装置的防护能力,从防护装置与待防护结构的接触着手,采用胶粘的方式来固定防护装置。利用Ansys/Ls-dyna软件对不同粘接强度的防护装置进行防护仿真,采用TIEBREAK关键字模拟防护装置与有机玻璃板的粘接过程,并设置不同的失效应力来模拟不同粘接剂的粘接情况。结果表明,提高关键字中的失效应力,使得冲击波超压峰值降低了35.2%。但当失效应力达到一定数值后,继续提高失效应力,防护效果提升不明显,冲击波超压峰值最多降低了39.4%。

In order to improve the protective ability of the protective device during the explosive cutting process, starting from the contact between the protective device and the structure to be protected, the protective device is fixed by glue.The Ansys/Ls-dyna software is used to simulate the protection of the protective devices with different bonding strengths. The TIEBREAK keyword is used to simulate the bonding process of the protective device and the plexiglass plate, and different failure stresses are set to simulate the adhesion of different adhesives. Then the situation. The results show that increasing the failure stress in the keyword reduces the peak shock wave overpressure by 35.2%. However, when the failure stress reaches a certain value, the failure stress is continued to increase, the protection effect is not improved significantly, and the peak shock wave overpressure is reduced by 39.4% at most.