近临界厚度乳化炸药在金属箔焊接中的应用
徐俊峰1,马宏昊1,2,沈兆武1,杨 明1, 黄泽春1,周 恒1

(1.中国科学技术大学 中国科学院材料力学行为和设计重点实验室,安徽 合肥 230026; 2.中国科学技术大学 火灾科学国家重点实验室,安徽 合肥 230026)

爆炸力学; 金属箔; 爆炸焊接; 玻璃微球; 乳化炸药; 临界厚度

Application of Near Critical Thickness Emulsion Explosive in Welding of Metal Foils
XU Jun-feng1, MA Hong-hao1,2,SHEN Zhao-wu1,YANG Ming1,HUANG Ze-chun1,ZHOU Heng1

(1.CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei 230026, China; 2. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, China)

explosion mechanics; metal foil; explosive welding; hollow glass microsphere; emulsion explosive; critical thickness

DOI: 10.14077/j.issn.1007-7812.201907031

备注

为了研究低爆速近临界厚度炸药在金属箔爆炸焊接中的应用,以乳化炸药为例,通过改变其中玻璃微球的含量,探究了玻璃微球含量对乳化炸药临界厚度及近临界爆速的影响; 分别采用含质量分数20%和25%的玻璃微球对应的近临界厚度装药进行了TA2钛箔和Q235钢的爆炸焊接,并分析比较了两组焊接效果。结果 表明,随着乳化炸药中玻璃微球含量的上升,其临界厚度及近临界爆速显著降低,当玻璃微球的质量分数为5%、10%、15%、20%和25%时,临界厚度分别为7.4、6.8、6.2、6.0、5.8 mm,近临界爆速分别为4285、3676、2970、2600、2359m/s; 相比于6.2mm近临界厚度装药,采用6.0mm近临界厚度炸药焊接后得到的复合材料,表面更加平整,边缘无剪切裂纹,结合界面呈现出无缺陷的小波状,拥有更高的结合质量。得出低爆速的近临界厚度炸药适用于金属箔的爆炸焊接。

To study the application of near critical thickness explosives with low detonation velocity in welding of metal foils, taking emulsion explosive for example, the effects of the content of hollow glass microsphere(HGM)on the critical thickness and the near critical detonation velocity of emulsion explosive were investigated. Meanwhile, two groups of near critical thickness charges with the HGM mass fraction of 20% and 25% were applied in the welding of TA2 titanium foil and Q235 steel, and the welding quality were analyzed and compared. The results show that the critical thickness and near critical detonation velocity of emulsion explosives decrease significantly with the increase of the content of hollow glass microsphere. When the mass fraction of hollow glass microspheres are 5%, 10%, 15%, 20% and 25%, the critical thickness are 7.4, 6.8, 6.2, 6.0 and 5.8mm, respectively, and the near critical detonation velocity are 4285, 3676, 2970, 2600 and 2359 m/s, respectively. Compared with the 6.2mm near critical thickness charge, the welding material under 6.0mm near critical thickness charge has a smoother surface without shear cracks at the edges, and flawless wavelet bonding are achieved at the interface, which means higher bonding quality. In conclusion, near critical thickness explosives with low detonation velocity is available for welding of the metal foils.