1.School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology;2.Sichuan Aerospace Chuannan Initiating Explosive Technology Limited
为研究舱体边界约束及分离面宽度对铅切割索分离性能的影响，采用数值模拟及试验验证相结合的方法，对铅切割索爆炸后射流分离靶板的影响因素进行分析，得到了自由边界约束、固定边界约束和分离面削弱槽宽度对铅切割索分离性能的影响规律。结果表明，铅切割索分离铸铝等脆性材料是切割索射流侵彻和高压爆轰产物共同作用结果，边界约束对射流侵彻的影响较小，固定边界约束和自由边界约束对相同切割索射流侵彻深度的偏差小于5%；不同的边界约束对靶板的崩裂过程影响较大，固定边界约束会在切割索分离时限制材料的形变位移，进而限制高压爆轰产物对铸铝等脆性材料的崩裂作用，导致后续分离难度加大。增加分离界面削弱槽宽度，可有效降低分离装置边界约束对切割索分离性能的影响，提高切割索的分离可靠性，当削弱槽宽度≥ 12 mm时，2.7 g?m-1铅切割索能够可靠分离4.5 mm厚的ZL114A材料。
In order to study the effect of boundary constraint and separation surface width on separation performance of lead linear shaped charge, numerical simulation and experimental verification were used to analyze the factors affecting the separation of cast aluminum target plate after the explosion of lead linear shaped charge. The effects of free boundary constraint, fixed boundary constraint and slot width of separation surface on separation performance of lead linear shaped charge were obtained. Results show that the separation of brittle materials such as cast aluminum from lead linear shaped charge is the result of the joint action of jet penetration and high pressure detonation products. The boundary constraint has little influence on jet penetration and the deviation is generally less than 5%, but it has a great influence on the cracking process of the target plate. The strong fixed boundary constraint will limit the deformation and displacement of the material during the separation of the cutting cable, and then limit the cracking effect of high-pressure detonation products on brittle materials such as cast aluminum, which will increase the difficulty of subsequent separation. By appropriately increasing the width of the separation interface, the effect of boundary constraints on the separation performance of the cutting cable can be effectively reduced, and the separation reliability of the cutting cable can be improved. The 2.7g?m-1 lead linear shaped charge can reliably separate the ZL114A material with a thickness of 4.5 mm when the width of the weakening groove is ≥12 mm.
先明春,张月萍,李柠芮,等. 边界约束及分离面宽度对铅切割索分离性能的影响[J]. 含能材料,.复制