热压工艺参数对侵彻战斗部装药质量影响的数值模拟及试验验证OA

To explore the high-quality and high-safety compaction process of the penetrator warhead charge,a thermomechan-ical coupling finite element method was adopted,and a modified Shima-Oyane constitutive model was established.The com-paction process of a Φ60 mm cylindrical charge was simulated.The action mechanisms of key process parameters such as com-paction pressure,loading rate,temperature,and holding time were analyzed,and the influence laws of these parameters on the quality of the modelingcharge(including relative density and density uniformity)were revealed.The results indicate that the hot-pressing process can effectively improve the quality of penetration warhead charges.Under a pressure range of 200-250MPa,a relative density above 96％can be achieved,while the axial spring-back is reduced by 15％—20％compared to that at 50 ℃.All process parameters have an impact on the final quality of the charge:increasing the compaction pressure alone can improve the density uniformity of the charge and lead to an increase in spring-back;appropriate loading rate and holding time help to improve the density uniformity and reduce the spring-back of the explosive.The optimal conditions for achieving the best forming quality of this penetration warhead charge are as follows:compaction pressure of 200-250MPa,pressing time of 9-12s,temperature of 80-90 ℃,and holding time≥120s.