圆筒内嵌钨合金球爆炸加载条件下断裂机制研究

针对钨合金作为预制破片战斗部穿甲后的易碎性,采用圆筒内嵌钨合金球战斗部,研究了97.5W-Ni-Fe合金在圆筒内嵌式爆炸加载穿靶前后的微观组织以及断裂机制。结果表明,97.5W-Ni-Fe合金爆炸加载后在钨颗粒内部产生大量形变孪晶,穿透靶板后形变孪晶诱发大量微观裂纹,微裂纹在穿靶后的拉应力作用下扩展并与W-W界面断裂相互连接,使钨合金球断裂成有效破片,增强了钨合金的二次毁伤能力。

Fracture Mechanism of Tungsten Alloy Spheres Embedded in Cylinders under Explosive Loading

Considering the brittleness of tungsten alloys as pre-fabricated fragment ammunition after armour-piercing, tungsten alloy spheres embedded in cylinders were employed; the microstructure and fracture mechanism of 97.5W-Ni-Fe alloy were investigated under explosive loading before and after armour-piercing. The results show that high strain rate explosive loading induces a large amount of deformation twins in tungsten particles. The twining deformation after armour-piercing induces lots of micro-cracks and these micro-cracks extend to connect with the W-W interface fracture, becoming macro-cracks due to the tensile stress. As a result, the tungsten alloy spheres are fractured to efficient fragments and the second damage ability is enhanced.