背板对氧化铝陶瓷薄板断裂锥形态的影响

采用弹道侵彻试验与有限元数值模拟相结合的方法，研究了背板条件对氧化铝薄板陶瓷/金属复合装甲在抗12.7 mm穿燃弹过程中形成的陶瓷锥角大小与形态的影响，并分析了陶瓷锥形成的过程与机理.结果表明:背板厚度对于陶瓷锥大小的影响尤为明显，当背板厚度增大时，主裂纹汇聚的交点越靠近弹靶接触面，此时拉剪裂纹的扩展起到了主要作用，当背板厚度与陶瓷厚度之比小于1时，厚度比每增大1/6，陶瓷锥锥角大小增加5%；当界面间波阻抗差值减小即背板材料波阻抗升高时，从界面反射的应力波减弱，从而减小了对陶瓷的损伤，陶瓷断裂锥锥角大小也随之减小. 

Effect of Backing Plate Condition on Fracture Cone Shape ofAlumina Ceramic Thin Tiles

The influence of backplane conditions on the size and shape of ceramic cone angle formed in alumina ceramic/metal composite armor during the 12.7 mm penetration resistance was studied by means of ballistic penetration test and finite element numerical simulation, and the formation process and mechanism of ceramic cone were analyzed. The results show that the effect of back thickness is particularly obvious on the size of the ceramic cone. When the back thickness increases, the intersection of main cracks is near the target interface, here the tensile shear crack expansion plays a major role. When the thickness ratio of the back to ceramic thickness is less than 1, every 1/6 increase of the thickness ratio can cause 5% size increase of ceramic cone angle. When the interfacial wave impedance difference decreases, that is, when the back plate material wave impedance increases, the stress wave reflected from the interface weakens, thus reducing the damage to ceramics, and the ceramic fracture cone angle also decreases.