中文摘要：

利用基于Hopkinson压杆技术设计的冲击膨胀环实验装置，开展了不同撞击速度下Al2O3陶瓷圆环的冲击拉伸和破碎实验研究．实验结果显示：随撞击速度增大，陶瓷环破碎产生的碎片数目增加，断口分析表明绝大多数的断口都是沿径向断裂，说明陶瓷环的破碎由膨胀环的径向拉伸应力产生；利用实测入射杆和透射杆的应力波形，获得陶瓷环发生破碎的时间和载荷信息，在一定的近似假定下，初步估算陶瓷环的表观动态拉伸强度介于160MPa和250MPa之间，比静态强度130MPa显著提高．

英文摘要：

A new loading fixture was developed to conduct expanding ring tests on a split Hopkinson pressure bar facility. Ceramic rings made of alumina （Al2O3） were dynamically expanded and fragmentized using this test apparatus. Results show an apparent increase of the fragment numbers with the impact velocity. From the stress wave profiles recorded in the output bar, the dynamic tensile strength of the ce- ramic material can be evaluated under simplified assumptions. Preliminary estimates showed that the tested material has a static tensile strength scattered between 125 MPa-135 MPa, and a dynamic tensile strength ranging from ca. 160 MPa to 250 MPa. The apparent tensile strength of alumina increases with the impact velocity,which agrees with the fact that fragment numbers increases with the loading rates.