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为了确定高速撞击条件下压力容器发生具有撕裂的简单穿孔和裂纹失稳扩展的界限 ,实验采用长径比为 0 56的铝柱状弹丸在约 1 7km/s的速度下正撞击铝罐。大部分实验采用的是未防护的铝罐 ,铝罐的压力从 0～ 0 4MPa变化来探索获得不同损伤形式的压力条件。给出了铝罐前、后壁从穿孔到裂纹失稳扩展的实验结果。防护铝罐的主要损伤是其前壁的裂纹失稳扩展。确定了发生裂纹失稳扩展的临界压力 ,并对发生裂纹失稳扩展的临界尺寸进行了分析。
In order to determine the limit of simple perforation and crack instability propagation of pressure vessels under high-speed impact conditions, aluminum column projectiles with an aspect ratio of 0 56 were struck at an aluminum can speed of about 17 km / s. Most of the experiments used unprotected aluminum cans. The pressure of the aluminum cans was varied from 0 to 0 4 MPa to explore the pressure conditions for different forms of damage. The experimental results of the instability propagation from the perforation to the crack front of the aluminum can were given. The main damage of aluminum cans is the crack instability expansion of the front wall. The critical pressure at which the crack instability develops is determined, and the critical dimension of the crack instability propagation is analyzed.