Tests for anti-penetration performance of polygonal steel tube-confined concrete targets
MENG Chaomei 1, 2, SONG Dianyi1, JIANG Zhigang1, LIU Fei1, TAN Qinghua1
1. College of Basic Education, National University of Defense Technology, Changsha 410072, China;
2. School of Aeronautic and Astronautic Engineering, Air Force Engineering University, Xi’an 710038, China
Steel tube-confined concrete (STCC)’s anti-penetration performance is superior to ordinary concrete’s. In order to study effects of steel-tube’s shape on STCC’s anti-penetration performance, tests for 12.7mm hard core bullets with a speed of 600m/s-830m/s penetrating hexagonal, square and circular STCC targets were conducted to detect their failure modes and main damage parameters. The results showed that hexagonal STCC targets’ anti-penetration performance is superior to circular and square STCC targets’; when the steel-containing ratio is 9.75%, the depth of penetration (DOP) of hexagonal STCC targets decreases by 11% compared with circular STCC targets, and the former’s penetration resistance increases by 11%; the failure modes of polygonal (hexagonal and square) STCC targets are different from those of circular STCC targets, the former’s cracks at surface of funnel pits are mainly distributed nearby their diagonals, there are a lots of small cracks at sides of core concrete but no obvious major cracks; polygonal STCC targets’ DOPs increase almost linearly with increase in impact velocity; the impact point eccentricity has little effect on DOP when the ratio of eccentricity is less than 0.35.
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