多次水下爆炸对船体梁累积毁伤试验研究

Experiments on Cumulative Damage to Hull Girders Subjected to Multiple Underwater Explosions

针对船体梁累积毁伤问题,开展了多次水下爆炸对船体梁的累积毁伤试验,考察了爆炸距离、爆炸次数等参数对累积毁伤的影响规律,基于船体梁挠跨比建立了毁伤等级模型。结果表明:在中远场水下爆炸加载作用下,船体梁不发生塑性变形;在近场作用下,船体梁会产生中部凹陷的局部塑性变形和整体中拱塑性弯曲变形;随着爆炸距离的减小,船体梁整体挠度值增大;在相同工况下船体梁的累积挠度值与爆炸加载次数近似呈线性关系。

For the cumulative damage analysis of hull girders,cumulative damage tests on hull girders subjected to multiple underwater explosions were conducted and the factors affecting cumulative damage were considered,including explosion distance,explosion time,and other parameters.A damage level model for hull girders was established based on the ratio of deflection to the half-length of a hull girder.The results demonstrate that a hull girder does not undergo plastic deformation under the action of medium-and far-field underwater explosion loading.Under the action of near-field explosion loading,a hull girder produces two deformation modes:local plastic deformation of the middle depression and overall plastic bending deformation of the middle arch.With a decrease in the explosion distance,the overall deflection of the hull girder increases.Under the same conditions,the cumulative deflection of a hull girder is approximately linearly correlated with the cumulative loading time of an explosion.