多次水下爆炸下背空加筋板损伤累积特性研究

Research on damage accumulation characteristic of air-backed stiffened plate subjected to multiple underwater explosions

为了评估舰船结构在水下多次爆炸冲击下抗爆抗冲击性能,采用Abaqus非线性有限元软件建立了固支背空钢板结构水下爆炸冲击数值模型,数值计算结果与文献实验结果吻合较好,验证了水下爆炸声-固耦合方法的可靠性。在此基础上,提出了多次水下爆炸冲击声-固耦合数值模拟方法,研究了多次水下爆炸冲击下典型背空加筋板损伤累积特性与损伤模式演化规律,分析了冲击因子对结构损伤特性的影响。结果表明,多次水下爆炸冲击作用下背空加筋板动态变形与损伤逐渐累积,可能发生塑性大变形、边界拉伸撕裂以及整体失效破坏等损伤模式演化。当冲击因子小于某一阈值时,背空加筋板多次水下爆炸冲击下塑性变形趋于稳定,出现伪安定现象。研究结果可为舰船结构抗爆抗冲击设计提供参考。

In order to evaluate the anti-explosion performance of ship structures subjected to multiple underwater explosions,a numerical model of typical air-backed structure subjected to underwater explosion is established by using the Abaqus/Explicit software.The numerical calculated results are in good agreement with experimental results in the literature.On this basis,an acoustic-structure coupling numerical simulation modeling method of ship structure subjected to multiple underwater explosions is proposed,and the damage accumulation characteristics of air-backed stiffened plate subjected to multiple underwater explosions are investigated.The damage evolution and accumulation process of stiffened plate is obtained.In addition,the influence of shock factor on damage accumulation is further performed.Results show that with the increase of shock factor,the damage of stiffened plate subjected to multiple underwater explosions accumulates gradually,and the evolution of damage modes such as local deformation stage,boundary tear damage stage and structure integral failure may occur.The plastic deformation of air-backed stiffened plate subjected to multiple underwater explosions tend to a stable value and pseudo shakedown phenomenon occurs when the impact factor is less than a shock factor threshold.The research results can provide a reference for anti-blast and anti-impact design of typical air-backed ship structures.