舰船水下爆炸冲击波载荷作用下动力响应的研究.pdf

大连理工大学硕士学位论文摘要本文针对水面舰船在水下爆炸载荷作用下的响应问题,采用理论分析和数值计算相结合的方法开展研究,主要研究内容与结论如下: (1)介绍了冲击波的形成及其现象,研究了一维、二维爆轰波传播理论。阐述了关于水下爆炸冲击波的基本理论,为舰船结构在非接触水下爆炸载荷作用下的动力响应分析作了必要的准备工作。(2),对水下爆炸冲击波传播的全过程进行数值模拟,计算结果与半理论半经验公式较好的吻合,验证了数值方法的可行性和准确性。讨论了网格密度不同对水下爆炸冲击波计算结果精度的影响。(3)用ALE算法对矩形板进行数值模拟,得到了矩形板在水下爆炸冲击波载荷作用下的响应,并与真实试验进行对比,得到了良好的结果。(4)对舰船在近场水下爆炸载荷下的响应进行了研究。确定了所需材料的本构方程和状态方程,研究了舰船的位移,速度,加速度以及应力响应,并且针对不同冲击因子载荷作用下舰船响应进行研究,得出了有意义的结论,对舰船的抗爆研究及设计具有参考价值。(5)分析了舰船双层底结构在遭受水下非接触爆炸时的响应,从结构能量吸收和结构损伤变形方面进行比较,得出相关结论。本文所给出的结论,对舰船的抗爆研究及设计具有很好的参考价值。关键词:水下爆炸;冲击波;矩形板;动力响应; 舰船水下爆炸冲击波载荷作用下动力响应研究 Study on Response ofShip Structure under Underwater Explosive Impact Loading Abstract Study onresponse ofship structure under underwater explosion Shock on the issues by theoreticalanalysis and main researches and conclusions inthepaDer are asfollows: (1)Introduce theformation andphenomenon ofunderwater explosion shock wave. One-dimensional and models ofblastwave on the basictheory ofshock preparations weremade forthedynamic responseanalysis subjected tothe explosion loading. (2)Utilize non-linear transientdynamical software LS—DYNA tonumerically simulate thewhole propagation ofunderwater shock wave and the calculation results agree withthe empirical formulae very thefeasibilityand accuracy ofthe software and simulation ofdifferentgriddensity and stateequations of detonation subjected toexplosion underwater shock wave arediscussed. (3)Numerical simulations were conducted on therectangular plate using the ALE method ofthe software and thedynamic responses oftherectangular plate subjected totheunderwater shock wave loading pared tothetest,some reliableresultshadbeenachieved. (4)The dynamic responses subjected tounderwater explosion inthenear fieldswere investigated by using LS-DYNA on theconstitutiveequations and state simulations were mad