摘要
计及船体外板的材料强度,基于SPH算法建立水下接触爆炸数值模型,提出混合密度、广义光滑长度等解决数值模拟中计算崩溃的问题,对舰船的水下接触爆炸进行数值模拟,计算结果和冲击波基本理论及接触爆炸试验吻合良好.结果表明,接触爆炸时钢结构会产生圆形冲塞破口,其破口大小和炸药的厚度接近,当板与炸药的正则化厚度达1.8时,板仅会发生较大的塑性变形而不会冲塞破坏.并得到钢的反射系数约为1.2,及接触爆炸钢板的近似变形公式.
Considering material strength of the outside plate of a ship,a numerical model of underwater contact explosion is built based on SPH method.Mixed density and generalized smooth length are put forward to overcome calculation breakdown in numerical simulations.Underwater contact explosion of ships is simulated,and calculation results agree well with shock wave theory and contact explosion tests.It shows that a circular extrusion crevasse,whose size is close to the thickness of the explosive,forms on the steel structure in contact explosion.As regularizing thickness of the steel plate and the explosive reaches 1.8,only plastic deformation occurs on the plate.Reflection coefficient of the steel,which equals about 1.2,and approximate deformation formulas are obtaind.
出处
《计算物理》
EI
CSCD
北大核心
2010年第6期840-846,共7页
Chinese Journal of Computational Physics
基金
国家自然科学基金重点项目(50939002)
国家自然科学基金(10976008)资助项目
青年科学基金(50809018)
关键词
接触爆炸
材料强度
混合密度
SPH
contact explosion
materials strength
mixed density
SPH
