摘要
为研究舰船结构在遭受导弹等武器攻击下的抗爆能力,取导弹战斗部装药密度、舷侧防护结构材料的弹性模量、切线模量和极限强度作为随机变量;采用对较小数量的样本进行拟合的方法,用随机数生成程序得到50组随机变量的初始值,利用ANSYS/LS-DYNA有限元程序进行仿真计算,得到水下接触爆炸载荷作用下舷侧防护结构各层板的最大等效应力值;验证各层板最大应力值是否服从正态分布,采用W检验得到了各层板应力分布函数,考虑战斗部爆炸点与舷侧防护结构板架加强筋的相对位置关系,采用强度极限准则,利用蒙特卡罗方法模拟得到其破坏概率.该方法所用样本数量少,充分利用了样本信息,效率较高,具有一定实际应用意义.
In order to study the ability of warship structures to resist explosive forces when attacked by missiles and other weapons, the authors took missile warhead density, elastic modulus, tangent modulus and ultimate strength of broadside defensive structures as random variables, applied the fitting method to smaller sized samples, and then obtained initial values for 50 groups of random variables with code that generated random values. Next, using the finite element simulation procedures ANSYS/LS-DYNA and assuming that the maximum values of stress follow a normal distribution, the maximum values of equivalent effective stresses to the plates were derived. Then the stress- distribution functions of the plates were obtained using W-examination. Considering the relative position of stiffeners on the broadside plates and the point of the explosions, ultimate strength criteria were employed to calculate the failure probability of the plates by Monte Carlo simulation. This method, while using a small number of samples, makes full use of sample information, so it has practical applications.
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2009年第5期491-494,588,共5页
Journal of Harbin Engineering University
基金
国家自然科学基金委员会和中国工程物理研究院联合基金项目(10276013)
关键词
水下爆炸载荷
防护结构
加筋板
破坏概率
舷侧
可靠性分析
underwater explosive load
defensive structure
reinforced plate
failure probability
broadsid
reliability analysis
