摘要
为分析某型训练弹发射后的跌落强度,该文采用了基于ANSYS/LS-DYNA的流固耦合方法。通过霍普金森压杆试验系统获取所选材料的非线性本构关系,建立了弹体、水、空气耦合的多物质仿真模型。基于Euler/Lagrange罚函数耦合算法建立约束方程,实现力学参数的传递。对训练弹发射后跌落入水的整个过程进行了数值模拟和仿真分析,得出训练弹在流体冲击载荷下产生的应力应变。计算结果表明:训练弹水平跌落入水瞬间,与流体接触的部位出现微小弹性瘪凹;入水后,应力迅速减小并趋于稳定,弹性变形消失;在训练弹距水面10 m高度自由落体平溅入水的工况下,弹体强度满足要求。该方法同样适用于其它具有大变形和非线性性的流体冲击问题。
To analyze the falling strength of a certain type dummy round after launching,a hydraulic-solid coupling approach is used based on ANSYS/LS-DYNA here.Through the Hopkinson press rod experiment system,the nonlinear constitutive relationships of the chosen materials are obtained.The multi-material simulation model having dummy round,water and air is established.Based on the Euler/Lagrange penalty function coupling algorithm,restriction equations are established,and the mechanical parameter is transferred.Numerical simulation and simulation analysis for the whole process of dummy round falling into water after launching are carried out.The stress-strain responses of the dummy round under fluid impacting load are obtained.The result shows that in the moment that the dummy round dropps into water,the part contacting with the fluid has a little flexibly shrunken concavity.The stress is rapidly decreased and stabilized,and the elastic deformation disappeares when it falls into water.The body strength satisfies the requirements in the operating mode of the dummy round freely falling into water horizontally from the hight of 10 m.The proposed approach is also applicable for other fluid impact problems with large deformation and nonlinearity.
出处
《南京理工大学学报》
EI
CAS
CSCD
北大核心
2010年第3期337-341,共5页
Journal of Nanjing University of Science and Technology
关键词
训练弹
跌落强度
流固耦合
冲击载荷
应力应变
dummy rounds
falling strength
hydraulic-solid coupling
shock loads
stress-strain
