复合材料定向管热弹动力响应特性研究  

STUDY ON THERMO-ELASTICITY DYNAMIC RESPONSE CHARACTERISTICS OF COMPOSITE MATERIAL DIRECTION PIPE

作　　者：朱孙科[1] 于存贵[2] 罗天洪[1] 张渝[1] 

机构地区：[1]重庆交通大学机电与汽车工程学院,重庆400074 [2]南京理工大学机械工程学院,南京210094

出　　处：《工程力学》2014年第1期250-256,共7页Engineering Mechanics

基　　金：国家自然科学基金项目(51375519);重庆市教委科学技术研究项目(KJ130403);重庆市自然科学基金项目(cstc2012jjA70001)

摘　　要：为研究复合材料定向管热弹性问题,采用求解轴对称流动Euler方程组的正格式方法对管内火箭燃气射流场进行数值模拟,得到了管内流场热力载荷。运用非线性有限元方法,建立了复合材料定向管非线性热弹性有限元模型,将定向管模态计算结果与模态试验结果作比较,验证了有限元模型的有效性,计算了复合材料定向管分别在火箭燃气动压载荷、非定常温度场和耦合状态下的动力学响应。结果表明:由非定常温度场热冲击引起的定向管内壁面热应力响应呈现脉冲形状,轴向应力对复合材料定向管定位部间管段的应力响应影响较径向应力和周向应力明显,热冲击引起的热应力在复合材料定向管的热弹性应力响应中占主导作用。To study the thermo-elasticity problem of composite material direction pipe, the jet flow-field of rocket gas in direction pipe is simulated numerically using positive scheme, which is developed to solve the axisymmetric Euler equations. The thermal mechanical loads of direction pipe inner surface are obtained. The nonlinear thermo-elasticity model of composite material direction pipe is established by nonlinear finite element method. Comparison between the computation modal and test modal shows that the composite material direction pipe finite element model is effective. The dynamic responses of composite material direction pipe under rocket gas pressure load, unsteady temperature field and the two coupled case are calculated respectively. The results indicate that the thermal stress responses of the inner surface caused by unsteady temperature field thermal shock present a pulse shape. The axial stress has more significant influence on the stress response of direction pipe between the location parts than the radial stress and circumferential stress. The thermal stresses caused by thermal shock have dominant roles in the thermo-elasticity stress responses of the composite material direction pipe.

关 键 词：复合材料 定向管 热弹性 正格式 有限元 

分 类 号：TJ393[兵器科学与技术—火炮、自动武器与弹药工程] TJ013