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

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.