A Contact Nonlinear Thermo-Structure Fully-Coupled Simulation for Nozzle Based on One-Time Adhesive Failure

Abstract

To simulate a fully-coupled thermo-structure of a nozzle with adhesive failure, a flow field result is obtained based on a grid-independent check. The heat transfer coefficient along the nozzle is gained by Bartz formulation as an initial condition for thermo-structure simulation. A check for interface failure based on the adhesive, GD414, property is done to investigate the failure behavior, also to gain a simplified interface treatment. The gaps are chosen by experience. Then the simulation is carried out. The results show that gaps can release the stress of the interfaces while it can’t affect the whole stress distribution too much. The method is suggested to be used in the future and a more reasonable method is suggested.

Coupled Thermo-Structural Analysis Model of Solid Rocket Motor Nozzle considering the Variation of Friction Coefficient under Operating Conditions

“…These boundaries mainly arise from the internal flow. Previous research has proved that the quasi-one-dimensional isentropic flow analysis can be used to predict the boundary conditions in the thermo-structural simulation for SRM nozzle [20,21]. Therefore, the both boundaries are calculated by quasione-dimensional isentropic flow field, as shown in Figure 3.…”

“…Therefore, the both boundaries are calculated by quasione-dimensional isentropic flow field, as shown in Figure 3. The relationship of temperature, pressure and Mach number at any section along the nozzle axis can be expressed as [20,21]:…”

“…This phenomenon needs to be described by an accurate friction coefficient. It is undeniable that many researchers have attached great importance to the debonding process [17][18][19][20][21][22][23][24][25][26]. However, previous studies mainly adopted the empirical value.…”

Thermo-Structural Response Caused by Structure Gap and Gap Design for Solid Rocket Motor Nozzles

“…Sun et al [32] simulated the fully-coupled thermo-structural response of a nozzle with adhesive failure, and the results showed that treating the interface as contact status could reduce the stress intensity. Goyal et al [33] simplified the traditional 3D method, and found that a 2D model could achieve acceptable results.…”