Detectability of Delaminations in Solid Rocket Motors with Embedded Stress Sensors (Briefing Charts).

摘要

A finite-element-based numerical model is employed to investigate the effect of propellant-insulation delaminations on the radial stress distribution at the bondline during the cooling of a solid rocket motor consisting of propellant, insulation, and casing. With the assumption of stress sensors evenly distributed along the propellant-insulation interface, the way that the debond angles,number of sensors, and sensor accuracy are related is established. Two approaches are proposed to evaluate the detectability of debonds based on the sensor readings. Furthermore, a quantitative mapping obtained between the debond angle and the sensor data is used to inversely estimate the delamination damage. It is demonstrated that the proposed methods can be used to detect delaminations in solid rocket motors.