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The Unhomogeneity of Temperature Considered on Structural Integrity Analysis on of Solid Rocket Motor Grain

Author: LiHe
Tutor: ZhouJianPing
School: National University of Defense Science and Technology
Course: Aeronautical and Astronautical Science and Technology
Keywords: Solid rocket motor Solidifying Low temperature ignition emission Structural integrity Viscoelastic Finite Element Method Non - uniform temperature field
CLC: V435
Type: Master's thesis
Year: 2008
Downloads: 140
Quote: 0
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Abstract


In the assessment of the structural integrity of the solid rocket motor, the traditional method is that the temperature field is reduced to a uniform temperature field, and is rarely associated with the non-uniformity of the temperature field. Inhomogeneity of the temperature field in the actual work process is likely to have an important impact on motor grain structure integrity. In this paper, three-dimensional finite element model of a particular model of solid rocket motor, give full consideration to the impact of the non-uniform temperature field in the simulation of the cooling process after curing, fired ignition boundary conditions on the basis of the low temperature test as well as low temperature, the engine ignition in the cooling process after curing and low temperature emission The structural integrity was analyzed. The main contents are as follows: the analysis of the structural integrity of the solid rocket motor concept and research progress. Elaborated the concept of solid rocket motor in the cooling process after curing and low temperature test temperature field analysis, discusses the temperature load on the structural integrity. Brief description of the MSC.Nastran software platform in the thermal analysis and structural analysis capabilities. Linear viscoelastic theory, model, constitutive relations and Burgers model-based incremental finite element method. The derivation of the finite element method for heat conduction problems, and gives the mathematical description of the heat conduction problem and its boundary conditions. Steady-state heat conduction and transient heat conduction finite element governing equations were derived, and its solving method. Solid the engine cured cooling uniform temperature field structure integrity analysis. Introduced the the motor grain damage and the structural integrity of the assessment criteria. The finite element model of a particular model of solid rocket motor to explore different engine components, material properties and loading methods, and the structural integrity of the analysis carried out in a uniform temperature field. Solid the engine cured cooling of non-uniform temperature field structure integrity analysis. Boundary conditions given non-uniform temperature field analysis based on non-uniform temperature field of the natural cool-down program, and different time temperature field of solid rocket motor structural integrity assessment. On this basis, the uniform temperature field analysis results were compared and analyzed. Integrity analysis of the structure of the non-uniform temperature field in the solid engine under low temperature conditions. First calculated from Solidifying to a subcooled state, the start of non-uniform temperature field, then cryogenically cooled to different moments engine structural integrity of the structural integrity analysis, focusing rated structural integrity when fired ignition. Short, the temperature inhomogeneities on the structural integrity of the grain analysis, made some progress in the study of non-uniform temperature field. The obtained results and methods of research can provide a reference for the engine production, design and user departments.

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CLC: > Aviation, aerospace > Aerospace ( Astronauts ) > Propulsion system ( engine, propeller ) > Solid propellant rocket motor
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