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Crack analysis of solid rocket motor viscoelastic grains

Author: ZhiShiJun
Tutor: WangZhengShi
School: Nanjing University of Technology and Engineering
Course: Weapons systems and the use of engineering
Keywords: Solid propellant Viscoelastic Structural integrity Crack propagation ABAQUS
CLC: TJ761
Type: Master's thesis
Year: 2009
Downloads: 248
Quote: 1
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Abstract

The solid propellant is an important part of the solid rocket motor . With the continuous improvement of the performance of solid rocket motors , the structure of the solid charge integrity analysis has become an essential part of the design of the solid rocket motor . Solid propellant cracks in engine work , will result in deviation from the design value of the ballistic operating parameters within the engine , not only that , even cause serious engine explosions and other serious accident . ABAQUS software is application , first on the grains in Solidifying conditions of the structure integrity analysis , draw the Grains temperature , stress and strain distributions , on this basis , the ignition shock when the pressure load is applied on grain , the use of dynamic and quasi-static carried draw grain stress and strain distribution . The danger point in the grain at the transition arc , relative to the whole grain , the most prone to damage and the formation of cracks . HTPB sample set further different tilt angles of the initial crack is applied the tensile rate 2mm · min ^{-1 < / sup > a uniaxial tensile load . Crack tip singularity grid processing , maximum energy release rate to calculate the direction of crack propagation . Draw the changing trends Ⅰ crack crack in the expansion process , the greater the angle of inclination of the initial crack , crack propagation , the easier it into a horizontal expansion . The different parts of the cracks in the five-pointed star -shaped grain set the initial crack , calculated at a constant pressure load , the crack propagation angle changes , the crack propagation path and the stress intensity factor and J-integral . The results of this research have important significance for structural integrity analysis of solid propellant , which made ??certain progress in the direction of crack propagation on the finite element calculation , some useful conclusions provide some solid propellant fracture mechanics reference value.}

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