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Stress Field Analysis Near Crack Tip Buried in the Rosette Carbon-Carbon Nozzle of SRM

Author: FanJie
Tutor: ZhongWeiFang；LiangYiDe
School: Huazhong University of Science and Technology
Course: Solid Mechanics
Keywords: And other parameters Orthotropic Carbon / carbon nozzle Plane strain Plane crack Finite element method
CLC: V435
Type: Master's thesis
Year: 2005
Downloads: 117
Quote: 2
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Abstract


This article is to participate in the National Space Science and Technology Corporation Fund - petals ply carbon / carbon material solid rocket motor flexible nozzle expansion section near the crack stress field based on completed . The nozzle is one of the key components of a rocket engine . Both in the course of their work , the nozzle under high temperature hot carrier and subjected to gas erosion and a variety of complex mechanical load . Great impact on the expansion of the flexible nozzle petals overlay C / C segment cracks exist , no doubt on the reliability of the nozzle . Based on the requirements of the Fund , the main work is as follows: First , according to the characteristics of the material parameters of the petals ply carbon / carbon material expansion of the flexible nozzle segment , considered parameters orthotropic materials derived its plane cracks the general solution . And obtain the general solution is taken as the the two fractal interpolation function of the finite element method . Secondly , in accordance with the structure and characteristics of the expansion section on the finite element model of the existing nozzle as a whole , to take the expansion segment the small end of the ring to the 48 - turn section as object of analysis , and establish a finite element analysis model . Based on the characteristics of the model data can be exported , combined with fractal finite element and finite element programming, solving the structure and thermal and structural coupling stress intensity factor corresponding to different crack angle . Again using different parameters such as unit interpolation fractal discrete crack tip , the analysis took into account the impact on the interpolation unit type fractal finite element calculation accuracy and convergence speed . Finally, structural loads , the contrast , the crack presence of the stress field near the crack tip . In the presence of cracks in the case , the contrast structural loads and thermal structure coupling crack tip stress field near .

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