Volume 36, Number 6, December 2018
|Page(s)||1162 - 1167|
|Published online||12 March 2019|
Experiments on High Temperature Mechanical Properties and Stress Distribution Laws on Strain Isolation Pad
Key Laboratory of Fundamental Science for National Defense-Advanced Design Technology of Flight Vehicle, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
2 AVIC Chengdu Aircraft Design and Research Institute, Chengdu 610091, China
3 State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
The tile is the main heat insulation part of a thermal protection system, and is attached to the outer surface of an orbiter through a strain isolation pad (SIP). In order to study its high temperature mechanical properties and stress distribution, experiments on flatwise tension, flatwise compression and flatwise shear are conducted in the environments of the room temperature of 23±2℃ and the 300℃ high temperature. The load-displacement curve, elasticity modulus and failure strain of the SIP are measured and calculated. Compared with the experimental results under the room temperature, the tension, compression and shear elasticity modulus of the SIP in the 300℃ high temperature environment fall by 9.68%, 9.24% and 8.73% respectively, and the tension and shear failure strain of the SIP in the 300℃ high temperature environment fall by 11.59% and 12.81% respectively. So, the high temperature causes the decrease of the stiffness and strength of the SIP. Its stress distribution is studied with the experimental results. Under the influence of tension, compression and shear force, the stress distribution of the SIP shows trends of low middle and high edge. Besides, shear stress and normal stress are produced under shear force, and the normal stress is tensile at one side and compressed at the other side. The above analysis shows that the edge of the SIP is high in stress and easy to damage.
Key words: thermal protection system / strain isolation pad / high temperature mechanical properties / stress distribution
关键字 : 热防护系统 / 应变隔离垫 / 高温力学性能 / 应力分布
© 2018 Journal of Northwestern Polytechnical University. All rights reserved.
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