The analysis of structural fatigue under cyclic temperature loads
A problem has been identified related to deformations of aircraft structures operating in the extreme north and orbital objects in near-earth orbits under conditions of cyclic alternating temperature loads. The formulation of the problem of studying the deformations of materials of structures o...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Omsk State Technical University, Federal State Autonoumos Educational Institution of Higher Education
2021-12-01
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| Series: | Омский научный вестник |
| Subjects: | |
| Online Access: | https://www.omgtu.ru/general_information/media_omgtu/journal_of_omsk_research_journal/files/arhiv/2021/%E2%84%966%20(180)%20(%D0%9E%D0%9D%D0%92)/16-20%20%D0%9B%D0%B5%D1%81%D0%BD%D1%8F%D0%BA%20%D0%98.%20%D0%AE.,%20%D0%A1%D0%BE%D0%BA%D0%BE%D0%BB%D0%BE%D0%B2%D1%81%D0%BA%D0%B8%D0%B9%20%D0%97.%20%D0%9D.,%20%D0%93%D0%B0%D0%B2%D1%80%D0%B8%D0%BB%D0%B5%D0%BD%D0%BA%D0%BE%20%D0%A1.%20%D0%92..pdf |
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| Summary: | A problem has been identified related to deformations
of aircraft structures operating in the extreme north and
orbital objects in near-earth orbits under conditions of
cyclic alternating temperature loads. The formulation of
the problem of studying the deformations of materials
of structures operating under conditions of cyclic
alternating temperature loads using the theories of
cyclic strength, low-cycle fatigue and crack resistance
is presented. It is assumed that at 16 revolutions of
an orbital object around the Earth (the number of
temperature loading cycles n ≥ 1,2105
), cracking occurs
or the size of existing cracks increases to a critical
size from low-cycle fatigue. Linear deformations of the
body material of the International Space Station are
determined, taking into account heating from solar
radiation and cooling, while in the shadow of the
Earth. A hypothesis has been put forward that, under
conditions of cyclic temperature loads, the maximum
effect on the material endurance is exerted by the
calculated ones: the amplitude of the stress cycle, the
maximum stress of the cycle and the range of stress
fluctuations in the cycle, both separately and jointly.
Comparative analysis of the results of calculating the
stresses under cyclic temperature loading according to
3 hypotheses showed that the values of the calculated
stresses are the closest to the maximum cycle stress or
to the cycle stress amplitude. |
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| ISSN: | 1813-8225 2541-7541 |