An equivalent uniaxial fatigue stress model for analyzing landing gear fuse pins
We study the biaxial stress state conditions in landing gear fuse pins in the fuse groove. This biaxial state comprises a combination of shear stresses which are usually the largest stresses in the fuse pin by design, and compressive stresses which keep the half-section of the fuse pin i...
Збережено в:
Видавець: | Інститут проблем міцності ім. Г.С. Писаренко НАН України |
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Дата: | 2006 |
Автори: | , , |
Формат: | Стаття |
Мова: | English |
Опубліковано: |
Інститут проблем міцності ім. Г.С. Писаренко НАН України
2006
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Назва видання: | Проблемы прочности |
Теми: | |
Онлайн доступ: | http://dspace.nbuv.gov.ua/handle/123456789/47851 |
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Цитувати: | An equivalent uniaxial fatigue stress model for analyzing landing gear fuse pins / K. Narayan, K. Behdinan, P. Vanderpol // Проблемы прочности. — 2006. — № 3. — С. 85-98. — Бібліогр.: 9 назв. — англ. |
Репозиторії
Digital Library of Periodicals of National Academy of Sciences of UkraineРезюме: | We study the biaxial stress state conditions in
landing gear fuse pins in the fuse groove. This
biaxial state comprises a combination of shear
stresses which are usually the largest stresses in
the fuse pin by design, and compressive
stresses which keep the half-section of the fuse
pin in equilibrium. Conventional fatigue analysis
techniques use an equivalent uniaxial stress,
based on the Mises stress of a pure-shear condition.
The respective predicted fatigue damages
are much higher than those obtained from fuse
pin cyclic tests. A new equivalent uniaxial fatigue
stress model is proposed that includes the
additional compressive stress as a relief on the fatigue damage in the fuse groove, thereby explaining
the observations from fuse pin tests.
The model is used in conventional uniaxial
strain-life fatigue software (Goodrich Aerospace’s
Fatigue Life V2) to predict the fatigue
damage on a landing gear fuse pin with a sample
load spectrum. The results are then compared
to the pure shear model, and to a biaxial
FEM fatigue analysis. As compared to the
equivalent Mises model, the proposed model
provides less conservative estimation of the
fuse pin fatigue life, the latter value being
higher than that provided by the two-dimensional
FEM calculation. |
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