Tensile strength of the brittle materials, probabilistic or deterministic approach?
For various loading rates we estimated the activated defect localization in Modified Brazilian Disk (MBD) type glass specimens in comparison with standard spherical glass specimens. Specimen geometry can considerably affect the mechanical response of material, especially brittle ones, which are...
Збережено в:
| Дата: | 2006 |
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| 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/123456789/47783 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Tensile strength of the brittle materials, probabilistic or deterministic approach? / J. Jeong, H. Adib-Ramezani, G. Pluvinage // Проблемы прочности. — 2006. — № 1. — С. 100-115. — Бібліогр.: 17 назв. — англ. |
Репозитарії
Digital Library of Periodicals of National Academy of Sciences of Ukraine| Резюме: | For various loading rates we estimated the activated
defect localization in Modified Brazilian Disk (MBD) type glass specimens in comparison
with standard spherical glass specimens.
Specimen geometry can considerably affect the
mechanical response of material, especially brittle
ones, which are very sensitive to the distribution
of defects. High and low loading rates of
MBD lead glass specimens have been investigated
using universal Instron test machine and
compressive Hopkinson pressure bars. The experimental
results obtained have been compared
using the Weibull distribution for scatter
strength variation. Stress distribution in the
above specimens was calculated using the finite
element method, which provided detailed
analysis of the macromechanical brittle fracture
mechanism. In static tests of spherical glass
specimens, we observed generation of contact
stresses, which result in activation of defects in
the working parts of specimens, whereas no activated
defects were observed in MBD specimens
neither under static, nor under dynamic
loading conditions. For specimens of various
geometries and type of load application it is recommended
to apply probabilistic approaches,
e.g., Weibull’s approach, insofar as contact
stresses in brittle materials induce activation of
defects, location of which depends on the
specimen geometry and loading type. |
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