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Proceedings Paper

Testing of fracture toughness under biaxial loading
Author(s): Milan Brumovsky; Dana Lauerova; Jiri Palyza
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Paper Abstract

Reactor pressure vessels under some special regime (e.g. pressurized thermal shock) are loaded by a strongly biaxial tensile stresses that ratio can reach even an opposite value in comparison with normal operating conditions. Pressure vessel integrity as well as its life assessment is performed on the basis of fracture mechanics where normally only uniaxial fracture toughness of materials are used as material input data. Special biaxial tests on cruciform type specimens with thickness up to 90 mm are tested in our Institute -- special testing equipment and testing methods including measurements have been developed and realized. Testing equipment with maximum loading capacity up to 1.5 MN allows to reach different biaxial loading ratios between 0 and 2. During tests, carried out mostly at low temperatures, specimens deflections, strains, load and crack opening displacement are measured and then evaluated. Biaxial loading results in some decrease in fracture toughness compared with uniaxial test results.

Paper Details

Date Published: 20 March 1997
PDF: 5 pages
Proc. SPIE 2921, International Conference on Experimental Mechanics: Advances and Applications, (20 March 1997); doi: 10.1117/12.269804
Show Author Affiliations
Milan Brumovsky, Nuclear Research Institute (Czech Republic)
Dana Lauerova, Nuclear Research Institute (Czech Republic)
Jiri Palyza, Nuclear Research Institute (Czech Republic)

Published in SPIE Proceedings Vol. 2921:
International Conference on Experimental Mechanics: Advances and Applications
Fook Siong Chau; C. T. Lim, Editor(s)

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