Determination of the J integral on 1.6770 steel
AbstractAbstract
[en] Dynamic fracture mechanics and notch impact bending tests were carried out for the tank material 1.6770 of the KNK reactor. As far as possible, the tests were done and evaluated based on the J integral Standard E 813. Lacking a functioning method for measuring the length of cracks for fracture mechanics, one had to fall back on the multi-sample method. The 'stop block' method used to produce a defined small extension of cracks at high speeds of loading was described. The process is very expensive and excites great vibration in the samples. If the force and deflection are measured directly on the sample and using a suitable process, it supplies plausible J0.2 and K1d results. Compared to this, the notch impact bending test results evaluated by fracture mechanics methods from Jmax in the transition range gives results about 30 C lower. The explanation of the difference in the results lies in the different procedures: a) Fracture mechanics values J0.2 from crack resistance curves (with energies from defined crack extensions); b) Notch impact energies only determined from the maximum force (associated length of crack cannot be measured). The different sample geometries B/W and the type of loading in the bending devices may be responsible for the remaining difference. (orig.)
Original Title
Dynamische J-Integral-Ermittlung am Stahl 1.6770
Primary Subject
Secondary Subject
Source
Deutscher Verband fuer Materialforschung und -pruefung e.V., Berlin (Germany); 517 p; 1992; p. 145-154; 24. DVM fracture workshop meeting: Fracture characteristics under high stress velocities; 24. Vortragsveranstaltung des DVM-Arbeitskreises Bruchvorgaenge: Bruchvorgaenge unter Hohen Beanspruchungsgeschwindigkeiten; Aachen (Germany); 18-19 Feb 1992; Available from FIZ Karlsruhe
Record Type
Miscellaneous
Literature Type
Conference
Country of publication
Descriptors (DEI)
Descriptors (DEC)
ALLOYS, CARBON ADDITIONS, CHROMIUM ALLOYS, CONTAINERS, ENRICHED URANIUM REACTORS, EXPERIMENTAL REACTORS, HEAT RESISTANT MATERIALS, HEAT RESISTING ALLOYS, HYDRIDE MODERATED REACTORS, IRON ALLOYS, IRON BASE ALLOYS, LIQUID METAL COOLED REACTORS, LOW ALLOY STEELS, MATERIALS, MATERIALS TESTING, MECHANICAL TESTS, MECHANICS, MOLYBDENUM ADDITIONS, NICKEL ADDITIONS, NIOBIUM ADDITIONS, POWER REACTORS, REACTORS, RESEARCH AND TEST REACTORS, SODIUM COOLED REACTORS, STEELS, SZR TYPE REACTORS, TESTING, THERMAL REACTORS
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