... Comprehensive crack initiation and crack arrest tests were performed, up to neutron fluences far beyond the end of life range, on irradiated original reactor pressure vessel (RPV) steel specimens from German pressurized water reactors (PWR). The neutron fluences applied to the specimen materials...

... Crack arrest is an important concept that can be useful to guarantee the safety of reactor pressure vessels. In case of a pressurized thermal shock, a postulated crack can initiate and arrest due to a decrease in driving force combined with an increase in material toughness due to the thermal...

... A greatly scaled-down version of the wide plate crack arrest test has been developed to characterize the crack arrest performance of a high strength, low alloy (HSLA) steel alloy in the upper region of the ductile-brittle transition. The specimen is a single-edge notched, 152 mm wide by 19 mm...

... A single edge notch tension, SE(T), specimen was used to measure the dynamic fracture toughness and the crack arrest toughness of a tough HSLA steel in the ductile-brittle transition region. The SE(T) specimen was considerably smaller (W = 152 mm) than wide-plate specimens that have been...

... Following an intense period of test methodology development in the late 1970s and early 1980s, crack arrest has received very little attention in the research ommunity. Moreover, the available model for the crack arrest transition behavior of ferritic steel (i.e., the ASME K Ia curve...

... The crack-arrest fracture toughness (K a ) of unirradiated and irradiated specimens machined from a low upper-shelf, high-copper weld was determined. The specimens were machined from the beltline weld of the Midland Unit 1 nuclear reactor pressure vessel (RPV). This weld was fabricated from one...

... measurements on small size specimens were also studied. KEYWORDS: Small specimen, reconstituted specimens, surveillance testing, crack arrest, fracture toughness, electron beam welding. Testing of aging degradation of operating structures (e.g. steam or chemical pipelines, turbine casings etc.) is a difficult...

... toughness requirements to reduce further the risk of failure and modified tank design concepts to alleviate the consequences of failure. It could be argued on safety and economic grounds that the use of crack arrest concepts for storage tanks may be the better option. In the present paper, the comparison...

..., but more efficiently characterize the worst case of a highly constrained crack in a thick pipe. rapid crack propagation polyethylene pipelines crack arrest brittle fracture Charpy test dynamic crack resistance fracture mechanics fatigue (materials) Patrick S. Leevers, I pa#a Yayla, t...

.... fiber-reinforced composite material laminated material fatigue thresholds threshold stress intensity crack growth crack arrest crack closure bridging delamination fiber fracture Stefanie E. Stanzl-Tschegg, 1Maria Papakyriacou, 2 Herwig R. Mayer, 3 Jaap Schijve, 4 and Elmar K. Tschegg 5 High...

... and then used as “lower-bound” estimates. In the NIST wide-plate crack-arrest test program, 16 single edge-notched tension specimens were fractured, using the 26.7 MN universal testing machine. The first series of tests used HSST A533 Grade B Class 1 quenched and tempered steel, while the second series used...

... The objective of this study was to determine the effect of neutron irradiation on the shift and shape of the lower-bound curve to crack-arrest data. Two submerged-arc welds with copper contents of 0.23 and 0.31 wt% were commercially fabricated in 220-mm-thick plate. Crack-arrest specimens...

... Pressure-temperature operating curves for nuclear reactor pressure vessels are based upon a lower-bound fracture toughness curve which bounds rapid load dynamic initiation and crack arrest fracture toughness data. The ASME Boiler and Pressure Vessel Code defines the reference toughness ( K IR...

.... A procedure to measure initiation, propagation, and arrest toughnesses of nuclear pressure vessel steels up to service temperature with CPB specimens is introduced. dynamic fracture toughness crack arrest upper-shelf fracture toughness A533-B steel pressure vessel steel Hervd Couque, ~Robert J...

... This paper demonstrates the applicability of small and simple specimens to measure crack-arrest toughness, K Ia . Specimens used up to now were large or of complicated geometry. Using small instrumented three-point bend specimens of simple geometry, possibilities and limitations were...

... The recently standardized ASTM Test for Determining the Plane-Strain Crack Arrest Fracture Toughness K Ia of Ferritic Steels (E 1221) was modified for use with BIS 690 steel, an Australian low-alloy, 700-MPa strength, quenched and tempered steel used for ship plate. Specimens of 50-mm...

... characterization viewpoint of fracture mechanics may be inadequate under very high rate loading conditions. dynamic fracture dynamic crack propagation elastic-plastic fracture high strain rate fracture crack arrest L. B. Freund I Results on the Influence of Crack-Tip Plasticity During Dynamic Crack...

... associated with a crack arrest phenomenon which could be attributed to the buildup of oxides with time. Over the ranges of R and v used in this investigation, the growth rate behavior at the onset of crack arrest appears to be a combination of time-dependent and cyclic-dependent behavior. Even at 400 Hz...

... The ASTM Crack-Arrest Test, which is under development, is generally limited to providing data up to 20 to 40°C above the ductile-to-brittle transition temperature (expressed as RT NDT in the ASME Boiler and Pressure Vessel Code). For this test, the geometry is a wedgeloaded compact specimen...

... The plane-strain fracture toughness K Ic represents the resistance of a material against crack initiation. The material toughness in the case of a run-arrest event involves a special “material property” called the crack arrest toughness K Ia , which within certain limitations, is a measure...