Impact Toughness Modification of NIST Low-Energy Charpy Verification Specimens for Testing at Room Temperature
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چکیده
منابع مشابه
Impact Toughness Modification of NIST Low-Energy Charpy Verification Specimens for Testing at Room Temperature
The possibility for the National Institute for Standards and Technology (NIST) to certify Charpy reference specimens for testing at room temperature (21 °C ± 1 °C) instead of −40 °C was investigated in a previous study, in which a slightly increased likelihood of specimen jamming was observed at the low-energy level (13 J to 20 J). Moreover, there is a concern that the higher impact toughness o...
متن کاملCertification of NIST Room Temperature Low-Energy and High-Energy Charpy Verification Specimens.
The possibility for NIST to certify Charpy reference specimens for testing at room temperature (21 °C ± 1 °C) instead of -40 °C was investigated by performing 130 room-temperature tests from five low-energy and four high-energy lots of steel on the three master Charpy machines located in Boulder, CO. The statistical analyses performed show that in most cases the variability of results (i.e., th...
متن کاملA NOVEL PROCEDURE FOR MEASURING THE IMPACT FRACTURE TOUGHNESS KId WITH PRECRACKED CHARPY SPECIMENS
A procedure i s presented f o r determining the impact f r a c t u r e toughness K w i t h precracked Charpy specimens wi thout performing any load measurements.'?he Kid-val ue i s obtained from preestabl ished impact response curves and a measurement o f t h e t ime-to-fracture. The measuring technique i s f u l l y dynamic and does not impose any r e s t r i c t i o n s on t h e t e s t condi...
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This report presents the results obtained by the five U.S. participating laboratories in the Versailles Advanced Materials and Standards (VAMAS) round-robin for fracture toughness of advanced ceramics. Three test methods were used: indentation fracture, indentation strength, and single-edge pre-cracked beam. Two materials were tested: a gas-pressure sintered silicon nitride and a zirconia tough...
متن کاملLocal Approach of the Charpy Test at Low Temperature
Charpy V-notch impact testing is widely used in the toughness assessment of large forged components, e.g. the pressure vessel for pressurised water reactors m). At low temperature, A508 C1.3 nuclear pressure vessel steel fails by cleavage fracture. The results reported here are part of both an experimental program and numerical investigations which aim at the establishment of a non-empirical re...
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ژورنال
عنوان ژورنال: Journal of Research of the National Institute of Standards and Technology
سال: 2017
ISSN: 2165-7254
DOI: 10.6028/jres.122.023