Miniaturized Charpy Specimens for the Indirect Verification of Small-Scale Charpy Machines: Initial Qualification Phase
Small specimen test techniques are becoming more and more popular as the need increases to characterize mechanical properties using the smallest possible amount of material, due to various restrictions on material availability, irradiation and testing space etc. NIST is currently working on the development of reference miniaturized Charpy V-notch (MCVN) specimens for the indirect verification of small-scale impact testing machines. The same materials used for NIST standard verification specimens are being considered, at three energy levels (low, high and super-high). Two specimen types are investigated, denominated KLST and RHS. Several instrumented impact tests on miniaturized KLST and RHS specimens of low, high and super high energy have been performed and analyzed. The variability of MCVN data has been compared to that of full-size Charpy data from the original pilot and production lot testing. Although this can be considered just the preliminary phase of this project, the results indicate that MCVN verification specimens can adequately provide an indirect verification of small-scale instrumented impact testers, both in terms of absorbed energy and maximum force. Additional aspects have also been investigated, such as the influence of shear lip symmetry and specimen full fracture on absorbed energy and the correlation between miniaturized and full-size Charpy data.
Miniaturized Charpy Specimens for the Indirect Verification of Small-Scale Charpy Machines: Initial Qualification Phase, Technical Note (NIST TN), National Institute of Standards and Technology, Gaithersburg, MD, [online], https://doi.org/10.6028/NISTTN.1562-1
(Accessed June 8, 2023)