NIST Contribution to the ASTM E08.07.06 Round Robin on Determining the Master Curve Reference Temperature, T0,X, at Elevated Loading Rates (ILS #1547)
The ASTM Interlaboratory Study (ILS) #1547 (Determining T0,X at Elevated Loading Rates) was launched in 2019 under the leadership of MPA Stuttgart (Germany). The NIST contribution consisted in 80 low-temperature fracture toughness tests at elevated loading rates (dK/dt between 102 MPaVm/s - 103 MPaVm/s). Three different specimen types were used: compact tension with 25 mm thickness, single-edge bend with 20 mm thickness and 40 mm width, and precracked Charpy-type. The materials investigated were Biblis C base and weld materials, and S590QL steel. Test results were analyzed in accordance with ASTM E1921 (Master Curve procedure) for the calculation of the reference temperature T0,X. Some of the tests were performed at actuator displacement rates (30 mm/s-40 mm/s) that turned out to be too high for the frequency bandwidth of the NIST force measuring system. The remaining tests were therefore conducted at a displacement rate lower by an order of magnitude (2.5 mm/s-3 mm/s). For the analysis of the individual tests, a macro-enabled spreadsheet was implemented for performing the calculations in accordance with Annex A14 of the ASTM E1820 standard.
NIST Contribution to the ASTM E08.07.06 Round Robin on Determining the Master Curve Reference Temperature, T0,X, at Elevated Loading Rates (ILS #1547), Technical Note (NIST TN), National Institute of Standards and Technology, Gaithersburg, MD, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=932761
(Accessed September 20, 2021)