TY - RPRT TI - Spreadsheet-based software for the analysis of unloading compliance fracture toughness tests in accordance with ASTM E1820 AU - Lucon, Enrico PY - 2022 PB - National Institute of Standards and Technology (U.S.) CY - Gaithersburg, MD SN - NIST IR 8421 DO - 10.6028/NIST.IR.8421 ER -