https://www.trl.com/astm_e182_standard_test_method_for_measurement_of_fracture_toughness_planestressplanestrain/
ASTM E1820 - Standard Test Method for Measurement of Fracture Toughness Plane Stress / Plane Strain...
https://www.astm.org/membership-participation/technical-committees/workitems/workitem-wk94015
WK94015 - Revision of E1820-24 Standard Test Method for Measurement of Fracture Toughness | ASTM
ASTM International - Standards Worldwide