Fracture Mechanics: KI limit tests at constant displacement

Modified Bolt-Load Compact Test samples are eventually pre-charged in gaseous hydrogen environment (T = RT ÷ 200°C, p = 1 ÷ 200bar) and then subjected to mechanical test at constant displacement in gaseous hydrogen environment, with reference to ASTM E 1681. Diffusible hydrogen content is measured at the end of the test for each specimen to correlate mechanical performance and H content in the metal.