ASTM E1820-18,Standard Test Method for Measurement of Fracture Toughness.
ASTM E1820-18 covers procedures and guidelines for the determination of fracture toughness of metallic materials using the following parameters.
Summary of Test Method
The objective of this test method is to load a fatigue precracked test specimen to induce either or both of thefollowing responses (1) unstable crack extension, including significant pop-in, referred to as”fracture instability”in this test method; (2) stable crack extension, referred to as”stable tearing”in this test method. Fracture instability results in asingle point-value of fracture toughness determined at the pointof instability.
Apparatus
Apparatus is required for measurement of applied force,load-line displacement, and crack-mouth opening displacement. Force versus load-line displacement and force versus crack-mouth opening displacement may be recorded digitally for processing by computer or autographically with an x-y plotter. Test fixtures for each specimen type are described in the applicable Annex.
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