Method for testing CTOD-delta resistance curve of metal

The invention provides a method for testing a CTOD-delta a resistance curve of metal, which comprises the following steps of: performing cutting pretreatment on to-be-evaluated metal to obtain to-be-tested metal; performing a three-point bending test on the to-be-tested metal to obtain primary to-be-tested metal; performing primary curing liquid filling treatment on the crack of the primary to-be-detected metal to obtain a primary curing mold; according to the primary curing mold, primary crack tip opening displacement and primary crack length variation are determined; the three-point bending test is continuously carried out until N times of crack tip opening displacement and N times of crack length variation are obtained, and N is larger than 2; and obtaining a CTOD-delta a resistance curve of the to-be-evaluated metal according to the tip opening displacement of the N cracks and the length variation of the N cracks. The method for testing the CTOD-delta a resistance curve of the metal, provided by the inven