Aiming at the problem that the calculation of the ductile crack growth is too complicated when measuring the CTOD resistance curve of SENT specimens,a new method was proposed to determine the crack tip location and calculate the ductile crack growth rapidly by using the deformation field calculated by digital image correlation technology(DIC).Firstly,two parallel horizontal lines were set up in the elastic region above and below the notch and crack,and then a curve was constructed according to the displacement difference between the two horizontal lines.The critical point of the curve variation amplitude was the position of the crack end,and the crack growth was calculated according to the critical point position.Finally,the crack tip opening displacement(CTOD)was measured and the resistance curve was constructed.The proposed method was compared with another method to measure the resistance curve of CTOD SENT samples by DIC,and the results showed that the proposed method had better fitting effect after simple calculation.
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