13th International Conference on Fracture June 16–21, 2013, Beijing, China 8 According the method in section 5.1and 5.2, the toughness assessment of CTOD could be transferred to the assessment points in the FAD of EQ70/56, the results shown in the table 10. Table 10 The assessment points in the FAD of EQ70/56 Technical parameters Crack position NO. of specimen B/mm δ Ι /mm mat δ /mm Lr 1 26.03 0.012 0.099 1 0.353 2 25.99 0.014 0.137 1 0.315 A welding seam center 3 26.04 0.010 0.122 1 0.284 1 29.99 0.017 0.243 1 0.265 2 30.09 0.016 0.222 1 0.278 B welding seam center 3 30.09 0.015 0.192 1 0.281 Note：In the present CTOD test, the elastic modulus applied in the calculation was measured in the uniaxial tensile test, instead of the parameters given by the manufacturer. The elastic modulus was E'= 2 E 1- μ = 234.5 Gpa, which conduct the yield strength as 729 Mpa. Then mark the coordinates of the assessment points into the PAD of the EQ70/56, as shown in figure 6. Figure 6 FAD of the EQ70/56 with the assessment points 5.4 Error analysis It could get the stress-strain curve through the tensile test while making the toughness assessment of the CTOD of the welding joints. In the meanwhile, the Level-2B assessment required the true stress-strain curve, it should transferred the test data to the true stress-strain curve. The present
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