Constitutive Model and Fracture Criterion of Q345 Steel Welded Joints

Table 1

The specimens of round bars.

No.	Material	Test piece quantity	Opening radius of notch, R (mm)	The minimum straight notch section, 2a (mm)	Section diameterof specimen, D (mm)	Standard distance, L1 (mm)	Average triaxial stress of necking section
B-6-SB	BMZ	3	—	6	6	30	0.33
B-6-B	BMZ	3	—	6	6	—	0.33
B2-6-B	BMZ	3	2	6	7	—	0.64
B0.5-6-B	BMZ	3	0.5	6	7	—	1.18
B-6-SH	HAZ	3	—	6	6	30	0.33
B-6-H	HAZ	3	—	6	6	—	0.33
B2-6-H	HAZ	3	2	6	7	—	0.64
B0.5-6-H	HAZ	3	0.5	6	7	—	1.18

Note. The first letter B represents the round bar sample (bar); the last letter B represents the base metal zone, H represents the heat-affected zone, and S represents the standard specimen. The first number indicates the opening radius of the notch, and the second number indicates the minimum diameter of the notch section. For example, B2-6-B, round bar of BMZ, with notch radius of 2 mm and minimum diameter of notch section of 6 mm.