440 MPa级高强钢焊缝金属的断裂韧性

曾道平, 安同邦, 郑韶先, 代海洋, 曹志龙, 马成勇

Fracture Toughness of Weld Metal of 440 MPa Grade High-strength Steel

ZENG Daoping, AN Tongbang, ZHENG Shaoxian, DAI Haiyang, CAO Zhilong, MA Chengyong

表4 疲劳裂纹扩展速率试验结果

Table 4 Results of fatigue crack growth rate tests

Pmax / kN a0 / mm af / mm N / cycle C m R2 da/dN-ΔK 13 12.8064 29.7039 426456 2.6841 × 10-9 3.1678 0.9830 2.6814 × 10-9 (ΔK)3.1678 15 13.6590 29.4438 147585 2.1048 × 10-9 3.2118 0.9898 2.1048 × 10-9 (ΔK)3.2118 17 13.2626 28.0428 112577 2.8874 × 10-9 3.0869 0.9984 1.8856 × 10-9 (ΔK)3..0869