13th International Conference on Fracture June 16–21, 2013, Beijing, China 3 1 3.2 120~145 23~30 104 2.88 2.02 B others 4.0 180~196 25~35 112 3.68 3.02 Table 4 The CTOD experimental results of EQ70/56 specimen with 38 mm thickness Technical parameter Crack Position NO.of specimens /mm B /mm W 0 /mm a /mm uδ Available Test 1 26.03 52.03 26.364 0.099 Available 2 25.99 52.02 27.026 0.137 Available A Welding seam center 3 26.04 52.04 26.360 0.122 Available 1 29.99 59.96 30.156 0.243 Available 2 30.09 60.01 29.823 0.222 Available B Welding seam center 3 30.09 59.90 29.990 0.192 Available 3 Uniaxial tensile test and results Take an uniaxial tensile test on the EQ7/56 specimen with the Electric Servo-hydraulic Material Test system, under the guidance of the Standard, “Metallic materials Tensile testing at ambient temperature”[8]. The present paper take a butt-welding joint of EQ70/56 as an specimen(d0=4mm), and get its stress-strain curve, some basic outputs were list in the table 7. Table 7 Basic data of the uniaxial tensile test NO.of Specimens EQ70/56 EQ70-HAZd6 Shape of Specimen Circular cross section Circular cross section Diameter(mm) 4.01 3 So(mm^2) 12.63 7.069 Lo(mm) 19.9 15.4 Extensometer gauge length(mm) 50 50 Fm(kN) 10.46 5.65 Tensile Strength Rm(MPa) 830 800 FeH(kN) / 5.42 Upper Yield Strength ReH(MPa) / 765 FeL(kN) / 5.24 Lower Yield Strength ReL(MPa) / 740 Fp(kN) 9.25 5.36 Proof Strength Non-proportional Extension 730 760
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