13th International Conference on Fracture June 16–21, 2013, Beijing, China -5- 0.2 3.16~3.33 2.25~4.29×10-9 0.99 0.5 3.58~4.08 3.08~9.28×10-10 0.99 Table 4. Re-fitting result after HPS 485W da/dN test Regression Parameters Thickness R m C（m/cycle） logC Correlation coefficient 0.1 3.17 3.71×10-12 -11.43 0.91 0.5 3.17 4.58×10-12 -11.34 0.87 7.5mm 0.8 3.17 4.65×10-12 -11.33 0.93 0.1 3.17 2.85×10-12 -11.54 0.82 0.5 3.17 3.95×10-12 -11.4 0.61 12.5mm 0.8 3.17 5.24×10-12 -11.28 0.61 0.1 3.17 2.95×10-12 -11.53 0.83 0.5 3.17 3.85×10-12 -11.41 0.96 19.5mm 0.8 3.17 4.20×10-12 -11.38 0.95 Zhang et al. conducted da/dN test for 24mm 14MnNbq at room temperature by three-point loading specimen, which is applied in steel and concrete composite railway bridge in Qinghai-Tibet railway system [9]. For 14MnNbq base steel, the tested parameters in Paris equation is C=1.4763×10-10m/cycle and m=2.1413, which shows HPS 485W has greater fatigue crack growth resistance than 14MnNbq. The comparative results demonstrate better fatigue resistance of HPS 485W. 4. Conclusions This paper conducted fatigue crack growth rate (da/dN) test to study fatigue resistance of high performance steel HPS 485W. The da/dN test result shows HPS 485W has better fatigue crack growth resistance than traditional steel. The fatigue crack growth rate of HPS 485W is determined by Paris equation, which provides significant parameters in remaining fatigue life calculation of HPS bridge. Research in this paper demonstrates HPS 485W has superior fatigue resistance, and HPS 485W is suggested to be prior used in stress complex part of steel bridge. Acknowledgements The writers would like to acknowledge the financial support provided by Fok Ying Tung Education Foundation (Grant No. 101078), Program for New Century Excellent Talents in University of the Ministry of Education of the P.R. China (Grant No. NCET-07-0121) and the HPS 485W steel plate provided by Wuyang Iron and Steel Co., Ltd.. The writes would also gratefully acknowledge the technical support provided by State Key Laboratory for Mechanical Behavior of Material in Xi’an Jiaotong University. References [1] G. Hamby, G. Clinton, R. Nimins, et al., High Performance Steel Designer’ Guide, Second Edition, U.S. Department of Transportation, San Francisco, 2002. [2] International Association for Bridge and Structural Engineering (IABSE), Use and Application of High Performance Steels for Steel Structures, Structural Engineering Documents 8, 2005.
RkJQdWJsaXNoZXIy MjM0NDE=