Fatigue Crack Growth Rate Tests of High Performance Steel HPS 485W
Research in this paper is about fatigue and fracture behavior of high performance steel HPS485W produced in Wuyang Steel Factory in China.Fatigue crack growth rate (da/dN) test was conducted for HPS 485W compact specimens with thickness of 7.5mm,12.5mm and 19.5mm under different fatigue load ratio (R=Fmin/Fmax=0.1,0.5 and 0.8),respectively.The seven-point incremental polynomial method was adopted for local fitting to obtain fatigue crack growth rate.The test results show that HPS485W has better crack growth resistance compared with traditional steel 14MnNb.Whats more,specimen thickness is an influencing factor for crack growth rate,and fatigue crack growth rate increases with the increase of fatigue load ratio R.For 19.5mm specimen under fatigue load with R=0.1,the engineering threshold was tested and numerical calculation was conducted to obtain theoretical threshold.The calculated theoretical threshold is 7.22MPa.m0.5.Fatigue life of high performance steel bridge can be predicated based on tested fatigue crack growth rate curve.Study in this paper serve as test basic for the fatigue control and fracture control of high performance steel bridge.
high performance steel fatigue crack growth rate stress intensity factor threshold value fracture
Lan Duan Chun-sheng Wang Shi-chao Wang
Engineering Research Center for Large Highway Structure Safety of Ministry of Education,College of Highways,Changan University,710064,China
国际会议
北京
英文
1-6
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）