汽轮机联轴器螺栓剪切疲劳试验研究.pdfVIP

Journal ofMechanical Strength 2002, 24(4):588～ 590 ① EXPERIMENTAL STUDYON TORSIONAL FATIGUE BEHAVIOR OF COUPLING BOLTFOR THE STEAM TURBINE ② 　　　　 (华北电力大学(北京)动力工程系, 北京 102206) PU Zelin　LIU Zongde　YANG Kun　MAO Xueping (Department of Thermal Power Engineering, North China Electric Power University (Beji ing ),Bejiing 102206, China) 　, , 95%、5% 40CrNiMoA —, 。 , , von Mises 。 , 。 　40CrNiMoA　　　　 　TG115.57 　TH140.1 Abstract　The torsional low-cycle fatig e(TLCF)experiments were performed at room temperat re in air on thin-walled t b lar specimens of the 40CrNiMoA steel, the co pling bolt material for the steam t rbine.Data for cyclic stress-strain parameters and strain- life parameters are presentedwith 95% believe degree and 5%error limit.The monotonic and cyclic stress-strain c rves and torsional fa- tig e life c rveswith different reliabilities are also given.The 40CrNiMoA steel exhibits considerable cyclic softening in f lly reversed loading at room temperat re in the torsional test.The material also shows more cyclic softening nder torsional loading than is predicted by the von Mises critierion.Non-dimensionalized peak stress has something to do with non-dimensionalized cycle life only. ey words　40CrNiMoA steel;Torsional low-cycle fatigue;Stress-strain;Cyclic softening;Fatiguelife Correspondent:PU Zelin, E-mail:pzl yl @sina .com, Fa :+86-10-807988469 Man script received in revised form 。 1　 40CrNiMoA 。 、。 45 mm , , 。 :860 ℃, ; , 670 ℃, 。40CrNiMoA , 1 2。 。, ,