重庆大学学报：自然科学版2012，Vol.35Issue(1)：70-75,6.
焊接对热轧H型钢高应变低周疲劳行为的影响
Effect of welding on high strain and low cycle fatigue behavior of hot-rolled H-beam
摘要
Abstract
Low cycle fatigue（LCF）properties of H-beam as hot-rolled and welded are studied, and the cyclic stress-strain relationship and cyclic response characterization are determined. Based on the Coffin-Manson formula, the strain-fatigue life relationship is obtained. Finally, the cyclic toughness, which is the product of strain range at LCF life of 100 cycles and the stress amplitude, are calculated. The test results show that the cyclic toughness as welded H-beam is 62~//oo of that as hot-rolled. Hot-rolled materials exhibit cyclic stability, and welded materials show cyclic softening followed by fracture. The scanning electron microscope（SEM） micrograph of fracture surfaces reveals that the fatigue crack initiates from the coarse grain area of welding joint, and the fine dimple is observed in the fracture surface, which indicates the welding joint remains a good ductility.关键词
H型钢/热轧/焊接/疲劳Key words
H-beam/hot-rolling/welding/fatigue分类
矿业与冶金引用本文复制引用
盛光敏,林振邺,樊良中,吴结才,龚庆华..焊接对热轧H型钢高应变低周疲劳行为的影响[J].重庆大学学报：自然科学版,2012,35(1):70-75,6.基金项目
国家科技攻关资助项目 （）
重庆大学大型仪器设备开放基金资助项目 （）
