【作者】 张辉； 唐站站； 胡晓梅； 朱丽影； 诸葛翰卿；

【Author】 ZHANG Hui;TANG Zhan-zhan;HU Xiao-mei;ZHU Li-ying;ZHUGE Han-qing;College of Civil Science and Engineering,Yangzhou University;College of Civil Engineering and Architecture,Zhejiang University of Science & Technology;

【机构】 扬州大学建筑科学与工程学院； 浙江科技学院土木与建筑工程学院；

【摘要】 为研究疲劳损伤后钢材的力学性能退化规律,以Q345qD结构钢为研究对象,对试件施加不同次数的循环荷载形成不同程度的预疲劳损伤,随后再进行拉伸试验,获得钢材的剩余力学性能。在此基础上,分析了不通预损伤等级对钢材力学性能参数的影响,提出了实用的预测公式。结果表明:相对于无损伤材料,疲劳材料表现出相当大的差异。随着预疲劳损伤水平的增加,材料的强度和延性逐渐变差;钢材的屈服应力、极限应力、屈服平台长度和弹性模量等参数随着预疲劳损伤水平的增加而减小,而形状参数和初始切线模量的变化规律则与之相反。更多还原

【Abstract】 In order to study the mechanical properties deterioration of steel material with fatigue damages,Q345qD steel was taken as the research object in this paper.Various pre-fatigue damages were induced by subjecting the specimens to different loading cycles,and subsequent tensile tests were performed to obtain the residual mechanical properties.On this basis,the influence of different pre-damage levels on the mechanical parameters was analyzed and a practical prediction formula was proposed.The results show that,compared with the undamaged materials,the mechanical properties of the fatigue-damaged materials change remarkably.With the increase of the pre-fatigue damage level,the strength and ductility of the material gradually deteriorate.The yield stress,ultimate stress,yield platform length,and elastic modulus decrease with the increase of the pre-fatigue damage level,while the shape parameter and initial tangent modulus change in an opposite way.更多还原