摘要
研究裂纹的形成和扩展规律是钢结构疲劳断裂的一个重要课题。该文讨论了一种十分经济有效的检测钢结构疲劳裂纹萌生与扩展的方法,即Beach Marking方法。首先简要总结了该方法的发展历史和研究现状,并系统归纳了其基本原理和关键问题。同时,通过焊接H型钢梁的试验案例,探索该方法应用在大尺寸构件上的实际效果,并具体展示该方法的设计步骤和应用过程。试验表明,Beach Marking方法简单实用,关键在于设计合理的疲劳荷载序列;通过分析疲劳断口上留下的疲劳弧线,并结合断裂力学理论,可以获得疲劳裂纹的扩展规律和参数,为钢结构疲劳寿命数值分析提供科学依据。
For fatigue fracture of steel structures, it is an important issue to investigate crack initiation and propagation behavior. Beach marking technique is discussed, which is a low-cost and effective method for detecting fatigue crack initiation and propagation in steel structures. The development history and research status of this method are reviewed. The basic principles and key challenges of this method are summarized. Meanwhile, fatigue tests on welded H-section steel beams were carried out to explore its practical effect for the application in full size structural members, which demonstrate how to detect fatigue crack initiation and propagation. It is concluded that beach marking technique is an effective approach to investigate the behavior of fatigue crack growth. The key point of this method is to design a proper loading spectrum. Fatigue crack propagation law and relevant parameters can be obtained by analyzing beach markings left on the surface of fatigue fracture as well as using theory of fracture mechanics, which provides scientific basis for numerical analysis of fatigue life of steel structures.
出处
《工程力学》
EI
CSCD
北大核心
2016年第8期93-100,131,共9页
Engineering Mechanics
基金
国家自然科学基金项目(51078291
51478334)
