Effect of tensile residual stresses on fatigue crack growth and S-N curves in tubular joints loaded in compression

被引:42
作者
Acevedo, C. [1 ]
Nussbaumer, A. [1 ]
机构
[1] EPFL Swiss Fed Inst Technol, ICOM Steel Struct Lab, CH-1015 Lausanne, Switzerland
基金
瑞士国家科学基金会;
关键词
Welded joints; Fatigue strength; Residual stresses; Fatigue crack growth; Fracture mechanics;
D O I
10.1016/j.ijfatigue.2011.07.013
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
The influence of welding tensile residual stresses on fatigue crack growth in bridge tubular K-joints is investigated through experimental testing of large-scale specimens. Crack development is monitored using the alternating current potential drop method. Crack shape, propagation rate, and the stress intensity factors, are analyzed based on measurements. Current CIDECT design guidelines devoted to K-joints recommend to use the fatigue strength S-N curve category 114. Based on experimental investigations, this category is shown to overestimate the fatigue life of bridge K-joints presenting a low chord slenderness gamma value (gamma < 12). CIDECT guidelines also neglect fatigue from compressive loading; however, the fatigue test results prove that cracks propagate up to a critical size for details loaded in compression. The detail category 100 is proposed to design bridge K-joints loaded in tension or compression. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码:171 / 180
页数:10
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