Effect of compression overload on fatigue strength improved by ICR treatment
Effect of compression overload on fatigue strength improved by ICR treatment
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DOI：
10.1007/s13296-013-1016-7
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发表时间：
2013-04
影响因子：
1.5
通讯作者：
T. Ishikawa;M. Shimizu;H. Tomo;H. Kawano;Kentaro Yamada
中科院分区：
文献类型：
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作者：
T. Ishikawa;M. Shimizu;H. Tomo;H. Kawano;Kentaro Yamada
冲击裂纹闭合技术是通过闭合疲劳裂纹开口来延长钢结构疲劳寿命的一种新技术。通过对焊态条件进行ICR处理，压应力保留在焊趾处。因此，ICR热处理对焊接接头疲劳强度的提高可以达到其它疲劳强度提高技术的水平。然而，如果在ICR处理后经受压缩过载，则焊趾处的残余压应力将使拉应力区域移动。因此，ICR处理提高的焊接接头疲劳强度在压缩过载后会降低。为了研究压缩过载对ICR处理提高疲劳强度的影响，进行了面外节点板疲劳试验。结果，在名义应力为-190 MPa的压缩过载条件下，通过ICR处理提高的疲劳强度几乎没有降低。
ICR (Impact Crack-closure Retrofit) treatment was developed for extending fatigue life of cracked steel structures by closing the fatigue crack opening. By applying the ICR treatment to as-welded condition, compressive stress remains at weld toe. Therefore, ICR treatment can be used for the improvement of fatigue strength of welded joint at the same level of the other fatigue strength improved techniques. If a compression overload is subjected after ICR treatment, however, the residual compressive stress at weld toe will shift the tensile stress region. Accordingly, improved fatigue strength of welded joints by ICR treatment will be reduced after the compression overloaded. In order to investigate the effect of the compression overload on fatigue strength improved by ICR treatment, fatigue tests of out-of-plane gusset specimens were carried out. As the results, fatigue strength improved by ICR treatment was hardly reduced under the compression overload condition of nominal stress of −190 MPa.