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油气输送管道疲劳裂纹起裂特性与影响因素

DOI: 10 3969/j.issn.1006-7043.201108008

Keywords: 油气管道, 疲劳裂纹, 裂纹起裂, 残余应力, 应力强度因子

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Abstract:

为了研究油气输送管道中疲劳裂纹的扩展特性,在疲劳载荷的作用下在试件中导入了倾斜疲劳裂纹,以此模拟油气管道中存在的实际裂纹.实验采用疲劳载荷的应力比为??0和??-1,??疲劳裂纹的倾斜角度为45°.通过测量沿着裂纹开口方向和滑移方向的不连续位移量,计算管道中用作裂纹起裂判据的Ⅰ型应力强度因子??(KⅠ)mes,和Ⅱ型应力强度因子(KⅡ)mes ,以及抑制裂纹开口和滑移方向位移的应力强度因子(KⅠ)s和(KⅡ)s;讨论了疲劳裂纹的应力强度因子(KⅠ)s和(KⅡ)s的影响因素.其结果是:对于应力比0和-1的疲劳裂纹,(KⅠ)s和(KⅡ)s都小于零;而回火后的裂纹的(KⅠ)s和(KⅡ)s都接近于零,即压缩残余应力将对裂纹起裂(初始扩展)起到限制和阻碍的作用.

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