基于应力投影的油气管道螺旋裂纹评估方法  

Assessment methods of oil & gas pipeline screwy cracks based on stress projection

作　　者：宋汉成[1] 张海亮[1] 王学力[1] 冯庆善[1] 林逸汉[2] 

机构地区：[1]中国石油天然气股份有限公司管道分公司,北京市100020 [2]上海复旦大学力学与工程科学系

出　　处：《天然气工业》2012年第4期79-82,126-127,共4页Natural Gas Industry

基　　金：中国石油天然气股份有限公司科研基金项目(编号:080320)

摘　　要：目前国内外还没有针对管道螺旋裂纹的相关评估方法。为此,借鉴标准BS 7910中管道轴向裂纹和环向裂纹的评估方法,基于无限大平板斜裂纹将应力分解到裂纹方向及其垂直方向的求解思路,结合有限元模拟,提出了管道螺旋裂纹的评估方法:将螺旋裂纹的计算归结为轴向裂纹和环向裂纹的计算,根据无限大平板斜裂纹轴向裂纹和环向裂纹的复合计算公式,推导出管道螺旋裂纹应力强度因子的近似计算公式,并进行了静水压爆破验证试验。结果表明:该评估方法准确可靠,最大误差为5.62%,可以用于管道螺旋裂纹的工程评估。At present,there is no relevant evaluation method for pipeline screwy cracks in China.Therefore,the paper uses the evaluation method for the axial and circumferential cracks described in the standard BS 7910 for reference.By means of finite element simulation,the paper proposes the following evaluation method based on the solution of infinite flat plate inclined crack: the calculation of screwy cracks comes down to the calculation of axial and circumferential cracks;on this basis of such compound formula,the approximate formula is obtained of the stress intensity factor of pipeline screwy cracks.Through the hydrostatic blasting verification test,it is shown that the evaluation method is accurate and reliable with the maximum error of 5.62%,so it can be used in engineering assessment.

关 键 词：油气管道 螺旋裂纹 工程适用性评估 有限元模拟 应力投影 轴向裂纹 环向裂纹 

分 类 号：TE973[石油与天然气工程—石油机械设备]