采用模拟多孔材料拉伸试验,建立了含孔洞型损伤管线钢的宏观力学性能退化规律模型.结果表明:管线钢的弹性模量和屈服强度随孔隙率的增大而显著降低,对于X70管线钢,当孔隙率达到50%时,材料表观弹性模量和屈服强度降为零.基于损伤理论,将用于评价体积型缺陷的API RP 579公式进行了改进,建立了点腐蚀损伤管道的剩余强度评价公式.算例分析结果表明:将点腐蚀缺陷简化为局部腐蚀缺陷,其保守程度随点腐蚀深度增加而增大,当最大点腐蚀深度小于t/10时,这种简化处理在工程上可以接受.
参考文献
| [1] | 柯伟 .中国腐蚀调查报告[R].北京:化学工业出版社,2003. |
| [2] | 赵新伟;路民旭;白真权 等.在役输气管道腐蚀特点及腐蚀类型调查[J].石油专用管,1998,6(02):47-51,62. |
| [3] | 赵新伟;路民旭;白真权 等.管线腐蚀剩余强度评价的研究现状及发展趋势[J].石油专用管,1997,5(04):9-14. |
| [4] | Milne I;Ainsworth R A;Dowling A R et al.Assessment of the integrity of structures containing defects-CEGB report R/H/R6-Rev.3[J].International Journal of Pressure Vessels and Piping,1988,32:3-104. |
| [5] | BS 7910-1999.BS 7910-1999.Guide on methods for assessing the acceptability of flaws in fusion welded structures[S]. |
| [6] | Kiefner J F;MaxeyWA;EiberRJ.Failure stress levels of flaws in pressurized cylinders[A].,1973:461-481. |
| [7] | Maxey W A;Kiefner J F;Eiber R J.Ductile fracture initiation,propagation and arrest in cylindrical vessels[A].,1972:70-81. |
| [8] | ANSI/ASME B31G-1991.ANSI/ASME B31G-1991.Manual for determining the remaining strength of corroded pipelines[S]. |
| [9] | CAN/CSA-Z184-M86-1986.CAN/CSA-Z184-M86-1986.Gas pipeline systems[S]. |
| [10] | DNV RP F101-1999.DNV RP F101-1999.Corroded Pipelines[S]. |
| [11] | API 579-2000.API 579-2000.Recommended practice for fitness-for-service[S]. |
| [12] | Karl Ingmarssor.Fitness-for-service and decisions for petroleum and chemical equipment[A].New York:ASME,1995:1-6. |
| [13] | 余寿文;冯西桥.损伤力学[M].北京:清华大学出版社,1997:10-12. |
| [14] | Zheng M;Zheng X .Expressions for predicting the elasticity modulus of materials reinforced by 2nd phase grains[J].Metallurgical and Materials Transactions,1991,22A:507-511. |
| [15] | 郑茂盛;罗子健;郑修麟 .含随机空穴材料的屈服行为[J].科学通报,1992,37(12):512-516. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%