| X80管线钢管的屈强比对其失效评估曲线的影响 |
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| 引用本文： | 王海涛,李鹤,李洋,吉玲康,黄呈帅,熊庆人,张伟卫.X80管线钢管的屈强比对其失效评估曲线的影响[J].管道技术与设备,2012(5):6-9. |
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| 作者姓名： | 王海涛 李鹤 李洋 吉玲康 黄呈帅 熊庆人 张伟卫 |
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| 作者单位： | 中国石油集团石油管工程技术研究院,陕西西安,710065 |
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| 基金项目： | 陕西省自然科学基础研究计划资助项目 |
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| 摘 要： | X80及以上级别管线钢管的高屈强比是工程应用中的一个突出问题,失效评估曲线是其安全评定的重要依据。文中通过单轴拉伸和断裂韧性试验建立了高屈强比X80管线钢管的特征失效评估图及拟合方程。结果表明：随着钢管屈强比升高,失效评估曲线的截至线（最大载荷比）降低;高、低屈强比钢管的评估曲线在载荷比大于某一临界值时发生分离,且高屈强比钢管的评估曲线处于低屈强比钢管的评估曲线之下;高屈强比钢管的选择3评估曲线比选择1和选择2曲线更偏于安全。
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| 关 键 词： | X80管线钢 屈强比 失效评估 断裂韧性 |
Influence of Y/T Ratio on Failure Assessment Curves for X80 Line Pipe |
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| WANG Hai-tao
,
LI He
,
LI Yang
,
JI Ling-kang
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HUANG Cheng-shuai
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XIONG Qin-ren
,
ZHANG Wei-wei.Influence of Y/T Ratio on Failure Assessment Curves for X80 Line Pipe[J].Pipeline Technique and Equipment,2012(5):6-9. |
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| Authors: | WANG Hai-tao LI He LI Yang JI Ling-kang HUANG Cheng-shuai XIONG Qin-ren ZHANG Wei-wei |
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| Institution: | (Tubular Goods Research Institute of China National Petroleum Corporation,Xi’an 710065,China) |
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| Abstract: | High Y/T ratio is a glaring problem for engineering application of X80 line pipe,and the failure assessment curve(FAC)is the essential basis for the safety assessment.Based on uni-axial tension and fracture toughness tests,the specific failure assessment diagrams and fitted equations are established for X80 line pipe of high Y/T ratio.As the Y/T ratio increases,the permitted limit of the load ratio decreases.The FAC of high T/Y ratio pipe separates from the FAC of low Y/T ratio pipe when the load ratio reaches a critical value and the FAC of high Y/T ratio pipe is below the FAC of low Y/T ratio pipe.The FAC of choice three is more conservative than the FAC of choices one and two for the high Y/T ratio pipe. |
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| Keywords: | X80 pipeline steel Y/T ratio failure assessment fracture toughness |
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