基于裂纹尖端张开角含轴向穿透裂纹X80管道极限压力预测
发布时间：2019-04-02 01:08
【摘要】：准确预测含轴向穿透裂纹管道极限压力对其安全运行具有重要意义,但现有极限压力预测模型已不满足高韧性、高强度X80管道的评定需求。对含轴向穿透裂纹X80管道极限压力进行研究,建立含轴向穿透裂纹X80管道壳单元与三维实体单元数值模型,应用壳单元模型替代三维实体单元模型以简化分析过程并提高计算效率。基于含裂纹管道壳单元模型,选用临界裂纹尖端张开角作为断裂参量,分析初始裂纹长度、检测单元长度、管道壁厚等不同因素对极限压力的影响,提出极限压力预测修正模型。将基于修正模型的管道爆破压力预测结果与试验测试结果进行对比分析。结果表明,初始裂纹长度与极限压力呈负相关关系;而检测单元长度和管道壁厚与极限压力呈正相关关系,且壁厚与极限压力基本呈近线性关系;三者均对极限压力具有较为显著的影响。该模型具有更高的准确性,可用于高韧性、高强度薄壁X80管道的止裂设计。
[Abstract]:Accurate prediction of the ultimate pressure of pipeline with axial penetration crack is of great significance for its safe operation, but the existing prediction models of ultimate pressure no longer meet the assessment requirements of high toughness and high strength X80 pipeline. The ultimate pressure of X80 pipeline with axial penetrating crack is studied, and the numerical model of shell element and three-dimensional solid element of X80 pipeline with axial penetrating crack is established. The shell element model is used to replace the three-dimensional solid element model to simplify the analysis process and improve the computational efficiency. Based on the shell element model of pipe with cracks, the critical crack tip opening angle is selected as the fracture parameter to analyze the influence of different factors, such as initial crack length, detection element length and pipe wall thickness, on the ultimate pressure. A modified model for prediction of limit pressure is proposed. The prediction results of pipeline blasting pressure based on the modified model and the test results are compared and analyzed. The results show that the initial crack length is negatively correlated with the ultimate pressure, while the detection element length and the pipe wall thickness have a positive correlation with the ultimate pressure, and the wall thickness is almost linear with the ultimate pressure. All of them have a significant effect on the ultimate pressure. The model is more accurate and can be used for crack arrest design of thin wall X80 pipe with high toughness and strength.
【作者单位】： 中国石油大学储运与建筑工程学院;中国石油大学山东省油气储运安全重点实验室;机械结构强度与振动国家重点实验室;中国石化胜利石油工程有限公司钻井工艺研究院;中国石油辽河油田分公司特种油开发公司;
【基金】：国家自然科学基金项目(11472309) 国家重点研发计划项目(2016YFC0802306) 中央高校基本科研业务资助项目(14CX02208A) 国家重点实验室开放课题(SV2017-KF-02)
【分类号】：TE973
本文编号：2452082
[Abstract]:Accurate prediction of the ultimate pressure of pipeline with axial penetration crack is of great significance for its safe operation, but the existing prediction models of ultimate pressure no longer meet the assessment requirements of high toughness and high strength X80 pipeline. The ultimate pressure of X80 pipeline with axial penetrating crack is studied, and the numerical model of shell element and three-dimensional solid element of X80 pipeline with axial penetrating crack is established. The shell element model is used to replace the three-dimensional solid element model to simplify the analysis process and improve the computational efficiency. Based on the shell element model of pipe with cracks, the critical crack tip opening angle is selected as the fracture parameter to analyze the influence of different factors, such as initial crack length, detection element length and pipe wall thickness, on the ultimate pressure. A modified model for prediction of limit pressure is proposed. The prediction results of pipeline blasting pressure based on the modified model and the test results are compared and analyzed. The results show that the initial crack length is negatively correlated with the ultimate pressure, while the detection element length and the pipe wall thickness have a positive correlation with the ultimate pressure, and the wall thickness is almost linear with the ultimate pressure. All of them have a significant effect on the ultimate pressure. The model is more accurate and can be used for crack arrest design of thin wall X80 pipe with high toughness and strength.
【作者单位】： 中国石油大学储运与建筑工程学院;中国石油大学山东省油气储运安全重点实验室;机械结构强度与振动国家重点实验室;中国石化胜利石油工程有限公司钻井工艺研究院;中国石油辽河油田分公司特种油开发公司;
【基金】：国家自然科学基金项目(11472309) 国家重点研发计划项目(2016YFC0802306) 中央高校基本科研业务资助项目(14CX02208A) 国家重点实验室开放课题(SV2017-KF-02)
【分类号】：TE973
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