孙明明,赵海盛,方宏远,李昕.基于等效形状的不规则缺陷管道失效压力评估方法[J].表面技术,2022,51(8):319-329.
SUN Ming-ming,ZHAO Hai-sheng,FANG Hong-yuan,LI Xin.Failure Pressure Evaluation Method of Pipeline with Irregular-shaped Defect Based on Equivalent Shape[J].Surface Technology,2022,51(8):319-329 |
| 基于等效形状的不规则缺陷管道失效压力评估方法 |
| Failure Pressure Evaluation Method of Pipeline with Irregular-shaped Defect Based on Equivalent Shape |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.08.028 |
| 中文关键词: 钢制管道 等效形状 不规则缺陷 失效压力 评价方法 内压 |
| 英文关键词:steel pipeline equivalent shape irregular-shaped defect failure pressure evaluation method internal pressure |
| 基金项目:国家重点研发计划重点专项(2016YFC0802301);国家自然科学青年基金(52001056) |
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| Author | Institution |
| SUN Ming-ming | School of Water Conservancy and Civil Engineering, Zhengzhou University, Zhengzhou 450001, China |
| ZHAO Hai-sheng | State Key Laboratory of Coastal and Offshore Engineering, Liaoning Dalian 116024, China ;Institue of Earthquake Engineering, Dalian University of Technology, Liaoning Dalian 116024, China |
| FANG Hong-yuan | School of Water Conservancy and Civil Engineering, Zhengzhou University, Zhengzhou 450001, China |
| LI Xin | State Key Laboratory of Coastal and Offshore Engineering, Liaoning Dalian 116024, China ;Institue of Earthquake Engineering, Dalian University of Technology, Liaoning Dalian 116024, China |
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| 中文摘要: |
| 目的 提高不规则缺陷管道失效压力评估效率和预测结果的准确度。方法 采用实体有限元模型对不规则形状缺陷管道的失效压力进行了实例研究。有限元模型由1个浅腐蚀缺陷和1个深腐蚀缺陷组成，其中深腐蚀缺陷包含在浅腐蚀缺陷内。分析了深腐蚀缺陷的长度和深度对不规则形状缺陷管道失效压力的影响。根据缺陷深度剖面的不规则性，将缺陷分为3类，第1类缺陷的不规则度为1≤d/dave＜1.2，该类型缺陷的轴向投影形状可以等效为矩形;第2类缺陷的不规则度为1.2≤d/dave≤1.5，该类型缺陷的轴向投影的等效形状介于矩形和抛物线之间;第3类缺陷的不规则度为1.5＜d/dave，该类型缺陷的轴向投影形状可以等效为抛物线。结果 基于等效形状的有效深度和评估长度，通过改进DNV-RP-F101准则提出了一种预测不规则形状缺陷管道失效压力的新方法。该方法首先通过缺陷长度确定评估长度，然后结合不规则度和有效深度取值模型，得到该缺陷有效深度数值，最后将评估长度和有效深度引入DNV-RP-F101准则进行失效压力评估。结论 采用新的评价方法对不规则形状缺陷管道的失效压力进行了预测，结果与不同等级管道的试验结果吻合较好。文中方法的平均误差仅为1.69%，相比现有评价方法中误差最小的有效面积法，误差降低了86.37%。 |
| 英文摘要: |
| The relation between the failure pressure of pipeline with irregular-shaped defect and the characteristic geometric parameters is more complex than regular-shaped defect. Therefore, it is necessary to study the evaluation method of failure pressure of pipeline with irregular-shaped defect. The failure pressure of pipeline with irregular-shaped defect is mainly determined by the evaluation range and the irregularity, which is defined as the ratio of the maximum value to the average value of defect depth. In order to improve the efficiency of failure pressure assessment and the accuracy of prediction results of pipeline with irregular-shaped defect, the paper presents a case study on the failure pressure of irregular-shaped defect using solid Finite Element models. The case is composed of shallow patch and deep defect and the deep defect are included in the shallow patch. The effect of the length and depth deep defects on the failure pressure of pipeline with irregular-shaped defect are analyzed. According to the evaluation scope and defect length of irregular defects, the calculation model of evaluation length is proposed. Case 1 and case 2 are composed of a shallow defect and one deep defect, which are used to analyze the relationship between failure pressure and irregularity of the defect. Case 1 is used to analyze the influence of the length of deep defect on the failure pressure, and case 2 is used to analyze the influence of the depth of deep defect on the failure pressure. According to the irregularity of the depth profile, the defect is divided into three categories:the irregularity of the first type of defects is 1≤d/dave＜1.2, and the axial projection shape of this type of defects can be equivalent to a parabola, The irregularity of the second type of defect is 1.2≤d/dave≤1.5, the axial projection shape of this type of defects can be equivalent to a rectangle, and the irregularity of the third type of defects is 1.5＜d/dave. The equivalent shape of the axial projection of this type of defect is between rectangle and parabola. According to the equivalent shape of the defect with different irregularity, the value model of the effective depth of the defect is obtained. Combined with the effective depth of equivalent shape and the evaluation length, a new method is proposed for predicting failure pressure of steel pipeline with irregular-shaped defect by improving the DNV-RP-F101 criterion. Firstly, according to the length of the irregular-shaped defect, the evaluation length is determined. Then the effective depth of the defect is determined by combining the depth ratio of deep and shallow defects. Finally, the evaluation length and effective depth are introduced into the failure pressure calculation formula to evaluate the failure pressure. The predictions of burst capacity with the new method of the pipeline with irregular-shaped defect are in good agreement with experimental results for different steel grades. The average error of the method proposed in this paper is only 1.69%. Compared with the effective area method with the smallest error in the existing evaluation methods, the error is reduced by 86.37% |
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