含环向裂纹等径焊制三通极限压力(II)——工程估算方法

Limit pressure for equal-diameter welded pipe branch junctions containing circumferential cracks part (Ⅱ) -- an approximate calculation approach

采用极限分析的下限定理 ,以石油化工行业常见的含腹部中心裂纹等径三通为研究对象 ,在合理简化的基础上推导出极限压力的估算公式 ,试验数据和有限元数值解验证结果表明 ,该表达式不仅简洁 ,而且具有较高的计算精度 ,对含缺陷三通的完整性评定具有重要的参考价值。

Based on the lower boundary theory of limit analysis, an approximate calculation formula that could be used to estimate the limit pressure of equal diameter welded pipe branch junction was presented. The new formula has a high accuracy in calculating the limit load and simple form, and its correctness and reasonableness were borne out by the experimental results and FE numerical solutions. It will bring forth a great value by applying this formula in integrity assessment of pipefitting.