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本文依据文献［１］所建立的管道环向裂纹在简单加载下的撕裂失稳与塑性失稳应力的近似关系式，构造了复合加载下撕裂失稳与塑性失稳应力的工程近似关系表达式：并针对４种材料、４０种裂纹构形工况，进行了失稳评定计算：经与文献［２］提出的精细分析方法所得的结果对比，一般偏离不超过４％，满足了工程评定要求，鉴于ＬＢＢ稳定性分析的工程估算方法易于被非专业人员掌握和接受，并能省时省力，预计将能对ＬＢＢ评估技术的发展起重要的作用。
Based on the approximate relationship between the tearing instability and plastic instability stress of circular ring crack under simple loading established in [1], the approximate relationship between tearing instability and plastic instability stress under composite loading is constructed Expression: And for four kinds of materials, 40 kinds of crack configuration conditions, the calculation of instability assessment: Compared with the results of the fine analysis method proposed in [2], the general deviation of not more than 4%, to meet the engineering Assessment Requirements Given that LBB stability analysis engineering estimation methods are easily mastered and accepted by non-professionals and save time and effort, it is expected that LBB assessment techniques will play an important role in the development of LBB assessment techniques.