多工况条件下高温蠕变失效因子的计算方法  

Calculation method for failure factor of high-temperature creep under multi-working-conditions

作　　者：马连骥[1] 赵建平[1] 

机构地区：[1]南京工业大学机械与动力工程学院,江苏南京210009

出　　处：《南京工业大学学报（自然科学版）》2010年第6期107-110,共4页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：国家高技术研究发展计划(863计划)资助项目(2006AA04Z439)

摘　　要：API 581中对高温部件的风险分析,采用Larson-Miller方法进行失效可能性的计算.在长期蠕变失效因子的计算过程中,只以单一的工况参数来确定失效因子值,这对经受多工况操作条件的高温部件不适用.通过对长期蠕变累积损伤与失效概率之间关系的推导,提出多工况下的长期蠕变失效因子的计算方法.实例证明推导出的新方法比原API 581方法更加准确.For the risk analysis of the high-temperature components in API 581,a Larson-Miller method was used to calculate the failure probability.Usually,only normal operating parameters were used to determine the long-term creep failure factor.High-temperature components usually suffered from complicated operating conditions,the calculation method for the failure factor including single condition was not be suited for multi-working-conditions.By deducing the relationship between the cumulative damage of long-term creep and the failure probability,the method for calculating the long-term creep failure factor was proposed,and multi-working-conditions were considered.An example proved that the new method was more accurate than the original API 581.

关 键 词：高温蠕变 Larson-Miller方法 多工况 累积损伤 API581 

分 类 号：X933[环境科学与工程—安全科学]