摘要
用恒应变速率法测定高温管道蠕变内应力并预测其残余寿命,不管是以蠕变极限为失效准则,还是以持久强度为失效准则,都可获得令人满意的结果;而以蠕变极限为失效准则的蠕变内应力法与常规的以蠕变试验为基础的等温外推法相比,还具有试验时间短的优点。
Creep internal stress of high temperature piping measured by constant strain rate (CSR) method has been applied to predicting the residual life of high temperature piping.The results show that the approach to the prediction of residual life can reasonably meet the needs with both the creep limit failure criterion and the rupture life criterion.It is also shown that under the creep limit failure criterion, the creep internal stress method has the advantage of less test time in comparison with the isothermal extrapolation method based on conventional creep tests.
关键词
蠕变
应力
管道
预测
creep
creep test
constant strain rate(CSR)
creep internal stress
residual life
high temperature piping
