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Thermal-mechanical fatigue behaviour of P92 T-piece and Y-piece pipe

机译：P92 T型管和Y型管的热机械疲劳行为

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摘要

This paper presents a study on thermal-mechanical fatigue (TMF) behavior of P92 T-piece and Y-piece pipe at the most critical working fluctuations. Pressure and temperature in isothermal, in-phase (IP) and out-of-phase (OP) loading conditions were taken into account. Cyclic plasticity model considering the effect of temperature was used, in which both kinematic hardening variable and isotropic hardening variable are included. All the parameters used in the simulation were obtained from low cycle fatigue (LCF) tests at different temperatures. These parameters have been validated through the comparison of experimental data with the simulated data. Then, finite-element models (FEM) of P92 T-piece and Y-piece pipe were developed to investigate the location of the most critical region at typical thermal-mechanical loading. Simulated results reveal that the most dangerous position occurs at the region where the inner surface of horizontal pipe and branch pipe crossed for both T-piece and Y-piece pipe which is irrelevant to the types of loading. IP loading is the most serious working condition for both T-piece and Y-piece pipe. Comparing with T-piece pipe, Y-piece pipe at IP loading is the most dangerous condition.
机译：本文介绍了在最关键的工作波动下P92 T型管和Y型管的热机械疲劳（TMF）行为。考虑了等温，同相（IP）和异相（OP）加载条件下的压力和温度。使用考虑温度影响的循环可塑性模型，其中包括运动硬化变量和各向同性硬化变量。仿真中使用的所有参数均来自不同温度下的低循环疲劳（LCF）测试。通过将实验数据与模拟数据进行比较，已验证了这些参数。然后，开发了P92 T型管和Y型管的有限元模型（FEM），以研究典型热机械载荷下最关键区域的位置。模拟结果表明，最危险的位置发生在与T形管和Y形管相对的水平管和支管的内表面交叉的区域，这与载荷的类型无关。 IP负载是T型和Y型管最严峻的工作条件。与T型管相比，IP负载下的Y型管是最危险的条件。

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