Because of its advantages of good development foundation,short design cycle,compact structure and strong fuel adaptability,the aero-derivative gas turbine has been widely used in the field of offshore oil and gas platform,marine power and pipeline transportation,etc.For the aero-derivative gas turbine blades working in high temperature,high pressure and other harsh environments,creep is one of the main failure modes.In order to ensure the operation reliability of the blade,nickel-based alloy with strong creep resistance is usually selected as its constitutive material.The nickel-based alloy has obvious third stage of creep,occupying a relatively high proportion of its whole life.The current creep damage constitutive model is difficult to accurately characterize the failure behavior of the third stage of creep for the nickel-based alloys.In response to the above problem,a creep damage constitutive model which can reasonably describe the third stage of creep of the high temperature materials is proposed in this paper.The model is validated by comparing with the creep experimental data under different temperatures.The proposed model can provide a theoretical guideline for accurate life prediction and reliability design of the high temperature components of aero-derivative gas turbines.
关键词
航改型燃气轮机/蠕变/寿命预测/本构模型
Key words
aero-derivative gas turbine/creep/life prediction/constitutive model
维普
万方数据