作　　者： ; ; ;

机构地区： 南京航空航天大学能源与动力学院

出　　处： 《机械科学与技术》 2011年第10期1623-1628,共6页

摘　　要： 针对某型航空发动机燃烧室部件蠕变分析的需要,对GH188合金的蠕变本构模型进行了研究。基于蠕变-应力分布特征,引入Boltzmann函数发展了一种新的同时包含第一阶段蠕变和第二阶段蠕变的蠕变本构模型。结果表明新模型能很好地拟合GH188合金环形件的蠕变试验曲线,与时间硬化模型、应变硬化模型、通用指数模型及时间硬化—Norton模型相比,能更好地描述材料在不同温度和应力水平下的蠕变行为。该模型应用于GH4169合金证明了其具有更好的适应能力。基于用户可编程功能,在商用有限元软件中开发并验证了新模型的用户材料子程序。 For the need of creep analysis of eombustor chambers in aeroengine, creep constitutive model of GH188superalloy was studied. Based on the feature of creep-stress distribution, the Boltzmann function was introduced to formulate a new creep constitutive model, with primary creep and secondary creep included. The result indicates that the constitutive equations proposed in this paper can correlate the creep test curves of GH188 superalloy very well, and show better results than time hardening model, strain hardening model, generalized exponential model and time hardening-Norton model. This new model also correlates the creep curves of GH419 better than other models. A user material subroutine was developed based on this new model in commercial finite element software and validated bv comparing finite element results with model calculated creed curve.

关 键 词： 高温合金 蠕变 本构模型 有限元 材料子程序

领　　域： [一般工业技术] [航空宇航科学与技术] [航空宇航科学技术]