| 摘要: |
| 从位错滑移机理出发，建立了一种适用于Ｎｉ基高温单晶结构分析用的晶体滑移粘塑性本构模型。该模型将八面体、十二面体及六面体滑移系作为潜在的开动滑移系，考虑阻应力和背应力两种内应力状态参量。利用某Ｎｉ基单晶叶片材料在７００℃和９５０℃的试验结果对模型进行了考核并标定了模型参数。进而将所建模型编入有限元结构分析软件中，对某型发动机单晶叶片进行了计算分析。 |
| 关键词: 叶片 镍基合金 粘塑性 应变率 有限元法 本构方程 |
| DOI： |
| 分类号:V232.4 |
| 基金项目:航空基金,西安交大力学开放基金 |
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| A VISCOPLASTIC CRYSTALLOGRAPHIC ANALYSIS OF A NICKEL-BASE SINGLE CRYSTAL BLADE |
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Yue Zhufeng1, Lu Zhenzhou1, Zheng Changqing1, Yin Zeyong2
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1.Dept.of Engineering Mechanics,Northwestern Polytechnical Unly.,Xi’an,710072;2.Nanhua Powerplant Research lust’, Zhuzhou,412002
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| Abstract: |
| Based on dislocation theory,an unified anisotrOPic crystallographic constitute has been developed for nickel-base single crystal superalloys.Detahedral{111} <110>,{111}<112> and cubic{100}<110> slip systems are consdered in the model.The constitute utilizes drag stress and back stress state variables to model the local inelastic flow.The model was tested with the experiments of nickel-base crystal superalloy DD3 at 700 ℃ and 950℃ The model parameters have been also simultaneously obtained at the two temperatures.The constitute has been implemented into a structure finite element program. The strength and life of a nickel-base single crystal turbine blade have been calculated. |
| Key words: Blade Nickel base superalloy Viscoplasticity Strain rate Finite element method Constitutive equation |
