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。
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.
出处
《推进技术》
EI
CAS
CSCD
北大核心
1996年第3期50-55,共6页
Journal of Propulsion Technology
基金
航空基金
西安交大力学开放基金
关键词
叶片
镍基合金
粘塑性
有限元法
Blade,Nickel base superalloy,Viscoplasticity,Strain rate,Finite element method,Constitutive equation
