摘要
将Hill屈服准则用于DD3单晶不同温度不同取向的屈服应力预测,结果表明:Hill屈服准则中材料参数的选择对计算结果有很大的影响,且不能同时准确预测单晶三个主要承载方向的屈服强度。根据单晶材料的屈服特点,考虑到单晶材料在任意方向上剪应力及其相互作用对屈服强度的影响,通过在Hill屈服函数中加入一修正项建立了适用于单晶的新屈服函数,能对晶体取向为[001],[011]和[111]的屈服强度进行非常准确的预测,在其它方向上结果也比较满意。
Hill＇s yield criterion for plastically orthotropic solids is used to predict the yield stress of single crystal alloys DD3 at different temperature along different orientations.Results showed that the prediction precision was greatly affected by the choice of material parameters in Hill criteria and the yield stress of single crystal along three primary loading orientations couldn＇t be predicted accurately at the same time.Taking into account the effects that the components of tension and torsion stresses are coupled with each other,a new yield criterion for single crystal nickel-based superalloys is put forward in term of the characteristics of single crystal nickel-based superalloys by introducing a modified item into Hill ＇s yield criterion.Using the new yield criterion to predict the yield stresses of single crystal alloys,the correlation along , and orientations to experiments is very good and more accurate than that of Hill＇s,other orientations is satisfied also.
出处
《航空材料学报》
EI
CAS
CSCD
北大核心
2010年第3期70-73,共4页
Journal of Aeronautical Materials
基金
国家自然科学基金(50875080)
