摘要
基于三维正交各向异性弹性有限元分析和晶体滑移理论;;分析了单晶涡轮叶片在其工作状态下的应力状态和蠕变寿命与叶型积叠线方向的晶体取向偏角、随机取向的晶向角之间的关系。分析结果表明:叶型积叠线方向的晶体取向偏角和随机取向的晶向角;;对单晶叶片的应力状态和蠕变寿命具有较大的影响;;但二者对叶片蠕变寿命的影响规律是不同的。充分利用晶体取向偏角和晶向角;;在不增加叶片重量的前提下;;有利于进一步发掘材料潜力;;因此对单晶叶片的晶向进行优化设计;;具有重要的工程应用价值。
Nickel based single crystal has been widely used for turbine blades in aero-engines due to the excellent high-temperature creep and fatigue properties. However, in most casting process, only one crystallographic orientation of turbine blade is controlled, other two orientations are left random. Based on orthotropic elasticity three-dimensional finite element calculation and crystallographic theory, the influence of controlled and uncontrolled orientation on elastic stress state and creep life of single crystal DD3 has been investigated. Comprehensive analyses reveal that controlled orientation and uncontrolled orientation have profound influence on single crystal DD3 mechanical behavior and creep life of blade. Single crystal blade has the potential to increase creep life by controlling blade′s crystallographic orientation without adding weight.
出处
《燃气涡轮试验与研究》
2004年第2期18-22,共5页
Gas Turbine Experiment and Research
基金
国家自然科学基金(5005016)
航空科学基金(02C53011)
