【作者】 王庆五； 杨晓光； 齐红宇； 石多奇；

【Author】 WANG Qing-wu YANG Xiao-guang Qi Hong-yu Shi Duo-qi (School of Jet Propulsion,Beijing University of Aeronautics and Astronautics,Beijing 100083,China)

【机构】 北京航空航天大学能源与动力工程学院；

【摘要】 单晶镍基合金在涡轮叶片上得到越来越广泛地应用,对单晶材料本构模型的研究也在不断地深入。本文运用晶体学理论,结合现象学的统一本构模型的优点,进行了单晶镍基合金的本构建模,模型基于晶体学滑移理论,在单晶八面体12个滑移系和立方体6个滑移系的微观水平上建立粘塑性流动方程和硬化方程,该方程采用粘塑性统一本构方程的一般形式。建模过程表明晶体模型物理意义更明确,计算结果则表明模型是准确的。更多还原

【Abstract】 Single crystal nickel base superalloys have been used in gas turbine blade more and more widely.In order to utilize the advantages of single crystal alloys,constitutive models have been developed at the same time.In this paper,a new constitutive models is proposed for single crystal alloys,in which phenomenological models’ advantages are made used of,based on crystallographic theory.Based on crystallographic slip system principle,the viscoplastic flow equations are set up on eight octahedral slip systems and six cubic slip systems.In microscopic lever,the general unified constitutive formulations are used for the flow equations and hardening law.The modeling procedures and results show that the crystallographic model has more clear physical meaning and is exact.更多还原