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总览 评价 于庆民 * ( 西北工业大学力学与土木建筑学院,西安 710072; ) 摘要: 本文采用考虑运动强化的晶体塑性模型研究镍基单晶合金的疲劳蠕变交互作用,用有限元方法模拟了在温度梯度下单晶合金薄壁圆管模拟试样的疲劳蠕变交互作用。计算结果表明考虑
于庆民*
(
西北工业大学力学与土木建筑学院,西安 710072; )
摘要:
本文采用考虑运动强化的晶体塑性模型研究镍基单晶合金的疲劳蠕变交互作用,用有限元方法模拟了在温度梯度下单晶合金薄壁圆管模拟试样的疲劳蠕变交互作用。计算结果表明考虑运动强化的本构模型可以描述单晶合金的疲劳蠕变交互作用。由于模拟试样内外温度的差异使得横截面内存在温度梯度,导致了不同温度区域的应力重新分布,在高温区域应力随时间降低,此区域的应变却大于低温区域。本文的方法对于镍基单晶冷却叶片及其他高温结构的设计与分析具有参考意义。
关键词:
固体力学;镍基单晶合金;疲劳蠕变交互作用;温度梯度;有限元分析
YU Qingmin*
(
School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi'an 710072; )
Abstract:
In this paper, the crystal plastic model coupled with kinematic hardening is developed to study the creep-fatigue interaction of single crystal superalloys. The finite element method is introduced to simulate the creep-fatigue interaction under anisothermal condition. The results show that the constitutive model with kinematic hardening can be used to study the fatigue-creep behavior of single crystal. There are obvious gradient due to the effect of anisothermal, and the stress is re-distributed at different temperature zone. Although the stress at higher temperature zone is decreasing with time, the strain at higher temperature zone is larger than that at lower temperature zone. The method can be applied in the design and analysis of the cooled blade and other high temperature components made of single crystal superalloys.
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