论文部分内容阅读
单晶叶片技术是提高航空发动机及地面燃气轮机性能、寿命及可靠性的关键技术之一，但单晶材料机械、力学性能的各向异性特性制约了其发展和应用，对其工程应用及应用的理论基础提出了挑战。课题组开展了各向异性单晶叶片强度分析和寿命预测方面的一些研究工作。包括：建立并验证了弹塑性、蠕变滑移本构模型及蠕变持久寿命预测方法；进行了不同晶体取向DD3单晶在不同温度、不同速率或不同温度、不同应力水平下的拉伸试验及蠕变试验，这些实验数据及由其反映的单晶中、高温各向异性特性对单晶材料的应用具有重要意义。此外还进行了某种单晶叶片的实验研究。作为上述研究的应用，对某发动机单晶涡轮叶片进行了强度分析和寿命预测。本文这一部分介绍本构模型及应用，实验研究将在第II部分介绍。
Single crystal blade technology is one of the key technologies to improve the performance, life expectancy and reliability of aero-engine and ground-based gas turbines. However, the anisotropic mechanical and mechanical properties of single crystal materials constrain its development and application. The theoretical basis poses a challenge. The research group carried out some research work on anisotropy single crystal blade strength analysis and life prediction. Including: establishing and verifying the elastic-plastic creep slippage constitutive model and the prediction method of creep permanent life; conducting the tensile test of DD3 single crystals with different crystal orientation at different temperatures, different velocities or different temperatures and different stress levels And creep test, these experimental data and the single-crystal, high-temperature anisotropy characteristics reflected by them are of great significance to the application of single crystal materials. In addition, some single-crystal leaf experiments were also conducted. As an application of the above research, strength analysis and life prediction of an engine single crystal turbine blade were carried out. This section of this article introduces the constitutive model and its application. The experimental study will be covered in Section II.