基于微观特征定量辨识的加速有效性评估方法

开展加速试验已逐渐成为航空高性能结构（如涡轮叶片）性能分析与寿命管理的重要途径，然而对于加速试验结果的合理、有效评估成为了制约加速试验技术发展的难题。本文以现有物理机制方法为基础，通过构建微观结构特征与宏观性能之间的定量关系，提出基于微观特征定量辨识的加速有效性评估方法，对涡轮叶片加速损伤和失效机理进行系统阐释。结果表明：本文提出的评估方法克服了现有物理机制方法的主要缺点，使得评估结果更加准确可靠，对于提高航空高性能结构的性能分析与寿命预测的准确性具有重要的借鉴意义。

Accelerated effectiveness evaluation method based on quantitative identification of physical characteristics

Conducting accelerated test has gradually become an important way for performance analysis and life management of aviation high-performance structures (such as turbine blades). However, the reasonable and effective evaluation of accelerated test results has become a difficult problem restricting the development of accelerated test technology. Therefore, based on the existing physical mechanism methods, by constructing the quantitative relationship between microstructure characteristics and macro performance, this paper proposes an acceleration effectiveness evaluation method based on quantitative identification of micro characteristics, and systematically explains the acceleration damage and failure mechanism of turbine blades. This method uses a variety of advanced detection technologies to perform qualitative analysis and quantitative characterization of fracture morphologies, microstructures and element compositions, and takes the typical characteristics in field service as the comparison benchmark, which overcomes the main shortcomings of the existing physical mechanism methods and makes the evaluation results more accurate and reliable. The method proposed in this paper has important reference significance for improving the accuracy of performance analysis and life prediction of aviation high-performance structures.