航空发动机的安全可靠是影响飞机使用性能的关键，对叶片结构损伤的快速检测和性能评估具有重大现实意义。鉴于此，项目将重点针对我国具有重大战略意义的航空发动机叶片等复杂结构，通过研究功率超声波振动在复杂型面叶片内部的传播规律，分析超声振动与叶片结构损伤界面相互作用、摩擦生热及热传导等力-热耦合机理，突破功率超声激励加载方式及参数优化、热图序列特征提取、损伤表征和参数定量识别等基础理论和关键技术，实现叶片结构典型损伤的快速检测、有效表征和定量识别。在此基础上，融合损伤力学理论和热力耦合效应，分析叶片结构在疲劳载荷过程中基于能量耗散的热力参数和损伤参数演化机理，探索叶片损伤扩展演化规律，构建热力参数、损伤参数和剩余疲劳寿命关系模型，实现复杂型面叶片结构剩余疲劳寿命预测和评估。研究成果将为我国航空发动机叶片损伤的检测、表征、识别和评估提供快速高效的新型无损检测理论和方法，具有重要的理论意义和应用价值。

The safety and reliability of aero-engine is the key factor to affect the performance of aero-crafts, thus, it is of great practical significance to rapidly detect the damage and to evaluate the performance of blade structure. For this reason, this project mainly focuses on the aero-engine blade that is of great strategic significance to China. Firstly, the propagation of power ultrasonic vibration in the blade with complex profile is investigated, followed by the analysis of mechanical-thermal coupling mechanism, including the interaction between ultrasonic vibration and blade structure damage interface, friction induced heat and heat conduction. Then, the basic theory and key technology, including loading method of power ultrasonic, optimization of stimulation parameter, feature extraction of thermal image sequence, typical damage characterization and quantitative identification of damage parameter, are broken through to realize the rapid detection, effective characterization and quantitative identification of typical damage in blade structure. On this basis, in combination of damage mechanics theories and thermo-mechanical coupling effect, energy dissipation based on evolution mechanisms of energetics parameters and damage parameters of damaged blade structure are analyzed during fatigue loading to explore damage evolution law of blade. Thirdly, the quantitative relation model between energetics parameters, damage parameters and residual fatigue life is established to achieve the evaluation and prediction on residual fatigue life of aero-engine blade with complex profile. The project researches will provide high-efficient nondestructive detection theories and methods for the damage detection, characterization, identification and evaluation of aero-engine in China with important theoretical significance and application values.