航空科学技术2025，Vol.36Issue(4)：64-73,10.DOI:10.19452/j.issn1007-5453.2025.04.008
基于内聚力的薄膜热偶传感器脱层失效模型研究
Research on Failure Model of Delamination of Thin-Film Thermocouple Sensor Based on Cohesion Principle
胡听春 1孙宇锋2
作者信息
- 1. 中国航空研究院,北京 100012
- 2. 北京航空航天大学,北京 100191
- 折叠
摘要
Abstract
Engine turbine blades work in the harsh working environment of high temperature,high centrifugal,high vibration and air flow,and it is important to measure its surface temperature.However,under the blade operating conditions,the thin film sensor has serious problems of delamination failure.The delamination failure model of micro thin film thermocouple sensors used in aero engine turbine blade surface temperature measurement was studied by combining high temperature test and finite element analysis.Multilayer film thermocouple samples were prepared on metal substrate and subject to different high temperature loads to observe and analyze the phenomenon of film fracture and detachment.The strain field of turbine blade surface and thin film is simulated by finite element simulation software with the input of turbine blade working load.The cohesion theory is used to establish the failure model of film delamination.The interface shear failure and discovery failure functions are established respectively,as well as the competitive and coupled failure functions of the interface,and the main factors affecting the delamination length of the film interface and the film delamination are analyzed.The cohesion unit of the finite element simulation is used to simulate the delamination behavior of the interface.The study proposed a coupled failure model mechanism of thin film penetrating cracks accompanied by delamination,supporting the design optimization of support sensors.关键词
薄膜热电偶/涡轮叶片/脱层失效/内聚力/有限元/高温热冲击Key words
thin-film thermocouple/turbine blades/delamination/cohesive principle/finite element simulation/thermal shock分类
机械工程引用本文复制引用
胡听春,孙宇锋..基于内聚力的薄膜热偶传感器脱层失效模型研究[J].航空科学技术,2025,36(4):64-73,10.
