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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2018, Vol. 39 ›› Issue (3): 421535-421535.doi: 10.7527/S1000-6893.2017.421535

• Material Engineering and Mechanical Manufacturing • Previous Articles     Next Articles

Crack monitoring based on high durability film sensor in coupled environment

CUI Ronghong1, LIU Kai1, HOU Bo2, TAN Xiangfei1, HE Yuting1   

  1. 1. Aeronautics and Astronautics Engineering College, Air Force Engineering University, Xi'an 710038, China;
    2. Army Aviation Research Institute, Beijing 101121, China
  • Received:2017-06-20 Revised:2017-10-09 Online:2018-03-15 Published:2017-10-19
  • Supported by:
    National Natural Science Foundation of China (51201182)

Abstract: Most of existing crack monitoring methods have disadvantages in terms of poor durability and high false alarm probability. A scheme for improving the durability of the Physical Vapor Deposition (PVD) film sensor is proposed, and the performance of crack monitoring of the sensor in coupled environment is tested. First, Cu Is selected as the depositing material of the conductive sensing layer to make the best durability of the film sensor, and the ion plating AlN film and coated 705 silica gel are used to package the PVD film sensor. Second, with comprehensive consideration of service environment, the periodic accelerated environment spectrum is compiled, and the packaged PVD film sensor deposited on the substrate is tested in this spectrum. Finally, fatigue crack monitoring of the post-environment-test specimen is carried out, and the results of film sensor monitoring are compared with those observed from the microscope. Comparison results show that the film sensor is able to endure the test of 1000 h in adverse environment conditions, so it has relatively high durability and stability. The post-environment-test film sensor is sensitive to crack development, and the result of PVD film sensor monitoring consists with measured crack development information. The potential monitoring signal of the PVD sensor can be used as the judging criteria of the crack stage and structural damage extent, and the PVD film sensor can realize quantitative monitoring of the fatigue crack with precision reaching 1 mm.

Key words: crack monitoring, film sensor, coupled environment, durability, accelerated test, fatigue damage

CLC Number: