ISSN: 1945-7553
CODEN: JTEVAB
Published Online: 19 March 2010
Page Count: 6

Measurement of Micro Region Creep Deformation in the Multi-Layer Coating with Digital Speckle Correlation System

Chen, Jianjun
School of Mechanical and Power Engineering, East China Univ. of Science and Technology, Shanghai,

Zhang, Hongyu
School of Mechanical and Power Engineering, East China Univ. of Science and Technology, Shanghai,

Tu, Shantung
School of Mechanical and Power Engineering, East China Univ. of Science and Technology, Shanghai,

Xuan, Fuzhen
School of Mechanical and Power Engineering, East China Univ. of Science and Technology, Shanghai,

Wang, Zhengdong
School of Mechanical and Power Engineering, East China Univ. of Science and Technology, Shanghai,

(Received 19 August 2008; accepted 15 February 2010)

Abstract

A micro region measuring system has been developed to achieve the time-dependent deformation of multi-layer coating at high temperature. The proposed system uses a long-distance microscope and digital speckle correlation method to evaluate the full creep strain fields, which is especially suited for the long-term measurement of the nonuniform deformation. The creep tension tests are performed to obtain the creep strain distribution and evolution inside the thermal barrier coating specimen. According to the deformation measured from different micro regions, we obtained some fundamental knowledge about the time-dependent behavior of the failure mechanism in multi-layer coatings. The accuracy of the new measuring system and the corresponding error analyses are also discussed in this paper.

Keywords:
creep strain measurement, micro region, image analysis, digital speckle, correlation method

Paper ID: JTE102024
DOI: 10.1520/JTE102024
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