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1. An evaluation of convergence criteria on digital image correlation | |||
Pan Bing | |||
Mechanics 15 December 2013 | |||
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Abstract:A fast, robust and accurate digital image correlation (DIC) method, which uses an efficient inverse compositional matching Gauss-Newton (IC-GN) algorithm, was recently proposed for full-field deformation measurement. As an iterative local optimization algorithm, IC-GN algorithm iteratively solves for the incremental warp assumed on the reference subset until the preset convergence criteria are satisfied. In the literature, different convergence criteria have been set for iterative optimization algorithms. However, on the one hand, stringent convergence criteria lead to increased number of iterations and lessen the computational efficiency. On the other hand, too loose convergence conditions enhance the computational efficiency but may decrease the registration accuracy. Understanding the impact of prescribed convergence criteria on DIC measurement and how to choose proper convergence criteria are therefore fundamental problems in realizing high-efficiency yet high-accuracy DIC analysis. In this paper, the convergence characteristics of IC-GN algorithm are investigated using real experimental images. The effect of various convergence criteria on the efficiency and accuracy of IC-GN algorithm are carefully examined. Recommendations are given to select proper convergence criteria for more efficient implement of IC-GN algorithm. | |||
TO cite this article:Pan Bing. An evaluation of convergence criteria on digital image correlation[OL].[15 December 2013] http://en.paper.edu.cn/en_releasepaper/content/4575332 |
2. Acoustic emission analysis on tensile failure of air plasma-sprayed thermal barrier coatings | |||
Yao Wangbin,Dai Cuiying,Mao Weiguo,Lu Chunsheng,Zhou Yichun | |||
Mechanics 04 December 2011 | |||
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Abstract:An acoustic emission technique was used to monitor the cracking behavior and fracture process of thermal barrier coatings subjected to tensile loading. Acoustic emission signals were extracted and preformed by fast Fourier transform, and their corresponding characteristic frequency spectrums and dominant bands were obtained to reveal fracture modes. Three different characteristic frequency bands were confirmed, corresponding to substrate deformation, surface vertical crack and interface delamination, with the aid of scanning electronic microscopy observations. A map of the tensile failure mechanism of air plasma-sprayed thermal barrier coatings was established. Using experimental data, the fracture strength and interface shear strength were estimated as 45.73 ± 3.92 MPa and 20.51 ± 1.74 MPa, respectively, which are well agreement with available results.. | |||
TO cite this article:Yao Wangbin,Dai Cuiying,Mao Weiguo, et al. Acoustic emission analysis on tensile failure of air plasma-sprayed thermal barrier coatings[OL].[ 4 December 2011] http://en.paper.edu.cn/en_releasepaper/content/4453646 |
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